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Add Corporate Network Example

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teastep 2003-07-16 18:59:33 +00:00
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -29,15 +29,15 @@
</h3> </h3>
<h3><font color="#ff6633">Warning: </font>The 6to4 tunnel feature of Shorewall <h3><font color="#ff6633">Warning: </font>The 6to4 tunnel feature of Shorewall
only facilitates IPv6 over IPv4 tunneling. It does not provide any IPv6 security only facilitates IPv6 over IPv4 tunneling. It does not provide any IPv6
measures.</h3> security measures.</h3>
<p>6to4 tunneling with Shorewall can be used to connect your IPv6 network <p>6to4 tunneling with Shorewall can be used to connect your IPv6 network
to another IPv6 network over an IPv4 infrastructure</p> to another IPv6 network over an IPv4 infrastructure</p>
<p>More information on Linux and IPv6 can be found in the <a <p>More information on Linux and IPv6 can be found in the <a
href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO">Linux IPv6 HOWTO</a>. Details href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO">Linux IPv6 HOWTO</a>.
on how to setup a 6to4 tunnels are described in the section <a Details on how to setup a 6to4 tunnels are described in the section <a
href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/configuring-ipv6to4-tunnels.html">Setup href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/configuring-ipv6to4-tunnels.html">Setup
of 6to4 tunnels</a>.</p> of 6to4 tunnels</a>.</p>
@ -50,17 +50,17 @@ on how to setup a 6to4 tunnels are described in the section <a
</p> </p>
<p align="left">We want systems in the 2002:100:333::/64 subnetwork to be <p align="left">We want systems in the 2002:100:333::/64 subnetwork to be
able to communicate with the systems in the 2002:488:999::/64 network. This able to communicate with the systems in the 2002:488:999::/64 network. This
is accomplished through use of the /etc/shorewall/tunnels file and the "ip" is accomplished through use of the /etc/shorewall/tunnels file and the "ip"
utility for network interface and routing configuration.</p> utility for network interface and routing configuration.</p>
<p align="left">Unlike GRE and IPIP tunneling, the /etc/shorewall/policy, <p align="left">Unlike GRE and IPIP tunneling, the /etc/shorewall/policy,
/etc/shorewall/interfaces and /etc/shorewall/zones files are not used. There /etc/shorewall/interfaces and /etc/shorewall/zones files are not used. There
is no need to declare a zone to represent the remote IPv6 network. This remote is no need to declare a zone to represent the remote IPv6 network. This
network is not visible on IPv4 interfaces and to iptables. All that is visible remote network is not visible on IPv4 interfaces and to iptables. All that
on the IPv4 level is an IPv4 stream which contains IPv6 traffic. Separate is visible on the IPv4 level is an IPv4 stream which contains IPv6 traffic.
IPv6 interfaces and ip6tables rules need to be defined to handle this traffic. Separate IPv6 interfaces and ip6tables rules need to be defined to handle
</p> this traffic. </p>
<p align="left">In /etc/shorewall/tunnels on system A, we need the following:</p> <p align="left">In /etc/shorewall/tunnels on system A, we need the following:</p>
@ -128,8 +128,8 @@ IPv6 interfaces and ip6tables rules need to be defined to handle this traffic.
</blockquote> </blockquote>
<p>On both systems, restart Shorewall and issue the configuration commands <p>On both systems, restart Shorewall and issue the configuration commands
as listed above. The systems in both IPv6 subnetworks can now talk to each as listed above. The systems in both IPv6 subnetworks can now talk to each
other using IPv6.</p> other using IPv6.</p>
<p><font size="2">Updated 5/18/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2">Updated 5/18/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
@ -139,5 +139,6 @@ other using IPv6.</p>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1252">
<title>Corporate Shorewall Configuration</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta name="Microsoft Theme" content="none">
<meta name="author" content="Graeme Boyle">
</head>
<body>
<script><!--
function PrivoxyWindowOpen(){return(null);}
//--></script>
<table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#3366ff" height="90">
<tbody>
<tr>
<td width="100%">
<h1 align="center"><font color="#ffffff">Multiple IPs with DMZ and
Internal Servers</font></h1>
</td>
</tr>
</tbody>
</table>
<blockquote> </blockquote>
<h1>Corporate Network</h1>
<p><font size="4" color="#ff0000"><b>Notes</b></font><big><font
color="#ff0000"><b>:</b></font></big></p>
<blockquote>
<ul>
<li><b>This configuration is used on a corporate network that
has a Linux (RedHat 8.0) server with three interfaces, running Shorewall
1.4.5 release,</b></li>
<li><b>Make sure you know what public IP addresses are currently
being used and verify these </b><i>before</i><b> starting.</b></li>
<li><b>Verify you DNS settings </b><i>before</i><b> starting any
Shorewall configuration especially if you have split DNS.</b></li>
<li><b>System names and Internet IP addresses have been changed
to protect the innocent.</b></li>
</ul>
<p><big><font color="#ff0000"><b>Warning: </b></font><b><small>This configuration
uses a combination of Static NAT and Proxy ARP. This is generally not
relevant to a simple configuration with a single public IP address.</small></b></big><big><b><small>
If you have just a single public IP address, most of what you see
here won't apply to your setup so beware of copying parts of this
configuration and expecting them to work for you. What you copy may
or may not work in your configuration.<br>
</small></b></big><br>
</p>
<p> I have a T1 with 64 static IP addresses (63.123.106.65-127/26). The
internet is connected to eth0. The local network is connected via eth1
(10.10.0.0/22) and the DMZ is connected to eth2 (192.168.21.0/24). I
have an IPSec tunnel connecting our offices in Germany to our offices
in the US. I host two Microsoft Exchange servers for two different companies
behind the firewall hence, the two Exchange servers in the diagram below.</p>
<p> Summary:<br>
</p>
<ul>
<li>SNAT for all systems connected to the LAN
- Internal addresses 10.10.x.x to external address 63.123.106.127.</li>
<li>Static NAT for <i>Polaris</i> (Exchange Server
#2). Internal address 10.10.1.8 and external address 63.123.106.70.</li>
<li>Static NAT for <i>Sims</i> (Inventory Management server).
Internal address 10.10.1.56 and external address 63.123.106.75.<br>
</li>
<li>Static NAT for <i>Project</i> (Project Web
Server). Internal address 10.10.1.55 and external
address 63.123.106.84.</li>
<li>Static NAT for <i>Fortress</i> (Exchange
Server). Internal address 10.10.1.252 and external
address 63.123.106.93.</li>
<li>Static NAT for <i>BBSRV</i> (Blackberry Server).
Internal address 10.10.1.230 and external address
63.123.106.97.</li>
<li>Static NAT for <i>Intweb</i> (Intranet Web
Server). Internal address 10.10.1.60 and external
address 63.123.106.115.</li>
</ul>
<p> The firewall runs on a 2Gb, Dual PIV/2.8GHz, Intel motherboard with
RH8.0.</p>
<p> The Firewall is also a proxy server running Privoxy 3.0.</p>
<p> The single system in the DMZ (address 63.123.106.80) runs sendmail,
imap, pop3, DNS, a Web server (Apache) and an FTP server (vsFTPd 1.1.0).
That server is managed through Proxy ARP.</p>
<p> All administration and publishing is done using ssh/scp. I have X installed
on the firewall and the system in the DMZ. X applications tunnel
through SSH to Hummingbird Exceed running on a PC located in the LAN.
Access to the firewall using SSH is restricted to systems in the LAN, DMZ
or the system Kaos which is on the Internet and managed by me.</p>
<p align="center"> <img border="0"
src="images/CorpNetwork.gif" width="770" height="1000"
alt="(Corporate Network Diagram)">
</p>
<p> </p>
<p>The Ethernet 0 interface in the Server is configured with IP
address 63.123.106.68, netmask 255.255.255.192. The server's default
gateway is 63.123.106.65, the Router connected to my network and
the ISP. This is the same default gateway used by the firewall
itself. On the firewall, Shorewall automatically
adds a host route to 63.123.106.80 through Ethernet
2 (192.168.21.1) because of the entry in
/etc/shorewall/proxyarp (see below). I modified the start, stop and
init scripts to include the fixes suggested when having an IPSec tunnel.</p>
<p><b>Some Mistakes I Made:</b></p>
<p>Yes, believe it or not, I made some really basic mistakes when building
this firewall. Firstly, I had the new firewall setup in parallel with
the old firewall so that there was no interruption of service to my users.
During my out-bound testing, I set up systems on the LAN to utilize the
firewall which worked fine. When testing my NAT connections, from the
outside, these would fail and I could not understand why. Eventually,
I changed the default route on the internal system I was trying to access,
to point to the new firewall and "bingo", everything worked as expected.
This oversight delayed my deployment by a couple of days not to mention
level of frustration it produced. </p>
<p>Another problem that I encountered was in setting up the Proxyarp system
in the DMZ. Initially I forgot to remove the entry for the eth2 from
the /etc/shorewall/masq file. Once my file settings were correct, I started
verifying that the ARP caches on the firewall, as well as the outside
system "kaos", were showing the correct Ethernet MAC address. However,
in testing remote access, I could access the system in the DMZ only from
the firewall and LAN but not from the Internet. The message I received
was "connection denied" on all protocols. What I did not realize was that
a "helpful" administrator that had turned on an old system and assigned
the same address as the one I was using for Proxyarp without notifying
me. How did I work this out. I shutdown the system in the DMZ, rebooted
the router and flushed the ARP cache on the firewall and kaos. Then, from
kaos, I started pinging that IP address and checked the updated ARP cache
and lo-and-behold a different MAC address showed up. High levels of frustration
etc., etc. The administrator will <i>not</i> be doing that again! :-)</p>
<p><b>Lessons Learned:</b></p>
<ul>
<li>Read the documentation.</li>
<li>Draw your network topology before starting.</li>
<li>Understand what services you are going to allow in and out of
the firewall, whether they are TCP or UDP packets and make a note
of these port numbers.</li>
<li>Try to get quiet time to build the firewall - you need to focus
on the job at hand.</li>
<li>When asking for assistance, be honest and include as much detail
as requested. Don't try and hide IP addresses etc., you will probably
screw up the logs and make receiving assistance harder.</li>
<li>Read the documentation.</li>
</ul>
<p><b>Futures:</b></p>
<p>This is by no means the final configuration. In the near future, I will
be moving more systems from the LAN to the DMZ. I will also be watching
the logs for port scan programs etc. but, this should be standard security
maintenance.</p>
<p>Here are copies of my files. I have removed most of the internal
documentation for the purpose of this space however, my system still has
the original files with all the comments and I highly recommend you do
the same.</p>
</blockquote>
<h3>Shorewall.conf</h3>
<blockquote>
<pre>##############################################################################<br># /etc/shorewall/shorewall.conf V1.4 - Change the following variables to<br># match your setup<br>#<br># This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]<br>#<br># This file should be placed in /etc/shorewall<br>#<br># (c) 1999,2000,2001,2002,2003 - Tom Eastep (teastep@shorewall.net)<br>##############################################################################<br># L O G G I N G<br>##############################################################################<br>LOGFILE=/var/log/messages<br>LOGFORMAT="Shorewall:%s:%s:"<br>LOGRATE=<br>LOGBURST=<br>LOGUNCLEAN=info<br>BLACKLIST_LOGLEVEL=<br>LOGNEWNOTSYN=<br>MACLIST_LOG_LEVEL=info<br>TCP_FLAGS_LOG_LEVEL=debug<br>RFC1918_LOG_LEVEL=debug<br>PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin<br>SUBSYSLOCK=/var/lock/subsys/shorewall<br>STATEDIR=/var/lib/shorewall<br>MODULESDIR=<br>FW=fw<br>NAT_ENABLED=Yes<br>MANGLE_ENABLED=Yes<br>IP_FORWARDING=On<br>ADD_IP_ALIASES=Yes<br>ADD_SNAT_ALIASES=Yes<br>TC_ENABLED=Yes<br>CLEAR_TC=No<br>MARK_IN_FORWARD_CHAIN=No<br>CLAMPMSS=No<br>ROUTE_FILTER=Yes<br>NAT_BEFORE_RULES=No<br>MULTIPORT=Yes<br>DETECT_DNAT_IPADDRS=Yes<br>MUTEX_TIMEOUT=60<br>NEWNOTSYN=Yes<br>BLACKLIST_DISPOSITION=DROP<br>MACLIST_DISPOSITION=REJECT<br>TCP_FLAGS_DISPOSITION=DROP<br>#LAST LINE -- DO NOT REMOVE<br><br></pre>
</blockquote>
<h3>Zones File</h3>
<blockquote>
<pre><font face="Courier">#<br># Shorewall 1.4 -- Sample Zone File For Two Interfaces<br># /etc/shorewall/zones<br>#<br># This file determines your network zones. Columns are:<br>#<br># ZONE Short name of the zone<br># DISPLAY Display name of the zone<br># COMMENTS Comments about the zone<br>#<br>#ZONE DISPLAY COMMENTS<br>net Net Internet<br>loc Local Local Networks<br>dmz DMZ Demilitarized Zone<br>vpn1 VPN1 VPN to Germany<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</font><font
face="Courier" size="2"><br></font></pre>
</blockquote>
<h3>Interfaces File: </h3>
<blockquote>
<p> ##############################################################################<br>
#ZONE INTERFACE BROADCAST OPTIONS<br>
net eth0 62.123.106.127 routefilter,norfc1918,blacklist,tcpflags<br>
loc eth1 detect dhcp,routefilter<br>
dmz eth2 detect<br>
vpn1 ipsec0<br>
#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE
</p>
</blockquote>
<h3>Routestopped File:</h3>
<blockquote>
<pre><font face="Courier">#INTERFACE HOST(S)<br>eth1 -<br>eth2 -<br>#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</font><font
face="Courier" size="2"> </font></pre>
</blockquote>
<h3>Policy File:</h3>
<blockquote>
<pre>###############################################################################<br>#SOURCE DEST POLICY LOG LEVEL LIMIT:BURST<br>loc net ACCEPT<br>loc fw ACCEPT<br>loc dmz ACCEPT<br># If you want open access to the Internet from your Firewall <br># remove the comment from the following line.<br>fw net ACCEPT<br>fw loc ACCEPT<br>fw dmz ACCEPT<br>dmz fw ACCEPT<br>dmz loc ACCEPT<br>dmz net ACCEPT<br># <br># Adding VPN Access<br>loc vpn1 ACCEPT<br>dmz vpn1 ACCEPT<br>fw vpn1 ACCEPT<br>vpn1 loc ACCEPT<br>vpn1 dmz ACCEPT<br>vpn1 fw ACCEPT<br>#<br>net all DROP info<br>all all REJECT info<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE<br></pre>
</blockquote>
<h3>Masq File: </h3>
<blockquote>
<pre>#INTERFACE SUBNET ADDRESS<br>eth0 eth1 163.123.106.126<br>#<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE<br></pre>
</blockquote>
<h3>NAT File: </h3>
<blockquote>
<pre>#EXTERNAL INTERFACE INTERNAL ALL INTERFACES LOCAL<br>#<br># Intranet Web Server<br>63.123.106.115 eth0:0 10.10.1.60 No No<br>#<br># Project Web Server<br>63.123.106.84 eth0:1 10.10.1.55 No No<br>#<br># Blackberry Server<br>63.123.106.97 eth0:2 10.10.1.55 No No<br>#<br># Corporate Mail Server<br>63.123.106.93 eth0:3 10.10.1.252 No No<br>#<br># Second Corp Mail Server<br>63.123.106.70 eth0:4 10.10.1.8 No No<br>#<br># Sims Server<br>63.123.106.75 eth0:5 10.10.1.56 No No<br>#<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE<br></pre>
</blockquote>
<h3>Proxy ARP File:</h3>
<blockquote>
<pre><font face="Courier" size="2">#ADDRESS INTERFACE EXTERNAL HAVEROUTE<br>#<br># The Corporate email server in the DMZ<br>63.123.106.80 eth2 eth0 No<br>#<br>#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE </font></pre>
</blockquote>
<h3>Tunnels File:</h3>
<blockquote>
<pre># TYPE ZONE GATEWAY GATEWAY ZONE PORT<br>ipsec net 134.147.129.82<br>#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</pre>
</blockquote>
<h3>Rules File (The shell variables are set in /etc/shorewall/params):</h3>
<blockquote>
<pre>##############################################################################<br>#ACTION SOURCE DEST PROTO DEST SOURCE ORIGINAL<br># PORT PORT(S) DEST<br>#<br># Accept DNS connections from the firewall to the network<br>#<br>ACCEPT fw net tcp 53<br>ACCEPT fw net udp 53<br>#<br># Accept SSH from internet interface from kaos only<br>#<br>ACCEPT net:63.123.106.98 fw tcp 22<br>#<br># Accept connections from the local network for administration <br>#<br>ACCEPT loc fw tcp 20:22<br>ACCEPT loc net tcp 22<br>ACCEPT loc fw tcp 53<br>ACCEPT loc fw udp 53<br>ACCEPT loc net tcp 53<br>ACCEPT loc net udp 53<br>#<br># Allow Ping To And From Firewall<br>#<br>ACCEPT loc fw icmp 8<br>ACCEPT loc dmz icmp 8<br>ACCEPT loc net icmp 8<br>ACCEPT dmz fw icmp 8<br>ACCEPT dmz loc icmp 8<br>ACCEPT dmz net icmp 8<br>DROP net fw icmp 8<br>DROP net loc icmp 8<br>DROP net dmz icmp 8<br>ACCEPT fw loc icmp 8<br>ACCEPT fw dmz icmp 8<br>DROP fw net icmp 8<br>#<br># Accept proxy web connections from the inside<br>#<br>ACCEPT loc fw tcp 8118<br>#<br># Forward PcAnywhere, Oracle and Web traffic from outside to the Demo systems<br># From a specific IP Address on the Internet.<br># <br># ACCEPT net:207.65.110.10 loc:10.10.3.151 tcp 1521,http<br># ACCEPT net:207.65.110.10 loc:10.10.2.32 tcp 5631:5632<br>#<br># Intranet web server<br>ACCEPT net loc:10.10.1.60 tcp 443<br>ACCEPT dmz loc:10.10.1.60 tcp 443<br>#<br># Projects web server<br>ACCEPT net loc:10.10.1.55 tcp 80<br>ACCEPT dmz loc:10.10.1.55 tcp 80<br># <br># Blackberry Server<br>ACCEPT net loc:10.10.1.230 tcp 3101<br>#<br># Corporate Email Server<br>ACCEPT net loc:10.10.1.252 tcp 25,53,110,143,443<br>#<br># Corporate #2 Email Server<br>ACCEPT net loc:10.10.1.8 tcp 25,80,110,443<br>#<br># Sims Server<br>ACCEPT net loc:10.10.1.56 tcp 80,443<br>ACCEPT net loc:10.10.1.56 tcp 7001:7002<br>ACCEPT net:63.83.198.0/24 loc:10.10.1.56 tcp 5631:5632<br>#<br># Access to DMZ<br>ACCEPT loc dmz udp 53,177<br>ACCEPT loc dmz tcp 80,25,53,22,143,443,993,20,110 -<br>ACCEPT net dmz udp 53<br>ACCEPT net dmz tcp 25,53,22,21,123<br>ACCEPT dmz net tcp 25,53,80,123,443,21,22<br>ACCEPT dmz net udp 53<br>#<br>#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE</pre>
</blockquote>
<h3>Start File:</h3>
<blockquote>
<pre>############################################################################<br># Shorewall 1.4 -- /etc/shorewall/start<br>#<br># Add commands below that you want to be executed after shorewall has<br># been started or restarted.<br>#<br>qt service ipsec start<br></pre>
</blockquote>
<h3>Stop File:</h3>
<blockquote>
<pre>############################################################################<br># Shorewall 1.4 -- /etc/shorewall/stop<br>#<br># Add commands below that you want to be executed at the beginning of a<br># "shorewall stop" command.<br>#<br>qt service ipsec stop</pre>
</blockquote>
<h3>Init File:</h3>
<blockquote>
<pre>############################################################################<br># Shorewall 1.4 -- /etc/shorewall/init<br>#<br># Add commands below that you want to be executed at the beginning of<br># a "shorewall start" or "shorewall restart" command.<br>#<br>qt service ipsec stop<br></pre>
</blockquote>
<p><font size="2">Last updated 7/16/2003</font>
<script><!--
function PrivoxyWindowOpen(a, b, c){return(window.open(a, b, c));}
//</script><br>
</p>
<p><small><a href="GnuCopyright.htm">Copyright 2003 Thomas M. Eastep and
Graeme Boyle</a></small><br>
</p>
<br>
</body>
</html>

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<html> <html>
<head> <head>
<title>Shorewall and ECN</title> <title>Shorewall and ECN</title>
<meta http-equiv="content-type" <meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1"> content="text/html; charset=ISO-8859-1">
<meta name="author" content="Tom Eastep"> <meta name="author" content="Tom Eastep">
</head> </head>
<body> <body>
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4" style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td <td
@ -20,41 +23,44 @@
</tbody> </tbody>
</table> </table>
<br> <br>
Explicit Congestion Notification (ECN) is described in RFC 3168 and is a Explicit Congestion Notification (ECN) is described in RFC 3168 and is a
proposed internet standard. Unfortunately, not all sites support ECN and proposed internet standard. Unfortunately, not all sites support ECN and when
when a TCP connection offering ECN is sent to sites that don't support it, a TCP connection offering ECN is sent to sites that don't support it, the
the result is often that the connection request is ignored.<br> result is often that the connection request is ignored.<br>
<br> <br>
To allow ECN to be used, Shorewall allows you to enable ECN on your Linux To allow ECN to be used, Shorewall allows you to enable ECN on your Linux
systems then disable it in your firewall when the destination matches a list systems then disable it in your firewall when the destination matches a list
that you create (the /etc/shorewall/ecn file).<br> that you create (the /etc/shorewall/ecn file).<br>
<br> <br>
You enable ECN by<br> You enable ECN by<br>
<br> <br>
<blockquote> <blockquote>
<pre><b><font color="#009900">echo 1 &gt; /proc/sys/net/ipv4/tcp_ecn</font></b></pre> <pre><b><font color="#009900">echo 1 &gt; /proc/sys/net/ipv4/tcp_ecn</font></b></pre>
</blockquote> </blockquote>
You must arrange for that command to be executed at system boot. Most distributions You must arrange for that command to be executed at system boot. Most distributions
have a method for doing that -- on RedHat, you make an entry in /etc/sysctl.conf.<br> have a method for doing that -- on RedHat, you make an entry in /etc/sysctl.conf.<br>
<br> <br>
<blockquote> <blockquote>
<pre><b><font color="#009900">net.ipv4.tcp_ecn = 1<br><br></font></b></pre> <pre><b><font color="#009900">net.ipv4.tcp_ecn = 1<br><br></font></b></pre>
</blockquote> </blockquote>
Entries in /etc/shorewall/ecn have two columns as follows:<br> Entries in /etc/shorewall/ecn have two columns as follows:<br>
<br> <br>
INTERFACE&nbsp;&nbsp;&nbsp; - The name of an interface on your system<br> INTERFACE&nbsp;&nbsp;&nbsp; - The name of an interface on your system<br>
<br> <br>
HOST(S)&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; - An address (host or subnet) HOST(S)&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; - An address (host or subnet)
of a system or group of systems accessed through the &nbsp;interface in the of a system or group of systems accessed through the &nbsp;interface in the
first column. You may include a comma-separated list of such addresses in first column. You may include a comma-separated list of such addresses in
this column. <br> this column. <br>
<br> <br>
Example: Your external interface is eth0 and you want to disable ECN for Example: Your external interface is eth0 and you want to disable ECN for
tcp connections to 192.0.2.0/24:<br> tcp connections to 192.0.2.0/24:<br>
<br> <br>
In /etc/shorewall/ecn:<br> In /etc/shorewall/ecn:<br>
<br> <br>
<blockquote> <blockquote>
<table cellpadding="2" cellspacing="0" border="1"> <table cellpadding="2" cellspacing="0" border="1">
<tbody> <tbody>
@ -70,14 +76,16 @@ In /etc/shorewall/ecn:<br>
<td valign="top">192.0.2.0/24<br> <td valign="top">192.0.2.0/24<br>
</td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<br> <br>
</blockquote> </blockquote>
<font size="2">Last updated 3/28/2003 - <a href="support.htm">Tom Eastep</a></font> <font size="2">Last updated 3/28/2003 - <a href="support.htm">Tom Eastep</a></font>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font <p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
</body> </body>
</html> </html>

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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -26,11 +26,13 @@
</table> </table>
<h3><font color="#ff6633"></font></h3> <h3><font color="#ff6633"></font></h3>
<h1>REPORTING A PROBLEM OR ASKING FOR HELP? If you haven't already, please <h1>REPORTING A PROBLEM OR ASKING FOR HELP? If you haven't already, please
read the <a href="support.htm">Shorewall Support Guide</a>.</h1> read the <a href="support.htm">Shorewall Support Guide</a>.</h1>
<p><a href="http://www.developercube.com/forum/index.php?c=8">Shorewall Support <p><a href="http://www.developercube.com/forum/index.php?c=8">Shorewall Support
Forum</a><br> Forum</a><br>
</p> </p>
<p><font size="2">Updated 3/6/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2">Updated 3/6/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
@ -38,5 +40,6 @@ Forum</a><br>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2003 Thomas M. Eastep.</font></a></p> size="2">2003 Thomas M. Eastep.</font></a></p>
<br> <br>
<br>
</body> </body>
</html> </html>

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta http-equiv="Content-Language" content="en-us">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<title>Copyright</title>
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1252">
<title>Copyright</title>
</head> </head>
<body>
<body> <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h2 align="center"><font color="#FFFFFF">GNU Free Documentation License</font></h2> <h2 align="center"><font color="#ffffff">GNU Free Documentation License</font></h2>
</td> </td>
</tr> </tr>
</tbody>
</table> </table>
<p>Version 1.1, March 2000 </p> <p>Version 1.1, March 2000 </p>
<pre>Copyright (C) 2000 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA <pre>Copyright (C) 2000 Free Software Foundation, Inc.<br>59 Temple Place, Suite 330, Boston, MA 02111-1307 USA<br>Everyone is permitted to copy and distribute verbatim copies<br>of this license document, but changing it is not allowed.<br></pre>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
</pre>
<p><strong>0. PREAMBLE</strong> </p> <p><strong>0. PREAMBLE</strong> </p>
<p>The purpose of this License is to make a manual, textbook, or other written <p>The purpose of this License is to make a manual, textbook, or other written
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<p>This License is a kind of &quot;copyleft&quot;, which means that derivative works of
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<p>We have designed this License in order to use it for manuals for free free software. </p>
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<p><strong>1. APPLICABILITY AND DEFINITIONS</strong> </p> <p><strong>1. APPLICABILITY AND DEFINITIONS</strong> </p>
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or authors of the Document to the Document's overall subject (or to related
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<p>The &quot;Invariant Sections&quot; are certain Secondary Sections whose titles are
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is released under this License. </p> <p>The "Cover Texts" are certain short passages of text that are listed,
<p>A &quot;Transparent&quot; copy of the Document means a machine-readable copy, as Front-Cover Texts or Back-Cover Texts, in the notice that says that the
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<p>Examples of suitable formats for Transparent copies include plain ASCII <p>Examples of suitable formats for Transparent copies include plain ASCII
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only. </p> purposes only. </p>
<p>The &quot;Title Page&quot; means, for a printed book, the title page itself, plus such
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text. </p>
<p><strong>2. VERBATIM COPYING</strong> </p> <p><strong>2. VERBATIM COPYING</strong> </p>
<p>You may copy and distribute the Document in any medium, either commercially <p>You may copy and distribute the Document in any medium, either commercially
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<p>You may also lend copies, under the same conditions stated above, and
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<p><strong>3. COPYING IN QUANTITY</strong> </p> <p><strong>3. COPYING IN QUANTITY</strong> </p>
<p>If you publish printed copies of the Document numbering more than 100, and
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<p>If the required texts for either cover are too voluminous to fit legibly,
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<p>If you publish or distribute Opaque copies of the Document numbering more <p>If you publish or distribute Opaque copies of the Document numbering more
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<p><strong>4. MODIFICATIONS</strong> </p> <p><strong>4. MODIFICATIONS</strong> </p>
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conditions of sections 2 and 3 above, provided that you release the Modified conditions of sections 2 and 3 above, provided that you release the Modified
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Version to whoever possesses a copy of it. In addition, you must do these things Modified Version to whoever possesses a copy of it. In addition, you must
in the Modified Version: </p> do these things in the Modified Version: </p>
<p>&nbsp;</p>
<p> </p>
<ul> <ul>
<li><strong>A.</strong> Use in the Title Page (and on the covers, if any) a <li><strong>A.</strong> Use in the Title Page (and on the covers, if any)
title distinct from that of the Document, and from those of previous versions a title distinct from that of the Document, and from those of previous
(which should, if there were any, be listed in the History section of the versions (which should, if there were any, be listed in the History section
Document). You may use the same title as a previous version if the original of the Document). You may use the same title as a previous version if the
publisher of that version gives permission. </li> original publisher of that version gives permission. </li>
<li><strong>B.</strong> List on the Title Page, as authors, one or more <li><strong>B.</strong> List on the Title Page, as authors, one or more
persons or entities responsible for authorship of the modifications in the persons or entities responsible for authorship of the modifications in
Modified Version, together with at least five of the principal authors of the the Modified Version, together with at least five of the principal authors
Document (all of its principal authors, if it has less than five). </li> of the Document (all of its principal authors, if it has less than five).
<li><strong>C.</strong> State on the Title page the name of the publisher of </li>
the Modified Version, as the publisher. </li> <li><strong>C.</strong> State on the Title page the name of the publisher
of the Modified Version, as the publisher. </li>
<li><strong>D.</strong> Preserve all the copyright notices of the Document. <li><strong>D.</strong> Preserve all the copyright notices of the Document.
</li> </li>
<li><strong>E.</strong> Add an appropriate copyright notice for your <li><strong>E.</strong> Add an appropriate copyright notice for your
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notice. </li> of Invariant Sections and required Cover Texts given in the Document's
license notice. </li>
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<li><strong>I.</strong> Preserve the section entitled &quot;History&quot;, and its <li><strong>I.</strong> Preserve the section entitled "History", and its
title, and add to it an item stating at least the title, year, new authors, title, and add to it an item stating at least the title, year, new authors,
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on. These may be placed in the &quot;History&quot; section. You may omit a network it was based on. These may be placed in the "History" section. You may
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itself, or if the original publisher of the version it refers to gives before the Document itself, or if the original publisher of the version
permission. </li> it refers to gives permission. </li>
<li><strong>K.</strong> In any section entitled &quot;Acknowledgements&quot; or <li><strong>K.</strong> In any section entitled "Acknowledgements" or
&quot;Dedications&quot;, preserve the section's title, and preserve in the section all "Dedications", preserve the section's title, and preserve in the section
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dedications given therein. </li> and/or dedications given therein. </li>
<li><strong>L.</strong> Preserve all the Invariant Sections of the Document, <li><strong>L.</strong> Preserve all the Invariant Sections of the Document,
unaltered in their text and in their titles. Section numbers or the equivalent unaltered in their text and in their titles. Section numbers or the equivalent
are not considered part of the section titles. </li> are not considered part of the section titles. </li>
<li><strong>M.</strong> Delete any section entitled &quot;Endorsements&quot;. Such a <li><strong>M.</strong> Delete any section entitled "Endorsements". Such
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<li><strong>N.</strong> Do not retitle any existing section as &quot;Endorsements&quot; <li><strong>N.</strong> Do not retitle any existing section as "Endorsements"
or to conflict in title with any Invariant Section. </li> or to conflict in title with any Invariant Section. </li>
</ul> </ul>
<p>If the Modified Version includes new front-matter sections or appendices that
qualify as Secondary Sections and contain no material copied from the Document, <p>If the Modified Version includes new front-matter sections or appendices
you may at your option designate some or all of these sections as invariant. To that qualify as Secondary Sections and contain no material copied from the
do this, add their titles to the list of Invariant Sections in the Modified Document, you may at your option designate some or all of these sections
Version's license notice. These titles must be distinct from any other section as invariant. To do this, add their titles to the list of Invariant Sections
titles. </p> in the Modified Version's license notice. These titles must be distinct from
<p>You may add a section entitled &quot;Endorsements&quot;, provided it contains nothing any other section titles. </p>
<p>You may add a section entitled "Endorsements", provided it contains nothing
but endorsements of your Modified Version by various parties--for example, but endorsements of your Modified Version by various parties--for example,
statements of peer review or that the text has been approved by an organization statements of peer review or that the text has been approved by an organization
as the authoritative definition of a standard. </p> as the authoritative definition of a standard. </p>
<p>You may add a passage of up to five words as a Front-Cover Text, and a <p>You may add a passage of up to five words as a Front-Cover Text, and a
passage of up to 25 words as a Back-Cover Text, to the end of the list of Cover passage of up to 25 words as a Back-Cover Text, to the end of the list of
Texts in the Modified Version. Only one passage of Front-Cover Text and one of Cover Texts in the Modified Version. Only one passage of Front-Cover Text
Back-Cover Text may be added by (or through arrangements made by) any one and one of Back-Cover Text may be added by (or through arrangements made
entity. If the Document already includes a cover text for the same cover, by) any one entity. If the Document already includes a cover text for the
previously added by you or by arrangement made by the same entity you are acting same cover, previously added by you or by arrangement made by the same entity
on behalf of, you may not add another; but you may replace the old one, on you are acting on behalf of, you may not add another; but you may replace
explicit permission from the previous publisher that added the old one. </p> the old one, on explicit permission from the previous publisher that added
<p>The author(s) and publisher(s) of the Document do not by this License give the old one. </p>
permission to use their names for publicity for or to assert or imply
<p>The author(s) and publisher(s) of the Document do not by this License
give permission to use their names for publicity for or to assert or imply
endorsement of any Modified Version. </p> endorsement of any Modified Version. </p>
<p><strong>5. COMBINING DOCUMENTS</strong> </p> <p><strong>5. COMBINING DOCUMENTS</strong> </p>
<p>You may combine the Document with other documents released under this
License, under the terms defined in section 4 above for modified versions, <p>You may combine the Document with other documents released under this License,
provided that you include in the combination all of the Invariant Sections of under the terms defined in section 4 above for modified versions, provided
all of the original documents, unmodified, and list them all as Invariant that you include in the combination all of the Invariant Sections of all
Sections of your combined work in its license notice. </p> of the original documents, unmodified, and list them all as Invariant Sections
of your combined work in its license notice. </p>
<p>The combined work need only contain one copy of this License, and multiple <p>The combined work need only contain one copy of this License, and multiple
identical Invariant Sections may be replaced with a single copy. If there are identical Invariant Sections may be replaced with a single copy. If there
multiple Invariant Sections with the same name but different contents, make the are multiple Invariant Sections with the same name but different contents,
title of each such section unique by adding at the end of it, in parentheses, make the title of each such section unique by adding at the end of it, in
the name of the original author or publisher of that section if known, or else a parentheses, the name of the original author or publisher of that section
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Invariant Sections in the license notice of the combined work. </p> titles in the list of Invariant Sections in the license notice of the combined
<p>In the combination, you must combine any sections entitled &quot;History&quot; in the work. </p>
various original documents, forming one section entitled &quot;History&quot;; likewise
combine any sections entitled &quot;Acknowledgements&quot;, and any sections entitled <p>In the combination, you must combine any sections entitled "History" in
&quot;Dedications&quot;. You must delete all sections entitled &quot;Endorsements.&quot; </p> the various original documents, forming one section entitled "History"; likewise
combine any sections entitled "Acknowledgements", and any sections entitled
"Dedications". You must delete all sections entitled "Endorsements." </p>
<p><strong>6. COLLECTIONS OF DOCUMENTS</strong> </p> <p><strong>6. COLLECTIONS OF DOCUMENTS</strong> </p>
<p>You may make a collection consisting of the Document and other documents <p>You may make a collection consisting of the Document and other documents
released under this License, and replace the individual copies of this License released under this License, and replace the individual copies of this License
in the various documents with a single copy that is included in the collection, in the various documents with a single copy that is included in the collection,
provided that you follow the rules of this License for verbatim copying of each provided that you follow the rules of this License for verbatim copying of
of the documents in all other respects. </p> each of the documents in all other respects. </p>
<p>You may extract a single document from such a collection, and distribute it
individually under this License, provided you insert a copy of this License into <p>You may extract a single document from such a collection, and distribute
the extracted document, and follow this License in all other respects regarding it individually under this License, provided you insert a copy of this License
verbatim copying of that document. </p> into the extracted document, and follow this License in all other respects
regarding verbatim copying of that document. </p>
<p><strong>7. AGGREGATION WITH INDEPENDENT WORKS</strong> </p> <p><strong>7. AGGREGATION WITH INDEPENDENT WORKS</strong> </p>
<p>A compilation of the Document or its derivatives with other separate and <p>A compilation of the Document or its derivatives with other separate and
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provided no compilation copyright is claimed for the compilation. Such a no compilation copyright is claimed for the compilation. Such a compilation
compilation is called an &quot;aggregate&quot;, and this License does not apply to the is called an "aggregate", and this License does not apply to the other self-contained
other self-contained works thus compiled with the Document, on account of their works thus compiled with the Document, on account of their being thus compiled,
being thus compiled, if they are not themselves derivative works of the if they are not themselves derivative works of the Document. </p>
Document. </p>
<p>If the Cover Text requirement of section 3 is applicable to these copies of <p>If the Cover Text requirement of section 3 is applicable to these copies
the Document, then if the Document is less than one quarter of the entire of the Document, then if the Document is less than one quarter of the entire
aggregate, the Document's Cover Texts may be placed on covers that surround only aggregate, the Document's Cover Texts may be placed on covers that surround
the Document within the aggregate. Otherwise they must appear on covers around only the Document within the aggregate. Otherwise they must appear on covers
the whole aggregate. </p> around the whole aggregate. </p>
<p><strong>8. TRANSLATION</strong> </p> <p><strong>8. TRANSLATION</strong> </p>
<p>Translation is considered a kind of modification, so you may distribute <p>Translation is considered a kind of modification, so you may distribute
translations of the Document under the terms of section 4. Replacing Invariant translations of the Document under the terms of section 4. Replacing Invariant
Sections with translations requires special permission from their copyright Sections with translations requires special permission from their copyright
holders, but you may include translations of some or all Invariant Sections in holders, but you may include translations of some or all Invariant Sections
addition to the original versions of these Invariant Sections. You may include a in addition to the original versions of these Invariant Sections. You may
translation of this License provided that you also include the original English include a translation of this License provided that you also include the
version of this License. In case of a disagreement between the translation and original English version of this License. In case of a disagreement between
the original English version of this License, the original English version will the translation and the original English version of this License, the original
prevail. </p> English version will prevail. </p>
<p><strong>9. TERMINATION</strong> </p> <p><strong>9. TERMINATION</strong> </p>
<p>You may not copy, modify, sublicense, or distribute the Document except as
expressly provided for under this License. Any other attempt to copy, modify, <p>You may not copy, modify, sublicense, or distribute the Document except
sublicense or distribute the Document is void, and will automatically terminate as expressly provided for under this License. Any other attempt to copy,
your rights under this License. However, parties who have received copies, or modify, sublicense or distribute the Document is void, and will automatically
rights, from you under this License will not have their licenses terminated so terminate your rights under this License. However, parties who have received
long as such parties remain in full compliance. </p> copies, or rights, from you under this License will not have their licenses
terminated so long as such parties remain in full compliance. </p>
<p><strong>10. FUTURE REVISIONS OF THIS LICENSE</strong> </p> <p><strong>10. FUTURE REVISIONS OF THIS LICENSE</strong> </p>
<p>The Free Software Foundation may publish new, revised versions of the GNU
Free Documentation License from time to time. Such new versions will be similar
in spirit to the present version, but may differ in detail to address new
problems or concerns. See http://www.gnu.org/copyleft/. </p>
<p>Each version of the License is given a distinguishing version number. If the
Document specifies that a particular numbered version of this License &quot;or any
later version&quot; applies to it, you have the option of following the terms and
conditions either of that specified version or of any later version that has
been published (not as a draft) by the Free Software Foundation. If the Document
does not specify a version number of this License, you may choose any version
ever published (not as a draft) by the Free Software Foundation. </p>
<p align="left">&nbsp;</p>
<p>The Free Software Foundation may publish new, revised versions of the
GNU Free Documentation License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns. See http://www.gnu.org/copyleft/. </p>
<p>Each version of the License is given a distinguishing version number.
If the Document specifies that a particular numbered version of this License
"or any later version" applies to it, you have the option of following the
terms and conditions either of that specified version or of any later version
that has been published (not as a draft) by the Free Software Foundation.
If the Document does not specify a version number of this License, you may
choose any version ever published (not as a draft) by the Free Software Foundation.
</p>
<p align="left"> </p>
<br>
</body> </body>
</html> </html>

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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -43,7 +43,7 @@ directory (usually /usr/share/doc/shorewall-&lt;version&gt;/).</p>
<p align="center"> <img border="0" src="images/TwoNets1.png" width="745" <p align="center"> <img border="0" src="images/TwoNets1.png" width="745"
height="427"> height="427">
</p> </p>
<p align="left">We want systems in the 192.168.1.0/24 subnetwork to be able <p align="left">We want systems in the 192.168.1.0/24 subnetwork to be able
to communicate with the systems in the 10.0.0.0/8 network. This is accomplished to communicate with the systems in the 10.0.0.0/8 network. This is accomplished
@ -86,8 +86,8 @@ it in /etc/shorewall/zones on both systems as follows.</p>
</table> </table>
</blockquote> </blockquote>
<p align="left">On system A, the 10.0.0.0/8 will comprise the <b>vpn</b> <p align="left">On system A, the 10.0.0.0/8 will comprise the <b>vpn</b> zone.
zone. In /etc/shorewall/interfaces:</p> In /etc/shorewall/interfaces:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -205,8 +205,8 @@ zone. In /etc/shorewall/interfaces:</p>
are secured so that root can execute them. </p> are secured so that root can execute them. </p>
<p align="left"> You will need to allow traffic between the "vpn" zone and <p align="left"> You will need to allow traffic between the "vpn" zone and
the "loc" zone on both systems -- if you simply want to admit all the "loc" zone on both systems -- if you simply want to admit all traffic
traffic in both directions, you can use the policy file:</p> in both directions, you can use the policy file:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -234,9 +234,9 @@ traffic in both directions, you can use the policy file:</p>
</table> </table>
</blockquote> </blockquote>
<p>On both systems, restart Shorewall and run the modified tunnel script <p>On both systems, restart Shorewall and run the modified tunnel script with
with the "start" argument on each system. The systems in the two masqueraded the "start" argument on each system. The systems in the two masqueraded subnetworks
subnetworks can now talk to each other</p> can now talk to each other</p>
<p><font size="2">Updated 2/22/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2">Updated 2/22/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
@ -244,5 +244,6 @@ subnetworks can now talk to each other</p>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001, 2002, 2003Thomas M. Eastep.</font></a></p> size="2">2001, 2002, 2003Thomas M. Eastep.</font></a></p>
<br> <br>
<br>
</body> </body>
</html> </html>

92
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -34,9 +34,9 @@
FreeS/Wan on the same system unless you are prepared to suffer the consequences. FreeS/Wan on the same system unless you are prepared to suffer the consequences.
If you start or restart Shorewall with an IPSEC tunnel active, the proxied If you start or restart Shorewall with an IPSEC tunnel active, the proxied
IP addresses are mistakenly assigned to the IPSEC tunnel device (ipsecX) IP addresses are mistakenly assigned to the IPSEC tunnel device (ipsecX)
rather than to the interface that you specify in the INTERFACE column rather than to the interface that you specify in the INTERFACE column of
of /etc/shorewall/proxyarp. I haven't had the time to debug this problem /etc/shorewall/proxyarp. I haven't had the time to debug this problem so
so I can't say if it is a bug in the Kernel or in FreeS/Wan. </p> I can't say if it is a bug in the Kernel or in FreeS/Wan. </p>
<p>You <b>might</b> be able to work around this problem using the following <p>You <b>might</b> be able to work around this problem using the following
(I haven't tried it):</p> (I haven't tried it):</p>
@ -115,9 +115,9 @@ so I can't say if it is a bug in the Kernel or in FreeS/Wan.
</blockquote> </blockquote>
<p align="left"><b>Note: </b>If either of the endpoints is behind a NAT gateway <p align="left"><b>Note: </b>If either of the endpoints is behind a NAT gateway
then the tunnels file entry on the <u><b>other</b></u> endpoint should then the tunnels file entry on the <u><b>other</b></u> endpoint should specify
specify a tunnel type of <i>ipsecnat</i> rather than <i>ipsec</i> and the a tunnel type of <i>ipsecnat</i> rather than <i>ipsec</i> and the GATEWAY
GATEWAY address should specify the external address of the NAT gateway.<br> address should specify the external address of the NAT gateway.<br>
</p> </p>
<p align="left">You need to define a zone for the remote subnet or include <p align="left">You need to define a zone for the remote subnet or include
@ -195,14 +195,14 @@ created a zone called "vpn" to represent the remote subnet.</p>
</table> </table>
</blockquote> </blockquote>
<p align="left"> Once you have these entries in place, restart Shorewall (type <p align="left"> Once you have these entries in place, restart Shorewall
shorewall restart); you are now ready to configure the tunnel in <a (type shorewall restart); you are now ready to configure the tunnel in <a
href="http://www.xs4all.nl/%7Efreeswan/"> FreeS/WAN</a> .</p> href="http://www.xs4all.nl/%7Efreeswan/"> FreeS/WAN</a> .</p>
<h2><a name="VPNHub"></a>VPN Hub</h2> <h2><a name="VPNHub"></a>VPN Hub</h2>
Shorewall can be used in a VPN Hub environment where multiple remote networks Shorewall can be used in a VPN Hub environment where multiple remote networks
are connected to a gateway running Shorewall. This environment is shown in are connected to a gateway running Shorewall. This environment is shown
this diatram.<br> in this diatram.<br>
<div align="center"><img src="images/ThreeNets.png" <div align="center"><img src="images/ThreeNets.png"
alt="(Three networks linked with IPSEC)" width="750" height="781"> alt="(Three networks linked with IPSEC)" width="750" height="781">
@ -211,7 +211,7 @@ this diatram.<br>
<p align="left">We want systems in the 192.168.1.0/24 sub-network to be able <p align="left">We want systems in the 192.168.1.0/24 sub-network to be able
to communicate with systems in the 10.0.0.0/16 and 10.1.0.0/16 networks to communicate with systems in the 10.0.0.0/16 and 10.1.0.0/16 networks
and we want the 10.0.0.0/16 and 10.1.0.0/16 networks to be able to communicate.</p> and we want the 10.0.0.0/16 and 10.1.0.0/16 networks to be able to communicate.</p>
<p align="left">To make this work, we need to do several things:</p> <p align="left">To make this work, we need to do several things:</p>
@ -219,11 +219,11 @@ and we want the 10.0.0.0/16 and 10.1.0.0/16 networks to be able to communicate.<
(allow the ESP and AH protocols and UDP Port 500). </p> (allow the ESP and AH protocols and UDP Port 500). </p>
<p align="left">b) Allow traffic through the tunnels two/from the local zone <p align="left">b) Allow traffic through the tunnels two/from the local zone
(192.168.1.0/24).<br> (192.168.1.0/24).<br>
</p> </p>
<p align="left">c) Deny traffic through the tunnels between the two remote <p align="left">c) Deny traffic through the tunnels between the two remote
networks.<br> networks.<br>
</p> </p>
<p align="left">Opening the firewall for the IPSEC tunnels is accomplished <p align="left">Opening the firewall for the IPSEC tunnels is accomplished
@ -287,14 +287,14 @@ networks.<br>
<p align="left"></p> <p align="left"></p>
<p align="left"><b>Note: </b>If either of the endpoints is behind a NAT gateway <p align="left"><b>Note: </b>If either of the endpoints is behind a NAT gateway
then the tunnels file entry on the <u><b>other</b></u> endpoint should then the tunnels file entry on the <u><b>other</b></u> endpoint should specify
specify a tunnel type of <i>ipsecnat</i> rather than <i>ipsec<br> a tunnel type of <i>ipsecnat</i> rather than <i>ipsec<br>
</i> and the GATEWAY address should specify the external address of the </i> and the GATEWAY address should specify the external address of the
NAT gateway.<br> NAT gateway.<br>
</p> </p>
<p align="left">On each system, we will create a zone to represent the remote <p align="left">On each system, we will create a zone to represent the remote
networks. On System A:<br> networks. On System A:<br>
</p> </p>
<blockquote> <blockquote>
@ -345,7 +345,7 @@ networks. On System A:<br>
</blockquote> </blockquote>
<p align="left">At system A, ipsec0 represents two zones so we have the following <p align="left">At system A, ipsec0 represents two zones so we have the following
in /etc/shorewall/interfaces:</p> in /etc/shorewall/interfaces:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -370,7 +370,7 @@ in /etc/shorewall/interfaces:</p>
</blockquote> </blockquote>
<p align="left">The /etc/shorewall/hosts file on system A defines the two <p align="left">The /etc/shorewall/hosts file on system A defines the two
VPN zones:<br> VPN zones:<br>
</p> </p>
<blockquote> <blockquote>
@ -403,7 +403,7 @@ VPN zones:<br>
</blockquote> </blockquote>
<p align="left">At systems B and C, ipsec0 represents a single zone so we <p align="left">At systems B and C, ipsec0 represents a single zone so we
have the following in /etc/shorewall/interfaces:</p> have the following in /etc/shorewall/interfaces:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -426,11 +426,12 @@ have the following in /etc/shorewall/interfaces:</p>
</tbody> </tbody>
</table> </table>
<br> <br>
</blockquote> </blockquote>
<p align="left">On systems A, you will need to allow traffic between the "vpn1"
zone and the "loc" zone as well as between "vpn2" and the "loc" zone <p align="left">On systems A, you will need to allow traffic between the
-- if you simply want to admit all traffic in both directions, you "vpn1" zone and the "loc" zone as well as between "vpn2" and the
can use the following policy file entries on all three gateways:</p> "loc" zone -- if you simply want to admit all traffic in both directions,
you can use the following policy file entries on all three gateways:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -476,11 +477,12 @@ can use the following policy file entries on all three gateways:</p>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
<p align="left">On systems B and C, you will need to allow traffic between <p align="left">On systems B and C, you will need to allow traffic between
the "vpn" zone and the "loc" zone -- if you simply want to admit all the "vpn" zone and the "loc" zone -- if you simply want to admit
traffic in both directions, you can use the following policy file entries all traffic in both directions, you can use the following policy file
on all three gateways:</p> entries on all three gateways:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -509,12 +511,13 @@ on all three gateways:</p>
</blockquote> </blockquote>
<p align="left">Once you have the Shorewall entries added, restart Shorewall <p align="left">Once you have the Shorewall entries added, restart Shorewall
on each gateway (type shorewall restart); you are now ready to configure on each gateway (type shorewall restart); you are now ready to configure
the tunnels in <a href="http://www.xs4all.nl/%7Efreeswan/"> FreeS/WAN</a> the tunnels in <a href="http://www.xs4all.nl/%7Efreeswan/"> FreeS/WAN</a>
.</p> .</p>
Note that to allow traffic between the networks attached to systems B and Note that to allow traffic between the networks attached to systems B and
C, it is necessary to simply add two additional entries to the /etc/shorewall/policy C, it is necessary to simply add two additional entries to the /etc/shorewall/policy
file on system A.<br> file on system A.<br>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
<tbody> <tbody>
@ -542,14 +545,14 @@ file on system A.<br>
</tbody> </tbody>
</table> </table>
<br> <br>
</blockquote> </blockquote>
<h2><font color="#660066"><a name="RoadWarrior"></a> </font>Mobile System <h2><font color="#660066"><a name="RoadWarrior"></a> </font>Mobile System
(Road Warrior)</h2> (Road Warrior)</h2>
<p>Suppose that you have a laptop system (B) that you take with you when you <p>Suppose that you have a laptop system (B) that you take with you when
travel and you want to be able to establish a secure connection back to your you travel and you want to be able to establish a secure connection back
local network.</p> to your local network.</p>
<p align="center"><strong><font face="Century Gothic, Arial, Helvetica"> <p align="center"><strong><font face="Century Gothic, Arial, Helvetica">
<img src="images/Mobile.png" width="677" height="426"> <img src="images/Mobile.png" width="677" height="426">
@ -612,8 +615,8 @@ system.</p>
<h2><a name="Dynamic"></a>Dynamic RoadWarrior Zones</h2> <h2><a name="Dynamic"></a>Dynamic RoadWarrior Zones</h2>
Beginning with Shorewall release 1.3.10, you can define multiple VPN Beginning with Shorewall release 1.3.10, you can define multiple VPN
zones and add and delete remote endpoints dynamically using /sbin/shorewall. zones and add and delete remote endpoints dynamically using /sbin/shorewall.
In /etc/shorewall/zones:<br> In /etc/shorewall/zones:<br>
<br> <br>
<blockquote> <blockquote>
@ -707,8 +710,8 @@ comes down. For example, when 134.28.54.2 connects for the vpn2 zone the
</blockquote> </blockquote>
<h3>Limitations of Dynamic Zones</h3> <h3>Limitations of Dynamic Zones</h3>
If you include a dynamic zone in the exclude list of a DNAT rule, the dynamically-added If you include a dynamic zone in the exclude list of a DNAT rule, the
hosts are not excluded from the rule.<br> dynamically-added hosts are not excluded from the rule.<br>
<br> <br>
Example with dyn=dynamic zone:<br> Example with dyn=dynamic zone:<br>
<br> <br>
@ -755,7 +758,7 @@ comes down. For example, when 134.28.54.2 connects for the vpn2 zone the
</table> </table>
</blockquote> </blockquote>
Dynamic changes to the zone <b>dyn</b> will have no effect on the above Dynamic changes to the zone <b>dyn</b> will have no effect on the above
rule. rule.
<p><font size="2">Last updated 6/10//2003 - </font><font size="2"> <a <p><font size="2">Last updated 6/10//2003 - </font><font size="2"> <a
href="support.htm">Tom Eastep</a></font> </p> href="support.htm">Tom Eastep</a></font> </p>
@ -763,5 +766,6 @@ rule.
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br> <br>
<br>
</body> </body>
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -30,8 +30,8 @@
href="upgrade_issues.htm">Upgrade Issues<br> href="upgrade_issues.htm">Upgrade Issues<br>
</a></b></p> </a></b></p>
<div align="left"><b>Before attempting installation, I strongly urge you to <div align="left"><b>Before attempting installation, I strongly urge you
read and print a copy of the <a to read and print a copy of the <a
href="shorewall_quickstart_guide.htm">Shorewall QuickStart Guide</a> href="shorewall_quickstart_guide.htm">Shorewall QuickStart Guide</a>
for the configuration that most closely matches your own.</b><br> for the configuration that most closely matches your own.</b><br>
</div> </div>
@ -48,11 +48,11 @@ read and print a copy of the <a
<p><a name="Install_RPM"></a>To install Shorewall using the RPM:</p> <p><a name="Install_RPM"></a>To install Shorewall using the RPM:</p>
<p><b>If you have RedHat 7.2 and are running iptables version 1.2.3 (at a <p><b>If you have RedHat 7.2 and are running iptables version 1.2.3 (at a
shell prompt, type "/sbin/iptables --version"), you must upgrade to shell prompt, type "/sbin/iptables --version"), you must upgrade to version
version 1.2.4 either from the <a 1.2.4 either from the <a
href="http://www.redhat.com/support/errata/RHSA-2001-144.html">RedHat update href="http://www.redhat.com/support/errata/RHSA-2001-144.html">RedHat update
site</a> or from the <a href="errata.htm">Shorewall Errata page</a> site</a> or from the <a href="errata.htm">Shorewall Errata page</a> before
before attempting to start Shorewall.</b></p> attempting to start Shorewall.</b></p>
<ul> <ul>
<li>Install the RPM (rpm -ivh &lt;shorewall rpm&gt;).<br> <li>Install the RPM (rpm -ivh &lt;shorewall rpm&gt;).<br>
@ -75,12 +75,12 @@ before attempting to start Shorewall.</b></p>
<br> <br>
</li> </li>
<li>Edit the <a href="#Config_Files"> configuration files</a> <li>Edit the <a href="#Config_Files"> configuration files</a>
to match your configuration. <font color="#ff0000"><b>WARNING - YOU CAN to match your configuration. <font color="#ff0000"><b>WARNING - YOU CAN
<u>NOT</u> SIMPLY INSTALL THE RPM AND ISSUE A "shorewall start" COMMAND. <u>NOT</u> SIMPLY INSTALL THE RPM AND ISSUE A "shorewall start"
SOME CONFIGURATION IS REQUIRED BEFORE THE FIREWALL WILL START. IF YOU COMMAND. SOME CONFIGURATION IS REQUIRED BEFORE THE FIREWALL WILL START.
ISSUE A "start" COMMAND AND THE FIREWALL FAILS TO START, YOUR SYSTEM WILL IF YOU ISSUE A "start" COMMAND AND THE FIREWALL FAILS TO START, YOUR
NO LONGER ACCEPT ANY NETWORK TRAFFIC. IF THIS HAPPENS, ISSUE A "shorewall SYSTEM WILL NO LONGER ACCEPT ANY NETWORK TRAFFIC. IF THIS HAPPENS, ISSUE
clear" COMMAND TO RESTORE NETWORK CONNECTIVITY.</b></font></li> A "shorewall clear" COMMAND TO RESTORE NETWORK CONNECTIVITY.</b></font></li>
<li>Start the firewall by typing "shorewall start"</li> <li>Start the firewall by typing "shorewall start"</li>
</ul> </ul>
@ -99,33 +99,33 @@ the directory name as in "shorewall-1.1.10").</li>
href="http://www.corel.com">Corel</a>, <a href="http://www.corel.com">Corel</a>, <a
href="http://www.slackware.com/">Slackware</a> or <a href="http://www.slackware.com/">Slackware</a> or <a
href="http://www.debian.org">Debian</a> then type "./install.sh"</li> href="http://www.debian.org">Debian</a> then type "./install.sh"</li>
<li>If you are using <a href="http://www.suse.com">SuSe</a> then <li>If you are using <a href="http://www.suse.com">SuSe</a>
type "./install.sh /etc/init.d"</li> then type "./install.sh /etc/init.d"</li>
<li>If your distribution has directory /etc/rc.d/init.d <li>If your distribution has directory /etc/rc.d/init.d
or /etc/init.d then type "./install.sh"</li> or /etc/init.d then type "./install.sh"</li>
<li>For other distributions, determine where your <li>For other distributions, determine where your
distribution installs init scripts and type "./install.sh distribution installs init scripts and type "./install.sh
&lt;init script directory&gt;</li> &lt;init script directory&gt;</li>
<li>Edit the <a href="#Config_Files"> configuration files</a> <li>Edit the <a href="#Config_Files"> configuration files</a>
to match your configuration.</li> to match your configuration.</li>
<li>Start the firewall by typing "shorewall start"</li> <li>Start the firewall by typing "shorewall start"</li>
<li>If the install script was unable to configure Shorewall to <li>If the install script was unable to configure Shorewall
be started automatically at boot, see <a to be started automatically at boot, see <a
href="starting_and_stopping_shorewall.htm">these instructions</a>.</li> href="starting_and_stopping_shorewall.htm">these instructions</a>.</li>
</ul> </ul>
<p><a name="LRP"></a>To install my version of Shorewall on a fresh Bering <p><a name="LRP"></a>To install my version of Shorewall on a fresh Bering
disk, simply replace the "shorwall.lrp" file on the image with the file disk, simply replace the "shorwall.lrp" file on the image with the file
that you downloaded. See the <a href="two-interface.htm">two-interface QuickStart that you downloaded. See the <a href="two-interface.htm">two-interface
Guide</a> for information about further steps required.</p> QuickStart Guide</a> for information about further steps required.</p>
<p><a name="Upgrade_RPM"></a>If you already have the Shorewall RPM installed <p><a name="Upgrade_RPM"></a>If you already have the Shorewall RPM installed
and are upgrading to a new version:</p> and are upgrading to a new version:</p>
<p>If you are upgrading from a 1.2 version of Shorewall to a 1.4 version <p>If you are upgrading from a 1.2 version of Shorewall to a 1.4 version or
or and you have entries in the /etc/shorewall/hosts file then please check and you have entries in the /etc/shorewall/hosts file then please check
your /etc/shorewall/interfaces file to be sure that it contains an entry your /etc/shorewall/interfaces file to be sure that it contains an entry
for each interface mentioned in the hosts file. Also, there are certain for each interface mentioned in the hosts file. Also, there are certain
1.2 rule forms that are no longer supported under 1.4 (you must use the 1.2 rule forms that are no longer supported under 1.4 (you must use the
new 1.4 syntax). See <a href="errata.htm#Upgrade">the upgrade issues </a>for new 1.4 syntax). See <a href="errata.htm#Upgrade">the upgrade issues </a>for
@ -149,26 +149,26 @@ or and you have entries in the /etc/shorewall/hosts file then please check
     error: failed dependencies:iproute is needed by shorewall-1.4.0-1      error: failed dependencies:iproute is needed by shorewall-1.4.0-1
<br> <br>
<br> <br>
This may be worked around by using the --nodeps option of rpm (rpm -Uvh This may be worked around by using the --nodeps option of rpm (rpm
--nodeps &lt;shorewall rpm&gt;). </p> -Uvh --nodeps &lt;shorewall rpm&gt;). </p>
</li> </li>
<li>See if there are any incompatibilities between your configuration <li>See if there are any incompatibilities between your configuration
and the new Shorewall version (type "shorewall check") and correct and the new Shorewall version (type "shorewall check") and correct as
as necessary.</li> necessary.</li>
<li>Restart the firewall (shorewall restart).</li> <li>Restart the firewall (shorewall restart).</li>
</ul> </ul>
<p><a name="Upgrade_Tarball"></a>If you already have Shorewall installed and <p><a name="Upgrade_Tarball"></a>If you already have Shorewall installed
are upgrading to a new version using the tarball:</p> and are upgrading to a new version using the tarball:</p>
<p>If you are upgrading from a 1.2 version of Shorewall to a 1.4 version and <p>If you are upgrading from a 1.2 version of Shorewall to a 1.4 version
you have entries in the /etc/shorewall/hosts file then please check your and you have entries in the /etc/shorewall/hosts file then please check
/etc/shorewall/interfaces file to be sure that it contains an entry for your /etc/shorewall/interfaces file to be sure that it contains an entry
each interface mentioned in the hosts file.  Also, there are certain 1.2 for each interface mentioned in the hosts file.  Also, there are certain
rule forms that are no longer supported under 1.4 (you must use the new 1.2 rule forms that are no longer supported under 1.4 (you must use the
1.4 syntax). See <a href="errata.htm#Upgrade">the upgrade issues</a> for new 1.4 syntax). See <a href="errata.htm#Upgrade">the upgrade issues</a>
details. </p> for details. </p>
<ul> <ul>
<li>unpack the tarball (tar -zxf shorewall-x.y.z.tgz).</li> <li>unpack the tarball (tar -zxf shorewall-x.y.z.tgz).</li>
@ -181,28 +181,28 @@ the directory name as in "shorewall-3.0.1").</li>
href="http://www.corel.com">Corel</a>, <a href="http://www.corel.com">Corel</a>, <a
href="http://www.slackware.com/">Slackware</a> or <a href="http://www.slackware.com/">Slackware</a> or <a
href="http://www.debian.org">Debian</a> then type "./install.sh"</li> href="http://www.debian.org">Debian</a> then type "./install.sh"</li>
<li>If you are using<a href="http://www.suse.com"> SuSe</a> then <li>If you are using<a href="http://www.suse.com"> SuSe</a>
type "./install.sh /etc/init.d"</li> then type "./install.sh /etc/init.d"</li>
<li>If your distribution has directory /etc/rc.d/init.d <li>If your distribution has directory /etc/rc.d/init.d
or /etc/init.d then type "./install.sh"</li> or /etc/init.d then type "./install.sh"</li>
<li>For other distributions, determine where your <li>For other distributions, determine where your
distribution installs init scripts and type "./install.sh distribution installs init scripts and type "./install.sh
&lt;init script directory&gt;</li> &lt;init script directory&gt;</li>
<li>See if there are any incompatibilities between your configuration <li>See if there are any incompatibilities between your configuration
and the new Shorewall version (type "shorewall check") and correct and the new Shorewall version (type "shorewall check") and correct as
as necessary.</li> necessary.</li>
<li>Restart the firewall by typing "shorewall restart"</li> <li>Restart the firewall by typing "shorewall restart"</li>
</ul> </ul>
<a name="LRP_Upgrade"></a>If you already have a running Bering <a name="LRP_Upgrade"></a>If you already have a running
installation and wish to upgrade to a later version of Shorewall:<br> Bering installation and wish to upgrade to a later version of Shorewall:<br>
<br> <br>
    <b>UNDER CONSTRUCTION...</b><br>     <b>UNDER CONSTRUCTION...</b><br>
<h3><a name="Config_Files"></a>Configuring Shorewall</h3> <h3><a name="Config_Files"></a>Configuring Shorewall</h3>
<p>You will need to edit some or all of the configuration files to match <p>You will need to edit some or all of the configuration files to match your
your setup. In most cases, the <a href="shorewall_quickstart_guide.htm">Shorewall setup. In most cases, the <a href="shorewall_quickstart_guide.htm">Shorewall
QuickStart Guides</a> contain all of the information you need.</p> QuickStart Guides</a> contain all of the information you need.</p>
<ul> <ul>
@ -216,5 +216,6 @@ your setup. In most cases, the <a href="shorewall_quickstart_guide.htm">Shorewa
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br> <br>
<br>
</body> </body>
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@ -12,7 +12,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4" style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -37,24 +37,24 @@
<ol> <ol>
<li>The <b>maclist</b> interface option in <a <li>The <b>maclist</b> interface option in <a
href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>. When this href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>. When
option is specified, all traffic arriving on the interface is subjet to MAC this option is specified, all traffic arriving on the interface is subjet
verification.</li> to MAC verification.</li>
<li>The <b>maclist </b>option in <a <li>The <b>maclist </b>option in <a
href="Documentation.htm#Hosts">/etc/shorewall/hosts</a>. When this option href="Documentation.htm#Hosts">/etc/shorewall/hosts</a>. When this option
is specified for a subnet, all traffic from that subnet is subject to MAC is specified for a subnet, all traffic from that subnet is subject to
verification.</li> MAC verification.</li>
<li>The /etc/shorewall/maclist file. This file is used to associate <li>The /etc/shorewall/maclist file. This file is used to associate
MAC addresses with interfaces and to optionally associate IP addresses MAC addresses with interfaces and to optionally associate IP addresses
with MAC addresses.</li> with MAC addresses.</li>
<li>The <b>MACLIST_DISPOSITION </b>and <b>MACLIST_LOG_LEVEL <li>The <b>MACLIST_DISPOSITION </b>and <b>MACLIST_LOG_LEVEL
</b>variables in <a href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a> </b>variables in <a href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a>
The MACLIST_DISPOSITION variable has the value DROP, REJECT or ACCEPT The MACLIST_DISPOSITION variable has the value DROP, REJECT or ACCEPT
and determines the disposition of connection requests that fail MAC verification. and determines the disposition of connection requests that fail MAC verification.
The MACLIST_LOG_LEVEL variable gives the syslogd level at which connection The MACLIST_LOG_LEVEL variable gives the syslogd level at which connection
requests that fail verification are to be logged. If set the the empty requests that fail verification are to be logged. If set the the empty
value (e.g., MACLIST_LOG_LEVEL="") then failing connection requests are value (e.g., MACLIST_LOG_LEVEL="") then failing connection requests are
not logged.<br> not logged.<br>
</li> </li>
</ol> </ol>
@ -89,10 +89,10 @@ details about my setup):</h3>
As shown above, I use MAC Verification on my wireless zone.<br> As shown above, I use MAC Verification on my wireless zone.<br>
<br> <br>
<b>Note: </b>While marketed as a wireless bridge, the WET11 behaves like <b>Note: </b>While marketed as a wireless bridge, the WET11 behaves like
a wireless router with DHCP relay. When forwarding DHCP traffic, it uses a wireless router with DHCP relay. When forwarding DHCP traffic, it uses the
the MAC address of the host (TIPPER) but for other forwarded traffic it uses MAC address of the host (TIPPER) but for other forwarded traffic it uses it's
it's own MAC address. Consequently, I list the IP addresses of both devices own MAC address. Consequently, I list the IP addresses of both devices in
in /etc/shorewall/maclist.<br> /etc/shorewall/maclist.<br>
<h3>Example 2: Router in Wireless Zone</h3> <h3>Example 2: Router in Wireless Zone</h3>
Suppose now that I add a second wireless segment to my wireless Suppose now that I add a second wireless segment to my wireless
@ -103,11 +103,11 @@ in /etc/shorewall/maclist.<br>
<pre> eth3 00:06:43:45:C6:15 192.168.3.253,192.168.4.0/24<br></pre> <pre> eth3 00:06:43:45:C6:15 192.168.3.253,192.168.4.0/24<br></pre>
This entry accomodates traffic from the router itself (192.168.3.253) This entry accomodates traffic from the router itself (192.168.3.253)
and from the second wireless segment (192.168.4.0/24). Remember that all and from the second wireless segment (192.168.4.0/24). Remember that
traffic being sent to my firewall from the 192.168.4.0/24 segment will all traffic being sent to my firewall from the 192.168.4.0/24 segment
be forwarded by the router so that traffic's MAC address will be that will be forwarded by the router so that traffic's MAC address will be
of the router (00:06:43:45:C6:15) and not that of the host sending the that of the router (00:06:43:45:C6:15) and not that of the host sending
traffic. the traffic.
<p><font size="2"> Updated 6/30/2002 - <a href="support.htm">Tom Eastep</a> <p><font size="2"> Updated 6/30/2002 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
@ -119,5 +119,6 @@ traffic.
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
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@ -12,46 +12,47 @@
</head> </head>
<body> <body>
<blockquote> <table border="0" cellpadding="0" cellspacing="0"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" id="AutoNumber1" bgcolor="#3366ff" height="90">
bgcolor="#400169" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Static NAT</font></h1> <h1 align="center"><font color="#ffffff">Static Nat</font></h1>
</td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<br>
<br>
<p><font color="#ff0000"><b>IMPORTANT: If all you want to do is forward <p><font color="#ff0000"><b>IMPORTANT: If all you want to do is forward
ports to servers behind your firewall, you do NOT want to use static ports to servers behind your firewall, you do NOT want to use static
NAT. Port forwarding can be accomplished with simple entries in the NAT. Port forwarding can be accomplished with simple entries in the
<a href="Documentation.htm#Rules">rules file</a>.</b></font></p> <a href="Documentation.htm#Rules">rules file</a>.</b></font></p>
<blockquote> </blockquote>
<p>Static NAT is a way to make systems behind a firewall and configured <p>Static NAT is a way to make systems behind a firewall and configured
with private IP addresses (those reserved for private use in RFC1918) with private IP addresses (those reserved for private use in RFC1918)
appear to have public IP addresses. Before you try to use this technique, appear to have public IP addresses. Before you try to use this technique,
I strongly recommend that you read the <a I strongly recommend that you read the <a
href="shorewall_setup_guide.htm">Shorewall Setup Guide.</a></p> href="shorewall_setup_guide.htm">Shorewall Setup Guide.</a></p>
<blockquote> </blockquote>
<p>The following figure represents a static NAT environment.</p> <p>The following figure represents a static NAT environment.</p>
<blockquote>
<p align="center"><strong> <img src="images/staticnat.png" <p align="center"><strong> <img src="images/staticnat.png"
width="435" height="397"> width="435" height="397">
</strong></p> </strong></p>
<blockquote> </blockquote> <blockquote> </blockquote>
</blockquote>
<p align="left">Static NAT can be used to make the systems with the 10.1.1.*
addresses appear to be on the upper (130.252.100.*) subnet. If we assume
that the interface to the upper subnet is eth0, then the following /etc/shorewall/NAT
file would make the lower left-hand system appear to have IP address
130.252.100.18 and the right-hand one to have IP address 130.252.100.19.</p>
<p align="left">Static NAT can be used to make the systems with the 10.1.1.* <table border="2" cellpadding="2" style="border-collapse: collapse;">
addresses appear to be on the upper (130.252.100.*) subnet. If we assume
that the interface to the upper subnet is eth0, then the following /etc/shorewall/NAT
file would make the lower left-hand system appear to have IP address 130.252.100.18
and the right-hand one to have IP address 130.252.100.19.</p>
<table border="2" cellpadding="2" style="border-collapse: collapse;">
<tbody> <tbody>
<tr> <tr>
<td><b>EXTERNAL</b></td> <td><b>EXTERNAL</b></td>
@ -76,36 +77,35 @@ and the right-hand one to have IP address 130.252.100.19.</p>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<p>Be sure that the internal system(s) (10.1.1.2 and 10.1.1.3 in the above <p>Be sure that the internal system(s) (10.1.1.2 and 10.1.1.3 in the above
example) is (are) not included in any specification in /etc/shorewall/masq example) is (are) not included in any specification in /etc/shorewall/masq
or /etc/shorewall/proxyarp.</p> or /etc/shorewall/proxyarp.</p>
<p><a name="AllInterFaces"></a>Note 1: The "ALL INTERFACES" column is used <p><a name="AllInterFaces"></a>Note 1: The "ALL INTERFACES" column is used
to specify whether access to the external IP from all firewall interfaces to specify whether access to the external IP from all firewall interfaces
should undergo NAT (Yes or yes) or if only access from the interface in should undergo NAT (Yes or yes) or if only access from the interface in
the INTERFACE column should undergo NAT. If you leave this column empty, the INTERFACE column should undergo NAT. If you leave this column empty,
"Yes" is assumed. The ALL INTERFACES column was added in version 1.1.6.</p> "Yes" is assumed. The ALL INTERFACES column was added in version 1.1.6.</p>
<p>Note 2: Shorewall will automatically add the external address to the <p>Note 2: Shorewall will automatically add the external address to the
specified interface unless you specify <a specified interface unless you specify <a
href="Documentation.htm#Aliases">ADD_IP_ALIASES</a>="no" (or "No") in href="Documentation.htm#Aliases">ADD_IP_ALIASES</a>="no" (or "No") in
/etc/shorewall/shorewall.conf; If you do not set ADD_IP_ALIASES or if /etc/shorewall/shorewall.conf; If you do not set ADD_IP_ALIASES or
you set it to "Yes" or "yes" then you must NOT configure your own alias(es). if you set it to "Yes" or "yes" then you must NOT configure your own alias(es).
<b>RESTRICTION: </b>Shorewall versions earlier than 1.4.6 can only add <b>RESTRICTION: </b>Shorewall versions earlier than 1.4.6 can only add
external addresses to an interface that is configured with a single subnetwork external addresses to an interface that is configured with a single subnetwork
-- if your external interface has addresses in more than one subnetwork, -- if your external interface has addresses in more than one subnetwork,
Shorewall 1.4.5 and earlier can only add addresses to the first one.</p> Shorewall 1.4.5 and earlier can only add addresses to the first one.</p>
<p><a name="LocalPackets"></a>Note 3: The contents of the "LOCAL" column <p><a name="LocalPackets"></a>Note 3: The contents of the "LOCAL" column
determine whether packets originating on the firewall itself and destined determine whether packets originating on the firewall itself and destined
for the EXTERNAL address are redirected to the internal ADDRESS. If for the EXTERNAL address are redirected to the internal ADDRESS. If
this column contains "yes" or "Yes" (and the ALL INTERFACES COLUMN also this column contains "yes" or "Yes" (and the ALL INTERFACES COLUMN
contains "Yes" or "yes") then such packets are redirected; otherwise, also contains "Yes" or "yes") then such packets are redirected; otherwise,
such packets are not redirected. The LOCAL column was added in version such packets are not redirected. The LOCAL column was added in version
1.1.8.</p> 1.1.8.</p>
</blockquote>
<blockquote> </blockquote> <blockquote> </blockquote>
@ -113,5 +113,7 @@ such packets are not redirected. The LOCAL column was added in version
href="support.htm">Tom Eastep</a></font> </p> href="support.htm">Tom Eastep</a></font> </p>
<a href="copyright.htm"><font size="2">Copyright</font> © <font <a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
<br>
<br>
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -78,8 +78,8 @@ the GPL</a>. OpenVPN can be downloaded from <a
</table> </table>
</blockquote> </blockquote>
<p align="left">On system A, the 10.0.0.0/8 will comprise the <b>vpn</b> <p align="left">On system A, the 10.0.0.0/8 will comprise the <b>vpn</b> zone.
zone. In /etc/shorewall/interfaces:</p> In /etc/shorewall/interfaces:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -235,8 +235,8 @@ gateway. If you change the port used by OpenVPN to 7777, you can define
</blockquote> </blockquote>
<p align="left">You will need to allow traffic between the "vpn" zone and <p align="left">You will need to allow traffic between the "vpn" zone and
the "loc" zone on both systems -- if you simply want to admit all the "loc" zone on both systems -- if you simply want to admit all traffic
traffic in both directions, you can use the policy file:</p> in both directions, you can use the policy file:</p>
<blockquote> <blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -279,5 +279,6 @@ traffic in both directions, you can use the policy file:</p>
<br> <br>
<br> <br>
<br> <br>
<br>
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -27,23 +27,26 @@
</tbody> </tbody>
</table> </table>
<h4>NOTE: I am no longer attempting to maintain MPPE patches for current <h4>NOTE: I am no longer attempting to maintain MPPE patches for current Linux
Linux kernel's and pppd. I recommend that you refer to the following URLs kernel's and pppd. I recommend that you refer to the following URLs for information
for information about installing MPPE into your kernel and pppd.</h4> about installing MPPE into your kernel and pppd.</h4>
<h4>The <a href="http://pptpclient.sourceforge.net">Linux PPTP client project <h4>The <a href="http://pptpclient.sourceforge.net">Linux PPTP client project
</a>has a nice GUI for configuring and managing VPN connections where your </a>has a nice GUI for configuring and managing VPN connections where your
Linux system is the PPTP client. This is what I currently use. I am no longer Linux system is the PPTP client. This is what I currently use. I am no longer
running PoPToP but rather I use the PPTP Server included with XP Professional running PoPToP but rather I use the PPTP Server included with XP Professional
(see <a href="#ServerBehind">PPTP Server running behind your Firewall</a> (see <a href="#ServerBehind">PPTP Server running behind your Firewall</a>
below).</h4> below).</h4>
    <a href="http://pptpclient.sourceforge.net">http://pptpclient.sourceforge.net</a>     <a href="http://pptpclient.sourceforge.net">http://pptpclient.sourceforge.net</a>
(Everything you need to run a PPTP client).<br> (Everything you need to run a PPTP client).<br>
    <a href="http://www.poptop.org">http://www.poptop.org</a> (The 'kernelmod'     <a href="http://www.poptop.org">http://www.poptop.org</a> (The 'kernelmod'
package can be used to quickly install MPPE into your kernel without rebooting).<br> package can be used to quickly install MPPE into your kernel without rebooting).<br>
<h4>I am leaving the instructions for building MPPE-enabled kernels and pppd <h4>I am leaving the instructions for building MPPE-enabled kernels and pppd
in the text below for those who may wish to obtain the relevant current patches in the text below for those who may wish to obtain the relevant current patches
and "roll their own".<br> and "roll their own".<br>
</h4> </h4>
<hr width="100%" size="2"> <hr width="100%" size="2">
<p align="left">Shorewall easily supports PPTP in a number of configurations:</p> <p align="left">Shorewall easily supports PPTP in a number of configurations:</p>
@ -56,12 +59,11 @@ and "roll their own".<br>
</ul> </ul>
<h2 align="center"><a name="ServerFW"></a>1. PPTP Server Running on your <h2 align="center"><a name="ServerFW"></a>1. PPTP Server Running on your Firewall</h2>
Firewall</h2>
<p>I will try to give you an idea of how to set up a PPTP server on your <p>I will try to give you an idea of how to set up a PPTP server on your firewall
firewall system. This isn't a detailed HOWTO but rather an example of how system. This isn't a detailed HOWTO but rather an example of how I have set
I have set up a working PPTP server on my own firewall.</p> up a working PPTP server on my own firewall.</p>
<p>The steps involved are:</p> <p>The steps involved are:</p>
@ -91,7 +93,7 @@ I have set up a working PPTP server on my own firewall.</p>
</ul> </ul>
<p>You may also want the following patch if you want to require remote hosts <p>You may also want the following patch if you want to require remote hosts
to use encryption:</p> to use encryption:</p>
<ul> <ul>
<li><a <li><a
@ -113,7 +115,7 @@ to use encryption:</p>
</ul> </ul>
<p>You will need to install the resulting binary on your firewall system. <p>You will need to install the resulting binary on your firewall system.
To do that, I NFS mount my source filesystem and use "make install" from To do that, I NFS mount my source filesystem and use "make install" from
the ppp-2.4.1 directory.</p> the ppp-2.4.1 directory.</p>
<h3><a name="PatchKernel"></a>Patching and Building your Kernel</h3> <h3><a name="PatchKernel"></a>Patching and Building your Kernel</h3>
@ -146,9 +148,9 @@ the ppp-2.4.1 directory.</p>
<h3><a name="Samba"></a>Configuring Samba</h3> <h3><a name="Samba"></a>Configuring Samba</h3>
<p>You will need a WINS server (Samba configured to run as a WINS server <p>You will need a WINS server (Samba configured to run as a WINS server is
is fine). Global section from /etc/samba/smb.conf on my WINS server (192.168.1.3) fine). Global section from /etc/samba/smb.conf on my WINS server (192.168.1.3)
is:</p> is:</p>
<blockquote> <blockquote>
<pre>[global]<br> workgroup = TDM-NSTOP<br> netbios name = WOOKIE<br> server string = GNU/Linux Box<br> encrypt passwords = Yes<br> log file = /var/log/samba/%m.log<br> max log size = 0<br> socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192<br> os level = 65<br> domain master = True<br> preferred master = True<br> dns proxy = No<br> wins support = Yes<br> printing = lprng<br><br>[homes]<br> comment = Home Directories<br> valid users = %S<br> read only = No<br> create mask = 0664<br> directory mask = 0775<br><br>[printers]<br> comment = All Printers<br> path = /var/spool/samba<br> printable = Yes</pre> <pre>[global]<br> workgroup = TDM-NSTOP<br> netbios name = WOOKIE<br> server string = GNU/Linux Box<br> encrypt passwords = Yes<br> log file = /var/log/samba/%m.log<br> max log size = 0<br> socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192<br> os level = 65<br> domain master = True<br> preferred master = True<br> dns proxy = No<br> wins support = Yes<br> printing = lprng<br><br>[homes]<br> comment = Home Directories<br> valid users = %S<br> read only = No<br> create mask = 0664<br> directory mask = 0775<br><br>[printers]<br> comment = All Printers<br> path = /var/spool/samba<br> printable = Yes</pre>
@ -186,11 +188,11 @@ is:</p>
<ul> <ul>
<li>System 192.168.1.3 acts as a WINS server so I have included that <li>System 192.168.1.3 acts as a WINS server so I have included that
IP as the 'ms-wins' value.</li> IP as the 'ms-wins' value.</li>
<li>I have pointed the remote clients at my DNS server -- it has external <li>I have pointed the remote clients at my DNS server -- it has external
address 206.124.146.177.</li> address 206.124.146.177.</li>
<li>I am requiring 128-bit stateless compression (my kernel is built <li>I am requiring 128-bit stateless compression (my kernel is built
with the 'require-mppe.diff' patch mentioned above.</li> with the 'require-mppe.diff' patch mentioned above.</li>
</ul> </ul>
@ -204,9 +206,9 @@ with the 'require-mppe.diff' patch mentioned above.</li>
</blockquote> </blockquote>
<p>I am the only user who connects to the server but I may connect either <p>I am the only user who connects to the server but I may connect either
with or without a domain being specified. The system I connect from is my with or without a domain being specified. The system I connect from is my
laptop so I give it the same IP address when tunneled in at it has when I laptop so I give it the same IP address when tunneled in at it has when
use its wireless LAN card around the house.</p> I use its wireless LAN card around the house.</p>
<p>You will also want the following in /etc/modules.conf:</p> <p>You will also want the following in /etc/modules.conf:</p>
@ -229,11 +231,11 @@ use its wireless LAN card around the house.</p>
<ul> <ul>
<li>I specify the /etc/ppp/options.poptop file as my ppp options file <li>I specify the /etc/ppp/options.poptop file as my ppp options file
(I have several).</li> (I have several).</li>
<li>The local IP is the same as my internal interface's (192.168.1.254).</li> <li>The local IP is the same as my internal interface's (192.168.1.254).</li>
<li>I have assigned a remote IP range that overlaps my local network. <li>I have assigned a remote IP range that overlaps my local network.
This, together with 'proxyarp' in my /etc/ppp/options.poptop file make This, together with 'proxyarp' in my /etc/ppp/options.poptop file make
the remote hosts look like they are part of the local subnetwork.</li> the remote hosts look like they are part of the local subnetwork.</li>
</ul> </ul>
@ -440,8 +442,8 @@ the remote hosts look like they are part of the local subnetwork.</li>
</table> </table>
</blockquote> </blockquote>
<p align="left"><b>/etc/shoreawll/tunnels (For Shorewall versions 1.3.10 and <p align="left"><b>/etc/shoreawll/tunnels (For Shorewall versions 1.3.10
later)<br> and later)<br>
</b></p> </b></p>
<blockquote> <blockquote>
@ -474,7 +476,7 @@ later)<br>
<p align="left"><br> <p align="left"><br>
Note: I have multiple ppp interfaces on my firewall. If you have a single Note: I have multiple ppp interfaces on my firewall. If you have a single
ppp interface, you probably want:</p> ppp interface, you probably want:</p>
<h4>/etc/shorewall/interfaces:</h4> <h4>/etc/shorewall/interfaces:</h4>
@ -513,10 +515,10 @@ ppp interface, you probably want:</p>
<p align="left">and <u><b>no</b></u> entries in /etc/shorewall/hosts.</p> <p align="left">and <u><b>no</b></u> entries in /etc/shorewall/hosts.</p>
<h2 align="center"><a name="ServerBehind"></a>2. PPTP Server Running Behind <h2 align="center"><a name="ServerBehind"></a>2. PPTP Server Running Behind
your Firewall</h2> your Firewall</h2>
<p>If you have a single external IP address, add the following to your <p>If you have a single external IP address, add the following to your /etc/shorewall/rules
/etc/shorewall/rules file:</p> file:</p>
<font face="Century Gothic, Arial, Helvetica"> </font> <font face="Century Gothic, Arial, Helvetica"> </font>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
<tbody> <tbody>
@ -555,8 +557,8 @@ your Firewall</h2>
</table> </table>
<p>If you have multiple external IP address and you want to forward a single <p>If you have multiple external IP address and you want to forward a single
<i>&lt;external address&gt;, </i>add the following to your /etc/shorewall/rules <i>&lt;external address&gt;, </i>add the following to your /etc/shorewall/rules
file:</p> file:</p>
<p> <font face="Century Gothic, Arial, Helvetica"> </font> <p> <font face="Century Gothic, Arial, Helvetica"> </font>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
@ -597,11 +599,11 @@ file:</p>
</p> </p>
<h2 align="center"><a name="ClientsBehind"></a>3. PPTP Clients Running Behind <h2 align="center"><a name="ClientsBehind"></a>3. PPTP Clients Running Behind
your Firewall</h2> your Firewall</h2>
<p>You shouldn't have to take any special action for this case unless you <p>You shouldn't have to take any special action for this case unless you
wish to connect multiple clients to the same external server. In that case, wish to connect multiple clients to the same external server. In that case,
you will need to follow the instructions at <a you will need to follow the instructions at <a
href="http://www.impsec.org/linux/masquerade/ip_masq_vpn.html">http://www.impsec.org/linux/masquerade/ip_masq_vpn.html</a>. href="http://www.impsec.org/linux/masquerade/ip_masq_vpn.html">http://www.impsec.org/linux/masquerade/ip_masq_vpn.html</a>.
I recommend that you also add these two lines to your /etc/shorewall/modules I recommend that you also add these two lines to your /etc/shorewall/modules
file: </p> file: </p>
@ -611,16 +613,15 @@ you will need to follow the instructions at <a
loadmodule ip_nat_pptp </p> loadmodule ip_nat_pptp </p>
</blockquote> </blockquote>
<h2 align="center"><a name="ClientFW"></a>4. PPTP Client Running on your <h2 align="center"><a name="ClientFW"></a>4. PPTP Client Running on your Firewall.</h2>
Firewall.</h2>
<p align="left">The PPTP GNU/Linux client is available at <a <p align="left">The PPTP GNU/Linux client is available at <a
href="http://sourceforge.net/projects/pptpclient/">http://sourceforge.net/projects/pptpclient/</a>.    href="http://sourceforge.net/projects/pptpclient/">http://sourceforge.net/projects/pptpclient/</a>.   
Rather than use the configuration script that comes with the client, I built Rather than use the configuration script that comes with the client, I
my own. I also build my own kernel <a href="#PatchKernel">as described above</a> built my own. I also build my own kernel <a href="#PatchKernel">as described
rather than using the mppe package that is available with the client. My above</a> rather than using the mppe package that is available with the
/etc/ppp/options file is mostly unchanged from what came with the client (see client. My /etc/ppp/options file is mostly unchanged from what came with
below).</p> the client (see below).</p>
<p>The key elements of this setup are as follows: </p> <p>The key elements of this setup are as follows: </p>
@ -770,14 +771,14 @@ below).</p>
<br> <br>
</blockquote> </blockquote>
<p>I use the combination of interface and hosts file to define the 'cpq' <p>I use the combination of interface and hosts file to define the 'cpq' zone
zone because I also run a PPTP server on my firewall (see above). Using this because I also run a PPTP server on my firewall (see above). Using this
technique allows me to distinguish clients of my own PPTP server from arbitrary technique allows me to distinguish clients of my own PPTP server from arbitrary
hosts at Compaq; I assign addresses in 192.168.1.0/24 to my PPTP clients hosts at Compaq; I assign addresses in 192.168.1.0/24 to my PPTP clients
and Compaq doesn't use that RFC1918 Class C subnet. </p> and Compaq doesn't use that RFC1918 Class C subnet. </p>
<p>I use this script in /etc/init.d to control the client. The reason that <p>I use this script in /etc/init.d to control the client. The reason that
I disable ECN when connecting is that the Compaq tunnel servers don't do I disable ECN when connecting is that the Compaq tunnel servers don't do
ECN yet and reject the initial TCP connection request if I enable ECN :-( ECN yet and reject the initial TCP connection request if I enable ECN :-(
</p> </p>
@ -923,5 +924,6 @@ ECN yet and reject the initial TCP connection request if I enable ECN :-(
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

28
Shorewall-docs/ProxyARP.htm
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -92,24 +92,25 @@ rather than behind it.<br>
(130.252.100.18 and 130.252.100.19 in the above example)  to the external (130.252.100.18 and 130.252.100.19 in the above example)  to the external
interface (eth0 in this example) of the firewall.</b></font><br> interface (eth0 in this example) of the firewall.</b></font><br>
</p> </p>
<div align="left"> </div> <div align="left"> </div>
<div align="left"> <div align="left">
<p align="left">A word of warning is in order here. ISPs typically configure <p align="left">A word of warning is in order here. ISPs typically configure
their routers with a long ARP cache timeout. If you move a system from their routers with a long ARP cache timeout. If you move a system from
parallel to your firewall to behind your firewall with Proxy ARP, it will parallel to your firewall to behind your firewall with Proxy ARP, it
probably be HOURS before that system can communicate with the internet. will probably be HOURS before that system can communicate with the internet.
There are a couple of things that you can try:<br> There are a couple of things that you can try:<br>
</p> </p>
<ol> <ol>
<li>(Courtesy of Bradey Honsinger) A reading of Stevens' <i>TCP/IP Illustrated, <li>(Courtesy of Bradey Honsinger) A reading of Stevens' <i>TCP/IP
Vol 1</i> reveals that a <br> Illustrated, Vol 1</i> reveals that a <br>
<br> <br>
"gratuitous" ARP packet should cause the ISP's router to refresh their "gratuitous" ARP packet should cause the ISP's router to refresh their
ARP cache (section 4.7). A gratuitous ARP is simply a host requesting the ARP cache (section 4.7). A gratuitous ARP is simply a host requesting the
MAC address for its own IP; in addition to ensuring that the IP address isn't MAC address for its own IP; in addition to ensuring that the IP address
a duplicate...<br> isn't a duplicate...<br>
<br> <br>
"if the host sending the gratuitous ARP has just changed its hardware "if the host sending the gratuitous ARP has just changed its hardware
address..., this packet causes any other host...that has an entry in its address..., this packet causes any other host...that has an entry in its
@ -124,9 +125,9 @@ iputils package include "arping", whose "-U" flag does just that:<br>
proxied IP&gt;</i></b></font><br> proxied IP&gt;</i></b></font><br>
    <font color="#009900"><b>arping -U -I eth0 66.58.99.83 # for example</b></font><br>     <font color="#009900"><b>arping -U -I eth0 66.58.99.83 # for example</b></font><br>
<br> <br>
Stevens goes on to mention that not all systems respond correctly to gratuitous Stevens goes on to mention that not all systems respond correctly to
ARPs, but googling for "arping -U" seems to support the idea that it works gratuitous ARPs, but googling for "arping -U" seems to support the idea
most of the time.<br> that it works most of the time.<br>
<br> <br>
To use arping with Proxy ARP in the above example, you would have to:<br> To use arping with Proxy ARP in the above example, you would have to:<br>
<br> <br>
@ -174,9 +175,9 @@ dev eth0<br>
<p align="left">Notice that the source MAC address in the echo request is <p align="left">Notice that the source MAC address in the echo request is
different from the destination MAC address in the echo reply!! In this different from the destination MAC address in the echo reply!! In this
case 0:4:e2:20:20:33 was the MAC of the firewall's eth0 NIC while 0:c0:a8:50:b2:57 case 0:4:e2:20:20:33 was the MAC of the firewall's eth0 NIC while 0:c0:a8:50:b2:57
was the MAC address of the system on the lower left. In other words, the was the MAC address of the system on the lower left. In other words,
gateway's ARP cache still associates 130.252.100.19 with the NIC in that the gateway's ARP cache still associates 130.252.100.19 with the NIC
system rather than with the firewall's eth0.</p> in that system rather than with the firewall's eth0.</p>
</div> </div>
<p><font size="2">Last updated 3/21/2003 - </font><font size="2"> <a <p><font size="2">Last updated 3/21/2003 - </font><font size="2"> <a
@ -186,5 +187,6 @@ dev eth0<br>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

9
Shorewall-docs/SeattleInTheSpring.html
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -32,10 +32,10 @@
<b>March 6, 2003 - Nice day for a walk....</b><br> <b>March 6, 2003 - Nice day for a walk....</b><br>
<br> <br>
<img src="images/P1000050.jpg" alt="" width="640" height="480"> <img src="images/P1000050.jpg" alt="" width="640" height="480">
<br>
<br> <br>
<br> <br>
<img src="images/P1000049.jpg" alt="" width="480" height="640"> <br>
<img src="images/P1000049.jpg" alt="" width="480" height="640">
<p><b>The view from my office window -- think I'll go out and enjoy the deck <p><b>The view from my office window -- think I'll go out and enjoy the deck
(Yes -- that is snow on the deck...)</b>.<br> (Yes -- that is snow on the deck...)</b>.<br>
@ -48,5 +48,6 @@
size="2">2001, 2002 Thomas M. Eastep.</font></a></p> size="2">2001, 2002 Thomas M. Eastep.</font></a></p>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

12
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@ -12,11 +12,10 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Shorewall Certificate Authority <h1 align="center"><font color="#ffffff">Shorewall Certificate Authority
(CA) Certificate</font></h1> (CA) Certificate</font></h1>
</td> </td>
@ -72,8 +71,8 @@ so that it will accept any certificate signed by me. <br>
<li>If you install my CA certificate then you assume that I am trustworthy <li>If you install my CA certificate then you assume that I am trustworthy
and that Shorewall running on your firewall won't redirect HTTPS requests and that Shorewall running on your firewall won't redirect HTTPS requests
intented to go to your bank's server to one of my systems that will present intented to go to your bank's server to one of my systems that will present
your browser with a bogus certificate claiming that my server is that of your your browser with a bogus certificate claiming that my server is that of
bank.</li> your bank.</li>
<li>If you only accept my server's certificate when prompted then the <li>If you only accept my server's certificate when prompted then the
most that you have to loose is that when you connect to https://mail.shorewall.net, most that you have to loose is that when you connect to https://mail.shorewall.net,
the server you are connecting to might not be mine.</li> the server you are connecting to might not be mine.</li>
@ -85,8 +84,9 @@ won't be offended if you decline to load it into yours... :-)<br>
<p align="left"><font size="2">Last Updated 1/17/2003 - Tom Eastep</font></p> <p align="left"><font size="2">Last Updated 1/17/2003 - Tom Eastep</font></p>
<p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font <p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font
size="2">Copyright</font> &copy; <font size="2">2001, 2002, 2003 Thomas size="2">Copyright</font> &copy; <font size="2">2001, 2002, 2003 Thomas M.
M. Eastep.</font></a></font></p> Eastep.</font></a></font></p>
<br>
<br> <br>
<br> <br>
<br> <br>

7
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@ -12,7 +12,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -27,8 +27,8 @@
<br> <br>
Lots of people try to download the entire Shorewall website for off-line Lots of people try to download the entire Shorewall website for off-line
browsing, including the CVS portion. In addition to being an enormous volume browsing, including the CVS portion. In addition to being an enormous volume
of data (HTML versions of all versions of all Shorewall files), all of of data (HTML versions of all versions of all Shorewall files), all of the
the pages in Shorewall CVS access are cgi-generated which places a tremendous pages in Shorewall CVS access are cgi-generated which places a tremendous
load on my little server. I have therefore resorted to making CVS access load on my little server. I have therefore resorted to making CVS access
password controlled. When you are asked to log in, enter "Shorewall" (NOTE password controlled. When you are asked to log in, enter "Shorewall" (NOTE
THE CAPITALIZATION!!!!!) for both the user name and the password.<br> THE CAPITALIZATION!!!!!) for both the user name and the password.<br>
@ -52,5 +52,6 @@ the pages in Shorewall CVS access are cgi-generated which places a tremendous
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

6
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@ -16,13 +16,14 @@
</small> <small> </small> </small> <small> </small>
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4" style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"><small> </small> <td width="100%"><small> </small>
<h1 align="center"><small><font color="#ffffff">Some things that Shorewall <h1 align="center"><small><font color="#ffffff">Some things that Shorewall
<b>Cannot</b> Do</font></small></h1> <b>Cannot</b> Do</font></small></h1>
<small> </small></td> <small>
</small></td>
</tr> </tr>
</tbody> </tbody>
@ -46,5 +47,6 @@
</p> </p>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

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@ -11,20 +11,23 @@
<body> <body>
<table cellpadding="0" cellspacing="0" border="0" width="100%" <table cellpadding="0" cellspacing="0" border="0" width="100%"
bgcolor="#400169"> bgcolor="#3366ff">
<tbody> <tbody>
<tr> <tr>
<td valign="middle" width="33%" bgcolor="#400169"><a <td valign="middle" width="33%" bgcolor="#3366ff"><a
href="http://www.squid-cache.org/"><img src="images/squidnow.gif" href="http://www.squid-cache.org/"><img src="images/squidnow.gif"
alt="" width="88" height="31" hspace="4"> alt="" width="88" height="31" hspace="4">
</a><br> </a><br>
</td> </td>
<td valign="middle" height="90" align="center" width="34%"><font <td valign="middle" height="90" align="center"
color="#ffffff"><b><big><big><big><big>Using Shorewall with Squid</big></big></big></big></b></font><br> width="34%">
<h1><font color="#ffffff"><b>Using Shorewall with Squid</b></font></h1>
<h1> </h1>
</td> </td>
<td valign="middle" height="90" width="33%" align="right"><a <td valign="middle" height="90" width="33%"
href="http://www.squid-cache.org/"><img src="images/cache_now.gif" align="right"><a href="http://www.squid-cache.org/"><img
alt="" width="100" height="31" hspace="4"> src="images/cache_now.gif" alt="" width="100" height="31" hspace="4">
</a><br> </a><br>
</td> </td>
</tr> </tr>
@ -36,7 +39,7 @@
href="http://www.squid-cache.org/">Squid </a>running as a <u><b>Transparent href="http://www.squid-cache.org/">Squid </a>running as a <u><b>Transparent
Proxy</b></u>. If you are running Shorewall 1.3, please see <a Proxy</b></u>. If you are running Shorewall 1.3, please see <a
href="1.3/Shorewall_Squid_Usage.html">this documentation</a>.<br> href="1.3/Shorewall_Squid_Usage.html">this documentation</a>.<br>
<a href="#DMZ"></a><br> <br>
<img border="0" src="images/j0213519.gif" width="60" <img border="0" src="images/j0213519.gif" width="60"
height="60" alt="Caution" align="middle"> height="60" alt="Caution" align="middle">
&nbsp;&nbsp;&nbsp; Please observe the following general requirements:<br> &nbsp;&nbsp;&nbsp; Please observe the following general requirements:<br>
@ -44,35 +47,36 @@
<b><img src="images/BD21298_3.gif" alt="" width="13" <b><img src="images/BD21298_3.gif" alt="" width="13"
height="13"> height="13">
&nbsp;&nbsp;&nbsp; </b>In all cases, Squid should be configured &nbsp;&nbsp;&nbsp; </b>In all cases, Squid should be configured
to run as a transparent proxy as described at <a to run as a transparent proxy as described at <a
href="http://www.tldp.org/HOWTO/mini/TransparentProxy-4.html">http://www.tldp.org/HOWTO/mini/TransparentProxy-4.html</a>.<br> href="http://www.tldp.org/HOWTO/mini/TransparentProxy-4.html">http://www.tldp.org/HOWTO/mini/TransparentProxy-4.html</a>.<br>
<b><br> <b><br>
</b><b><img src="images/BD21298_3.gif" alt="" width="13" </b><b><img src="images/BD21298_3.gif" alt="" width="13"
height="13"> height="13">
&nbsp;&nbsp;&nbsp; </b>The following instructions mention the files &nbsp;&nbsp;&nbsp; </b>The following instructions mention the
/etc/shorewall/start and /etc/shorewall/init -- if you don't have those files /etc/shorewall/start and /etc/shorewall/init -- if you don't have
files, siimply create them.<br> those files, siimply create them.<br>
<br> <br>
<b><img src="images/BD21298_3.gif" alt="" width="13" <b><img src="images/BD21298_3.gif" alt="" width="13"
height="13"> height="13">
</b>&nbsp;&nbsp;&nbsp; When the Squid server is in the DMZ zone </b>&nbsp;&nbsp;&nbsp; When the Squid server is in the DMZ
or in the local zone, that zone must be defined ONLY by its interface zone or in the local zone, that zone must be defined ONLY by its interface
-- no /etc/shorewall/hosts file entries. That is because the packets being -- no /etc/shorewall/hosts file entries. That is because the packets being
routed to the Squid server still have their original destination IP addresses.<br> routed to the Squid server still have their original destination IP
addresses.<br>
<br> <br>
<b><img src="images/BD21298_3.gif" alt="" width="13" <b><img src="images/BD21298_3.gif" alt="" width="13"
height="13"> height="13">
</b>&nbsp;&nbsp;&nbsp; You must have iptables installed on your </b>&nbsp;&nbsp;&nbsp; You must have iptables installed on
Squid server.<br> your Squid server.<br>
<br> <br>
<b><img src="images/BD21298_3.gif" alt="" width="13" <b><img src="images/BD21298_3.gif" alt="" width="13"
height="13"> height="13">
</b>&nbsp;&nbsp;&nbsp; If you run a Shorewall version earlier </b>&nbsp;&nbsp;&nbsp; If you run a Shorewall version earlier
than 1.4.6, you must have NAT and MANGLE enabled in your /etc/shorewall/conf than 1.4.6, you must have NAT and MANGLE enabled in your /etc/shorewall/conf
file<br> file<br>
<br> <br>
&nbsp;&nbsp;&nbsp; <b><font color="#009900">&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <b><font color="#009900">&nbsp;&nbsp;&nbsp;
NAT_ENABLED=Yes<br> NAT_ENABLED=Yes<br>
</font></b>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <font </font></b>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <font
color="#009900"><b>MANGLE_ENABLED=Yes</b></font><br> color="#009900"><b>MANGLE_ENABLED=Yes</b></font><br>
<br> <br>
@ -82,9 +86,9 @@ NAT_ENABLED=Yes<br>
<li><a href="Shorewall_Squid_Usage.html#Firewall">Squid running <li><a href="Shorewall_Squid_Usage.html#Firewall">Squid running
on the Firewall.</a></li> on the Firewall.</a></li>
<li><a href="Shorewall_Squid_Usage.html#Local">Squid running <li><a href="Shorewall_Squid_Usage.html#Local">Squid running
in the local network</a></li> in the local network</a></li>
<li><a href="Shorewall_Squid_Usage.html#DMZ">Squid running in <li><a href="Shorewall_Squid_Usage.html#DMZ">Squid running
the DMZ</a></li> in the DMZ</a></li>
</ol> </ol>
@ -94,7 +98,7 @@ the DMZ</a></li>
http server (206.124.146.177) http server (206.124.146.177)
to a Squid to a Squid
transparent proxy running on the firewall and listening on port transparent proxy running on the firewall and listening on port
3128. Squid will of course require access to remote web servers.<br> 3128. Squid will of course require access to remote web servers.<br>
<br> <br>
In /etc/shorewall/rules:<br> In /etc/shorewall/rules:<br>
<br> <br>
@ -141,23 +145,23 @@ the DMZ</a></li>
<br> <br>
</blockquote> </blockquote>
There may be a requirement to exclude additional destination hosts There may be a requirement to exclude additional destination hosts
or networks from being redirected. For example, you might also want requests or networks from being redirected. For example, you might also want requests
destined for 130.252.100.0/24 to not be routed to Squid. In that case, you destined for 130.252.100.0/24 to not be routed to Squid. In that case,
must add a manual rule in /etc/shorewall/start:<br> you must add a manual rule in /etc/shorewall/start:<br>
<blockquote> <blockquote>
<pre>run_iptables -t nat -I loc_dnat -p tcp --dport www -d 130.252.100.0/24 -j RETURN<br></pre> <pre>run_iptables -t nat -I loc_dnat -p tcp --dport www -d 130.252.100.0/24 -j RETURN<br></pre>
</blockquote> </blockquote>
&nbsp;To exclude additional hosts or networks, just add additional similar &nbsp;To exclude additional hosts or networks, just add additional similar
rules.<br> rules.<br>
<h2><a name="Local"></a>Squid Running in the local network</h2> <h2><a name="Local"></a>Squid Running in the local network</h2>
You want to redirect all local www connection requests to a You want to redirect all local www connection requests to
Squid transparent a Squid transparent
proxy running in your local zone at 192.168.1.3 and listening on port proxy running in your local zone at 192.168.1.3 and listening on
3128. Your local interface is eth1. There may also be a web server running port 3128. Your local interface is eth1. There may also be a web server
on 192.168.1.3. It is assumed that web access is already enabled from running on 192.168.1.3. It is assumed that web access is already enabled
the local zone to the internet.<br> from the local zone to the internet.<br>
<p><font color="#ff0000"><b>WARNING: </b></font>This setup may conflict with <p><font color="#ff0000"><b>WARNING: </b></font>This setup may conflict with
other aspects of your gateway including but not limited to traffic other aspects of your gateway including but not limited to traffic
@ -187,7 +191,7 @@ it</b>.<br>
<ul> <ul>
<li>If you are running Shorewall 1.4.1 or Shorewall 1.4.1a, <li>If you are running Shorewall 1.4.1 or Shorewall 1.4.1a,
please upgrade to Shorewall 1.4.2 or later.<br> please upgrade to Shorewall 1.4.2 or later.<br>
<br> <br>
</li> </li>
<li>If you are running Shorewall 1.4.2 or later, then in /etc/shorewall/interfaces:<br> <li>If you are running Shorewall 1.4.2 or later, then in /etc/shorewall/interfaces:<br>
@ -255,8 +259,8 @@ please upgrade to Shorewall 1.4.2 or later.<br>
</table> </table>
</li> </li>
<br> <br>
<li>Alternativfely, if you are running Shorewall 1.4.0 you can have the <li>Alternativfely, if you are running Shorewall 1.4.0 you can have
following policy in place of the above rule:<br> the following policy in place of the above rule:<br>
<table cellpadding="2" cellspacing="0" border="1"> <table cellpadding="2" cellspacing="0" border="1">
<tbody> <tbody>
@ -299,8 +303,8 @@ please upgrade to Shorewall 1.4.2 or later.<br>
</blockquote> </blockquote>
<ul> <ul>
<li>On 192.168.1.3, arrange for the following command to be <li>On 192.168.1.3, arrange for the following command to
executed after networking has come up<br> be executed after networking has come up<br>
<pre><b><font color="#009900">iptables -t nat -A PREROUTING -i eth0 -d ! 192.168.1.3 -p tcp --dport 80 -j REDIRECT --to-ports 3128</font></b><br></pre> <pre><b><font color="#009900">iptables -t nat -A PREROUTING -i eth0 -d ! 192.168.1.3 -p tcp --dport 80 -j REDIRECT --to-ports 3128</font></b><br></pre>
</li> </li>
@ -321,9 +325,9 @@ executed after networking has come up<br>
<blockquote> </blockquote> <blockquote> </blockquote>
<h2><a name="DMZ"></a>Squid Running in the DMZ (This is what I do)</h2> <h2><a name="DMZ"></a>Squid Running in the DMZ (This is what I do)</h2>
You have a single Linux system in your DMZ with IP address 192.0.2.177. You have a single Linux system in your DMZ with IP address
You want to run both a web server and Squid on that system. Your DMZ 192.0.2.177. You want to run both a web server and Squid on that system.
interface is eth1 and your local interface is eth2.<br> Your DMZ interface is eth1 and your local interface is eth2.<br>
<ul> <ul>
<li>On your firewall system, issue the following command<br> <li>On your firewall system, issue the following command<br>
@ -397,7 +401,8 @@ interface is eth1 and your local interface is eth2.<br>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
C) Run Shorewall 1.3.14 or later and add the following entry in /etc/shorewall/tcrules:<br> C) Run Shorewall 1.3.14 or later and add the following entry in
/etc/shorewall/tcrules:<br>
</blockquote> </blockquote>
<blockquote> <blockquote>
@ -504,8 +509,8 @@ interface is eth1 and your local interface is eth2.<br>
</blockquote> </blockquote>
<ul> <ul>
<li>On 192.0.2.177 (your Web/Squid server), arrange for the <li>On 192.0.2.177 (your Web/Squid server), arrange for
following command to be executed after networking has come up<br> the following command to be executed after networking has come up<br>
<pre><font color="#009900"><b>iptables -t nat -A PREROUTING -i eth0 -d ! 192.0.2.177 -p tcp --dport 80 -j REDIRECT --to-ports 3128</b></font><br></pre> <pre><font color="#009900"><b>iptables -t nat -A PREROUTING -i eth0 -d ! 192.0.2.177 -p tcp --dport 80 -j REDIRECT --to-ports 3128</b></font><br></pre>
</li> </li>
@ -528,7 +533,10 @@ following command to be executed after networking has come up<br>
<p><font size="-1"> Updated 6/27/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="-1"> Updated 6/27/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
<a href="copyright.htm"><font size="2">Copyright</font> &copy; <a href="copyright.htm"><font size="2">Copyright</font>
<font size="2">2003 Thomas M. Eastep.</font></a><br> &copy; <font size="2">2003 Thomas M. Eastep.</font></a><br>
<br>
<br>
</body> </body>
</html> </html>

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@ -12,10 +12,11 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Shorewall and Aliased Interfaces</font></h1> <h1 align="center"><font color="#ffffff">Shorewall and Aliased Interfaces</font></h1>
</td> </td>
</tr> </tr>
@ -26,27 +27,27 @@
<h2>Background</h2> <h2>Background</h2>
The traditional net-tools contain a program called <i>ifconfig</i> The traditional net-tools contain a program called <i>ifconfig</i>
which is used to configure network devices. ifconfig introduced the concept which is used to configure network devices. ifconfig introduced the concept
of <i>aliased </i>or <i>virtial </i>interfaces. These virtual interfaces of <i>aliased </i>or <i>virtial </i>interfaces. These virtual interfaces
have names of the form <i>interface</i>:<i>integer </i>(e.g., eth0:0) and have names of the form <i>interface</i>:<i>integer </i>(e.g., eth0:0)
ifconfig treats them more or less like real interfaces.<br> and ifconfig treats them more or less like real interfaces.<br>
<br> <br>
Example:<br> Example:<br>
<pre>[root@gateway root]# ifconfig eth0:0<br>eth0:0 Link encap:Ethernet HWaddr 02:00:08:3:FA:55<br> inet addr:206.124.146.178 Bcast:206.124.146.255 Mask:255.255.255.0<br> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<br> Interrupt:11 Base address:0x2000<br>[root@gateway root]# <br></pre> <pre>[root@gateway root]# ifconfig eth0:0<br>eth0:0 Link encap:Ethernet HWaddr 02:00:08:3:FA:55<br> inet addr:206.124.146.178 Bcast:206.124.146.255 Mask:255.255.255.0<br> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1<br> Interrupt:11 Base address:0x2000<br>[root@gateway root]# <br></pre>
The ifconfig utility is being gradually phased out in favor of the The ifconfig utility is being gradually phased out in favor of the
<i>ip</i> utility which is part of the <i>iproute </i>package. The ip <i>ip</i> utility which is part of the <i>iproute </i>package. The ip utility
utility does not use the concept of aliases or virtual interfaces but rather does not use the concept of aliases or virtual interfaces but rather treats
treats additional addresses on an interface as objects. The ip utility additional addresses on an interface as objects. The ip utility does provide
does provide for interaction with ifconfig in that it allows addresses for interaction with ifconfig in that it allows addresses to be <i>labeled
to be <i>labeled </i>and labels may take the form of ipconfig virtual interfaces.<br> </i>and labels may take the form of ipconfig virtual interfaces.<br>
<br> <br>
Example:<br> Example:<br>
<br> <br>
<pre>[root@gateway root]# ip addr show dev eth0<br>2: eth0: &lt;BROADCAST,MULTICAST,UP&gt; mtu 1500 qdisc htb qlen 100<br> link/ether 02:00:08:e3:fa:55 brd ff:ff:ff:ff:ff:ff<br> inet 206.124.146.176/24 brd 206.124.146.255 scope global eth0<br> inet 206.124.146.178/24 brd 206.124.146.255 scope global secondary eth0:0<br>[root@gateway root]# <br></pre> <pre>[root@gateway root]# ip addr show dev eth0<br>2: eth0: &lt;BROADCAST,MULTICAST,UP&gt; mtu 1500 qdisc htb qlen 100<br> link/ether 02:00:08:e3:fa:55 brd ff:ff:ff:ff:ff:ff<br> inet 206.124.146.176/24 brd 206.124.146.255 scope global eth0<br> inet 206.124.146.178/24 brd 206.124.146.255 scope global secondary eth0:0<br>[root@gateway root]# <br></pre>
Note that one <u>cannot</u> type "ip addr show dev eth0:0" because Note that one <u>cannot</u> type "ip addr show dev eth0:0" because
"eth0:0" is a label for a particular address rather than a device name.<br> "eth0:0" is a label for a particular address rather than a device name.<br>
<pre>[root@gateway root]# ip addr show dev eth0:0<br>Device "eth0:0" does not exist.<br>[root@gateway root]#<br></pre> <pre>[root@gateway root]# ip addr show dev eth0:0<br>Device "eth0:0" does not exist.<br>[root@gateway root]#<br></pre>
The iptables program doesn't support virtual interfaces in either The iptables program doesn't support virtual interfaces in either
@ -109,8 +110,8 @@ with the IP address.<br>
<h3>DNAT</h3> <h3>DNAT</h3>
Suppose that I had set up eth0:0 as above and I wanted to port forward Suppose that I had set up eth0:0 as above and I wanted to port forward
from that virtual interface to a web server running in my local zone at from that virtual interface to a web server running in my local zone
192.168.1.3. That is accomplised by a single rule in the /etc/shorewall/rules at 192.168.1.3. That is accomplised by a single rule in the /etc/shorewall/rules
file:<br> file:<br>
<br> <br>
@ -185,11 +186,11 @@ with the IP address.<br>
<br> <br>
</blockquote> </blockquote>
Shorewall can create the alias (additional address) for you if you Shorewall can create the alias (additional address) for you if you
set ADD_SNAT_ALIASES=Yes in /etc/shorewall/shorewall.conf. Beginning with set ADD_SNAT_ALIASES=Yes in /etc/shorewall/shorewall.conf. Beginning
Shorewall 1.3.14, Shorewall can actually create the "label" (virtual interface) with Shorewall 1.3.14, Shorewall can actually create the "label" (virtual
so that you can see the created address using ifconfig. In addition to interface) so that you can see the created address using ifconfig. In
setting ADD_SNAT_ALIASES=Yes, you specify the virtual interface name in addition to setting ADD_SNAT_ALIASES=Yes, you specify the virtual interface
the INTERFACE column as follows:<br> name in the INTERFACE column as follows:<br>
<blockquote> <blockquote>
<table cellpadding="2" cellspacing="0" border="1"> <table cellpadding="2" cellspacing="0" border="1">
@ -214,12 +215,13 @@ the INTERFACE column as follows:<br>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
Shorewall can also set up SNAT to round-robin over a range of IP addresses. Shorewall can also set up SNAT to round-robin over a range of IP addresses.
Do do that, you specify a range of IP addresses in the ADDRESS column. If Do do that, you specify a range of IP addresses in the ADDRESS column. If
you specify a label in the INTERFACE column, Shorewall will use that label you specify a label in the INTERFACE column, Shorewall will use that label
for the first address of the range and will increment the label by one for for the first address of the range and will increment the label by one for
each subsequent label.<br> each subsequent label.<br>
<br> <br>
<blockquote> <blockquote>
<table cellpadding="2" cellspacing="0" border="1"> <table cellpadding="2" cellspacing="0" border="1">
<tbody> <tbody>
@ -243,11 +245,11 @@ each subsequent label.<br>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
The above would create three IP addresses:<br> The above would create three IP addresses:<br>
<br> <br>
&nbsp;&nbsp;&nbsp; eth0:0 = 206.124.146.178<br> &nbsp;&nbsp;&nbsp; eth0:0 = 206.124.146.178<br>
&nbsp;&nbsp;&nbsp; eth0:1 = 206.124.146.179<br> &nbsp;&nbsp;&nbsp; eth0:1 = 206.124.146.179<br>
&nbsp;&nbsp;&nbsp; eth0:2 = 206.124.146.180<br> &nbsp;&nbsp;&nbsp; eth0:2 = 206.124.146.180<br>
<h3>STATIC NAT</h3> <h3>STATIC NAT</h3>
If you wanted to use static NAT to link eth0:0 with local address If you wanted to use static NAT to link eth0:0 with local address
@ -287,11 +289,11 @@ The above would create three IP addresses:<br>
<br> <br>
</blockquote> </blockquote>
Shorewall can create the alias (additional address) for you if you Shorewall can create the alias (additional address) for you if you
set ADD_IP_ALIASES=Yes in /etc/shorewall/shorewall.conf. Beginning with set ADD_IP_ALIASES=Yes in /etc/shorewall/shorewall.conf. Beginning with
Shorewall 1.3.14, Shorewall can actually create the "label" (virtual interface) Shorewall 1.3.14, Shorewall can actually create the "label" (virtual
so that you can see the created address using ifconfig. In addition to interface) so that you can see the created address using ifconfig. In
setting ADD_IP_ALIASES=Yes, you specify the virtual interface name in the addition to setting ADD_IP_ALIASES=Yes, you specify the virtual interface
INTERFACE column as follows:<br> name in the INTERFACE column as follows:<br>
<br> <br>
<blockquote> <blockquote>
@ -327,7 +329,7 @@ INTERFACE column as follows:<br>
<br> <br>
</blockquote> </blockquote>
In either case, to create rules that pertain only to this NAT pair, In either case, to create rules that pertain only to this NAT pair,
you simply qualify the local zone with the internal IP address.<br> you simply qualify the local zone with the internal IP address.<br>
<br> <br>
Example: You want to allow SSH from the net to 206.124.146.178 a.k.a. Example: You want to allow SSH from the net to 206.124.146.178 a.k.a.
192.168.1.3.<br> 192.168.1.3.<br>
@ -384,9 +386,9 @@ you simply qualify the local zone with the internal IP address.<br>
as a zone and allow your firewall/router to route between the two subnetworks.<br> as a zone and allow your firewall/router to route between the two subnetworks.<br>
<br> <br>
Example 1: &nbsp;Local interface eth1 interfaces to 192.168.1.0/24 Example 1: &nbsp;Local interface eth1 interfaces to 192.168.1.0/24
and 192.168.20.0/24. The primary IP address of eth1 is 192.168.1.254 and and 192.168.20.0/24. The primary IP address of eth1 is 192.168.1.254
eth1:0 is 192.168.20.254. You want to simply route all requests between and eth1:0 is 192.168.20.254. You want to simply route all requests between
the two subnetworks.<br> the two subnetworks.<br>
<h4>If you are running Shorewall 1.4.1 or Later</h4> <h4>If you are running Shorewall 1.4.1 or Later</h4>
In /etc/shorewall/interfaces:<br> In /etc/shorewall/interfaces:<br>
@ -527,11 +529,11 @@ the two subnetworks.<br>
</table> </table>
<br> <br>
</blockquote> </blockquote>
Example 2: Local interface eth1 interfaces to 192.168.1.0/24 and 192.168.20.0/24. Example 2: Local interface eth1 interfaces to 192.168.1.0/24 and
The primary IP address of eth1 is 192.168.1.254 and eth1:0 is 192.168.20.254. 192.168.20.0/24. The primary IP address of eth1 is 192.168.1.254 and
You want to make these subnetworks into separate zones and control the eth1:0 is 192.168.20.254. You want to make these subnetworks into separate
access between them (the users of the systems do not have administrative zones and control the access between them (the users of the systems do
privileges).<br> not have administrative privileges).<br>
<br> <br>
In /etc/shorewall/zones:<br> In /etc/shorewall/zones:<br>
<br> <br>
@ -645,6 +647,7 @@ the two subnetworks.<br>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <p><a href="copyright.htm"><font size="2">Copyright</font> &copy;
<font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
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@ -20,18 +20,20 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#4b017c" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%" <td
height="90"> width="100%" height="90">
<h3 align="center"><font color="#ffffff">Shorewall</font></h3> <h3 align="center"><font color="#ffffff">Shorewall</font></h3>
</td> </td>
</tr> </tr>
<tr> <tr>
<td width="100%" <td
bgcolor="#ffffff"> width="100%" bgcolor="#ffffff">
<ul> <ul>
<li> <a <li> <a
@ -47,7 +49,8 @@
</li> </li>
<li> <a <li> <a
href="Install.htm">Installation/Upgrade/</a><br> href="Install.htm">Installation/Upgrade/</a><br>
<a href="Install.htm">Configuration</a><br> <a
href="Install.htm">Configuration</a><br>
</li> </li>
<li> <a <li> <a
href="shorewall_quickstart_guide.htm">QuickStart Guides (HOWTOs)</a><br> href="shorewall_quickstart_guide.htm">QuickStart Guides (HOWTOs)</a><br>
@ -94,7 +97,10 @@ Site</a></li>
target="_top">Chile</a></li> target="_top">Chile</a></li>
<li><a href="http://shorewall.greshko.com" <li><a href="http://shorewall.greshko.com"
target="_top">Taiwan</a></li> target="_top">Taiwan</a></li>
<li><a href="http://argentina.shorewall.net" target="_top">Argentina</a><br> <li><a href="http://argentina.shorewall.net"
target="_top">Argentina</a></li>
<li><a href="http://shorewall.securityopensource.org.br"
target="_top">Brazil</a><br>
</li> </li>
<li><a <li><a
href="http://www.shorewall.net" target="_top">Washington State, USA</a><br> href="http://www.shorewall.net" target="_top">Washington State, USA</a><br>
@ -141,5 +147,7 @@ Site</a></li>
size="2">2001-2003 Thomas M. Eastep.</font></a><br> size="2">2001-2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br> <br>
<br>
<br>
</body> </body>
</html> </html>

21
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@ -12,15 +12,15 @@
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="ProgId" content="FrontPage.Editor.Document">
<title>Shorewall Index</title> <title>Shorewall Index</title>
<base target="main"> <base
target="main">
<meta name="Microsoft Theme" content="none"> <meta name="Microsoft Theme" content="none">
</head> </head>
<body> <body>
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#4b017c" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%" <td width="100%"
@ -47,13 +47,15 @@
</li> </li>
<li> <a <li> <a
href="Install.htm">Installation/Upgrade/</a><br> href="Install.htm">Installation/Upgrade/</a><br>
<a href="Install.htm">Configuration</a><br> <a
href="Install.htm">Configuration</a><br>
</li> </li>
<li> <a <li> <a
href="shorewall_quickstart_guide.htm">QuickStart Guides (HOWTOs)</a><br> href="shorewall_quickstart_guide.htm">QuickStart Guides (HOWTOs)</a><br>
</li> </li>
<li>
<b><a href="shorewall_quickstart_guide.htm#Documentation">Documentation</a></b></li> <li> <b><a
href="shorewall_quickstart_guide.htm#Documentation">Documentation</a></b></li>
<li> <a href="FAQ.htm">FAQs</a></li> <li> <a href="FAQ.htm">FAQs</a></li>
<li><a <li><a
@ -93,7 +95,10 @@
target="_top">Chile</a></li> target="_top">Chile</a></li>
<li><a href="http://shorewall.greshko.com" <li><a href="http://shorewall.greshko.com"
target="_top">Taiwan</a></li> target="_top">Taiwan</a></li>
<li><a href="http://argentina.shorewall.net" target="_top">Argentina</a><br> <li><a href="http://argentina.shorewall.net"
target="_top">Argentina</a></li>
<li><a href="http://shorewall.securityopensource.org.br"
target="_top">Brazil</a><br>
</li> </li>
<li><a <li><a
href="http://www.shorewall.net" target="_top">Washington State, USA</a><br> href="http://www.shorewall.net" target="_top">Washington State, USA</a><br>
@ -140,5 +145,7 @@
size="2">2001-2003 Thomas M. Eastep.</font></a><br> size="2">2001-2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br> <br>
<br>
<br>
</body> </body>
</html> </html>

24
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -34,22 +34,21 @@ is shown in the following diagram:</p>
<p align="center"><img border="0" src="images/VPN.png" width="568" <p align="center"><img border="0" src="images/VPN.png" width="568"
height="796"> height="796">
</p> </p>
<p align="left">A system with an RFC 1918 address needs to access a remote <p align="left">A system with an RFC 1918 address needs to access a remote
network through a remote gateway. For this example, we will assume that network through a remote gateway. For this example, we will assume that the
the local system has IP address 192.168.1.12 and that the remote gateway local system has IP address 192.168.1.12 and that the remote gateway has
has IP address 192.0.2.224.</p> IP address 192.0.2.224.</p>
<p align="left">If PPTP is being used, there are no firewall requirements <p align="left">If PPTP is being used, there are no firewall requirements
beyond the default loc-&gt;net ACCEPT policy. There is one restriction however: beyond the default loc-&gt;net ACCEPT policy. There is one restriction however:
Only one local system at a time can be connected to a single remote gateway Only one local system at a time can be connected to a single remote gateway
unless you patch your kernel from the 'Patch-o-matic' patches available unless you patch your kernel from the 'Patch-o-matic' patches available at
at <a href="http://www.netfilter.org">http://www.netfilter.org</a>. </p> <a href="http://www.netfilter.org">http://www.netfilter.org</a>. </p>
<p align="left">If IPSEC is being used then only one system may connect to <p align="left">If IPSEC is being used then only one system may connect to
the remote gateway and there are firewall configuration requirements as the remote gateway and there are firewall configuration requirements as follows:</p>
follows:</p>
<blockquote> <blockquote>
<table border="1" cellpadding="2" style="border-collapse: collapse;" <table border="1" cellpadding="2" style="border-collapse: collapse;"
@ -89,16 +88,19 @@ follows:</p>
</table> </table>
</blockquote> </blockquote>
<p>If you want to be able to give access to all of your local systems to <p>If you want to be able to give access to all of your local systems to the
the remote network, you should consider running a VPN client on your firewall. remote network, you should consider running a VPN client on your firewall.
As starting points, see <a As starting points, see <a
href="http://www.shorewall.net/Documentation.htm#Tunnels"> http://www.shorewall.net/Documentation.htm#Tunnels</a> href="http://www.shorewall.net/Documentation.htm#Tunnels"> http://www.shorewall.net/Documentation.htm#Tunnels</a>
or <a href="http://www.shorewall.net/PPTP.htm">http://www.shorewall.net/PPTP.htm</a>.</p> or <a href="http://www.shorewall.net/PPTP.htm">http://www.shorewall.net/PPTP.htm</a>.</p>
<p><font size="2">Last modified 12/21/2002 - <a href="support.htm">Tom Eastep</a></font></p> <p><font size="2">Last modified 12/21/2002 - <a href="support.htm">Tom Eastep</a></font></p>
<p><font face="Trebuchet MS"><a href="copyright.htm"> <font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"> <font size="2">Copyright</font>
© <font size="2">2002 Thomas M. Eastep.</font></a></font></p> © <font size="2">2002 Thomas M. Eastep.</font></a></font></p>
<p> </p> <p> </p>
<br> <br>
<br>
</body> </body>
</html> </html>

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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -31,8 +31,7 @@
<h2>Static Blacklisting</h2> <h2>Static Blacklisting</h2>
<p>Shorewall static blacklisting support has the following configuration <p>Shorewall static blacklisting support has the following configuration parameters:</p>
parameters:</p>
<ul> <ul>
<li>You specify whether you want packets from blacklisted hosts dropped <li>You specify whether you want packets from blacklisted hosts dropped
@ -73,7 +72,7 @@ listed IP addresses to be rejected by the firewall.</li>
<li>show dynamic - displays the dynamic blacklisting configuration.</li> <li>show dynamic - displays the dynamic blacklisting configuration.</li>
</ul> </ul>
Dynamic blacklisting is <u>not</u> dependent on the "blacklist" option in Dynamic blacklisting is <u>not</u> dependent on the "blacklist" option in
/etc/shorewall/interfaces.<br> /etc/shorewall/interfaces.<br>
<p>Example 1:</p> <p>Example 1:</p>
@ -95,5 +94,6 @@ Dynamic blacklisting is <u>not</u> dependent on the "blacklist" option in
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -28,7 +28,7 @@
</table> </table>
<p><b><font color="#ff0000">Warning: </font>If you copy or edit your configuration <p><b><font color="#ff0000">Warning: </font>If you copy or edit your configuration
files on a system running Microsoft Windows, you <u>must</u> files on a system running Microsoft Windows, you <u>must</u>
run them through <a run them through <a
href="http://www.megaloman.com/%7Ehany/software/hd2u/"> dos2unix</a> href="http://www.megaloman.com/%7Ehany/software/hd2u/"> dos2unix</a>
before you use them with Shorewall.</b></p> before you use them with Shorewall.</b></p>
@ -38,8 +38,8 @@ files on a system running Microsoft Windows, you <u>must</u>
<p>Shorewall's configuration files are in the directory /etc/shorewall.</p> <p>Shorewall's configuration files are in the directory /etc/shorewall.</p>
<ul> <ul>
<li>/etc/shorewall/shorewall.conf - used to set <li>/etc/shorewall/shorewall.conf - used to
several firewall parameters.</li> set several firewall parameters.</li>
<li>/etc/shorewall/params - use this file to <li>/etc/shorewall/params - use this file to
set shell variables that you will expand in other files.</li> set shell variables that you will expand in other files.</li>
<li>/etc/shorewall/zones - partition the firewall's <li>/etc/shorewall/zones - partition the firewall's
@ -47,7 +47,7 @@ set shell variables that you will expand in other files.</li>
<li>/etc/shorewall/policy - establishes firewall <li>/etc/shorewall/policy - establishes firewall
high-level policy.</li> high-level policy.</li>
<li>/etc/shorewall/interfaces - describes the <li>/etc/shorewall/interfaces - describes the
interfaces on the firewall system.</li> interfaces on the firewall system.</li>
<li>/etc/shorewall/hosts - allows defining zones <li>/etc/shorewall/hosts - allows defining zones
in terms of individual hosts and subnetworks.</li> in terms of individual hosts and subnetworks.</li>
<li>/etc/shorewall/masq - directs the firewall <li>/etc/shorewall/masq - directs the firewall
@ -57,8 +57,9 @@ interfaces on the firewall system.</li>
<li>/etc/shorewall/modules - directs the firewall <li>/etc/shorewall/modules - directs the firewall
to load kernel modules.</li> to load kernel modules.</li>
<li>/etc/shorewall/rules - defines rules that <li>/etc/shorewall/rules - defines rules that
are exceptions to the overall policies established in /etc/shorewall/policy.</li> are exceptions to the overall policies established in /etc/shorewall/policy.</li>
<li>/etc/shorewall/nat - defines static NAT rules.</li> <li>/etc/shorewall/nat - defines static NAT
rules.</li>
<li>/etc/shorewall/proxyarp - defines use of <li>/etc/shorewall/proxyarp - defines use of
Proxy ARP.</li> Proxy ARP.</li>
<li>/etc/shorewall/routestopped (Shorewall 1.3.4 <li>/etc/shorewall/routestopped (Shorewall 1.3.4
@ -68,18 +69,18 @@ of packets for later use by traffic control/shaping or policy
routing.</li> routing.</li>
<li>/etc/shorewall/tos - defines rules for setting <li>/etc/shorewall/tos - defines rules for setting
the TOS field in packet headers.</li> the TOS field in packet headers.</li>
<li>/etc/shorewall/tunnels - defines IPSEC, GRE <li>/etc/shorewall/tunnels - defines IPSEC,
and IPIP tunnels with end-points on the firewall system.</li> GRE and IPIP tunnels with end-points on the firewall system.</li>
<li>/etc/shorewall/blacklist - lists blacklisted <li>/etc/shorewall/blacklist - lists blacklisted
IP/subnet/MAC addresses.</li> IP/subnet/MAC addresses.</li>
<li>/etc/shorewall/init - commands that you wish to execute at the <li>/etc/shorewall/init - commands that you wish to execute at
beginning of a "shorewall start" or "shorewall restart".</li> the beginning of a "shorewall start" or "shorewall restart".</li>
<li>/etc/shorewall/start - commands that you wish to execute at <li>/etc/shorewall/start - commands that you wish to execute at
the completion of a "shorewall start" or "shorewall restart"</li> the completion of a "shorewall start" or "shorewall restart"</li>
<li>/etc/shorewall/stop - commands that you wish to execute at the <li>/etc/shorewall/stop - commands that you wish to execute at
beginning of a "shorewall stop".</li> the beginning of a "shorewall stop".</li>
<li>/etc/shorewall/stopped - commands that you wish to execute at <li>/etc/shorewall/stopped - commands that you wish to execute
the completion of a "shorewall stop".</li> at the completion of a "shorewall stop".</li>
<li>/etc/shorewall/ecn - disable Explicit Congestion Notification (ECN <li>/etc/shorewall/ecn - disable Explicit Congestion Notification (ECN
- RFC 3168) to remote hosts or networks.<br> - RFC 3168) to remote hosts or networks.<br>
</li> </li>
@ -90,8 +91,8 @@ the completion of a "shorewall start" or "shorewall restart"</li>
<p>You may place comments in configuration files by making the first non-whitespace <p>You may place comments in configuration files by making the first non-whitespace
character a pound sign ("#"). You may also place comments character a pound sign ("#"). You may also place comments
at the end of any line, again by delimiting the comment from at the end of any line, again by delimiting the comment from the
the rest of the line with a pound sign.</p> rest of the line with a pound sign.</p>
<p>Examples:</p> <p>Examples:</p>
@ -110,11 +111,11 @@ the rest of the line with a pound sign.</p>
<h2><a name="INCLUDE"></a>IN<small><small></small></small>CLUDE Directive</h2> <h2><a name="INCLUDE"></a>IN<small><small></small></small>CLUDE Directive</h2>
Beginning with Shorewall version 1.4.2, any file may contain INCLUDE directives. Beginning with Shorewall version 1.4.2, any file may contain INCLUDE directives.
An INCLUDE directive consists of the word INCLUDE followed by a file name An INCLUDE directive consists of the word INCLUDE followed by a file name
and causes the contents of the named file to be logically included into and causes the contents of the named file to be logically included into
the file containing the INCLUDE. File names given in an INCLUDE directive the file containing the INCLUDE. File names given in an INCLUDE directive
are assumed to reside in /etc/shorewall or in an alternate configuration are assumed to reside in /etc/shorewall or in an alternate configuration
directory if one has been specified for the command.<br> directory if one has been specified for the command.<br>
<br> <br>
INCLUDE's may be nested to a level of 3 -- further nested INCLUDE directives INCLUDE's may be nested to a level of 3 -- further nested INCLUDE directives
are ignored with a warning message.<big><big><br> are ignored with a warning message.<big><big><br>
@ -186,8 +187,8 @@ directory if one has been specified for the command.<br>
<p align="left"><b>WARNING: I personally recommend strongly <u>against</u> <p align="left"><b>WARNING: I personally recommend strongly <u>against</u>
using DNS names in Shorewall configuration files. If you use DNS using DNS names in Shorewall configuration files. If you use DNS
names and you are called out of bed at 2:00AM because Shorewall won't names and you are called out of bed at 2:00AM because Shorewall won't
start as a result of DNS problems then don't say that you were not start as a result of DNS problems then don't say that you were not forewarned.
forewarned. <br> <br>
</b></p> </b></p>
<p align="left"><b>    -Tom<br> <p align="left"><b>    -Tom<br>
@ -197,8 +198,8 @@ forewarned. <br>
configuration files may be specified as either IP addresses or DNS configuration files may be specified as either IP addresses or DNS
Names.<br> Names.<br>
<br> <br>
DNS names in iptables rules aren't nearly as useful as DNS names in iptables rules aren't nearly as useful
they first appear. When a DNS name appears in a rule, the iptables as they first appear. When a DNS name appears in a rule, the iptables
utility resolves the name to one or more IP addresses and inserts utility resolves the name to one or more IP addresses and inserts
those addresses into the rule. So changes in the DNS-&gt;IP address those addresses into the rule. So changes in the DNS-&gt;IP address
relationship that occur after the firewall has started have absolutely relationship that occur after the firewall has started have absolutely
@ -217,16 +218,16 @@ forewarned. <br>
before starting your DNS server then your firewall won't start.<br> before starting your DNS server then your firewall won't start.<br>
</li> </li>
<li>Factors totally outside your control (your ISP's <li>Factors totally outside your control (your ISP's
router is down for example), can prevent your firewall from starting.</li> router is down for example), can prevent your firewall from starting.</li>
<li>You must bring up your network interfaces prior to <li>You must bring up your network interfaces prior
starting your firewall.<br> to starting your firewall.<br>
</li> </li>
</ul> </ul>
<p align="left"> Each DNS name much be fully qualified and include a minumum <p align="left"> Each DNS name much be fully qualified and include a minumum
of two periods (although one may be trailing). This restriction of two periods (although one may be trailing). This restriction is
is imposed by Shorewall to insure backward compatibility with existing imposed by Shorewall to insure backward compatibility with existing
configuration files.<br> configuration files.<br>
<br> <br>
Examples of valid DNS names:<br> Examples of valid DNS names:<br>
@ -259,9 +260,9 @@ is imposed by Shorewall to insure backward compatibility with existing
<h2><a name="Compliment"></a>Complementing an Address or Subnet</h2> <h2><a name="Compliment"></a>Complementing an Address or Subnet</h2>
<p>Where specifying an IP address, a subnet or an interface, you can precede <p>Where specifying an IP address, a subnet or an interface, you can precede
the item with "!" to specify the complement of the item. For example, the item with "!" to specify the complement of the item. For example,
!192.168.1.4 means "any host but 192.168.1.4". There must be no white space !192.168.1.4 means "any host but 192.168.1.4". There must be no white space
following the "!".</p> following the "!".</p>
<h2><a name="Lists"></a>Comma-separated Lists</h2> <h2><a name="Lists"></a>Comma-separated Lists</h2>
@ -272,10 +273,10 @@ following the "!".</p>
<li>Must not have any embedded white space.<br> <li>Must not have any embedded white space.<br>
Valid: routefilter,dhcp,norfc1918<br> Valid: routefilter,dhcp,norfc1918<br>
Invalid: routefilter,     dhcp,     Invalid: routefilter,     dhcp,    
norfc1818</li> norfc1818</li>
<li>If you use line continuation to break a comma-separated <li>If you use line continuation to break a
list, the continuation line(s) must begin in column 1 (or comma-separated list, the continuation line(s) must begin
there would be embedded white space)</li> in column 1 (or there would be embedded white space)</li>
<li>Entries in a comma-separated list may appear <li>Entries in a comma-separated list may appear
in any order.</li> in any order.</li>
@ -284,24 +285,24 @@ norfc1818</li>
<h2><a name="Ports"></a>Port Numbers/Service Names</h2> <h2><a name="Ports"></a>Port Numbers/Service Names</h2>
<p>Unless otherwise specified, when giving a port number you can use either <p>Unless otherwise specified, when giving a port number you can use either
an integer or a service name from /etc/services. </p> an integer or a service name from /etc/services. </p>
<h2><a name="Ranges"></a>Port Ranges</h2> <h2><a name="Ranges"></a>Port Ranges</h2>
<p>If you need to specify a range of ports, the proper syntax is &lt;<i>low <p>If you need to specify a range of ports, the proper syntax is &lt;<i>low
port number</i>&gt;:&lt;<i>high port number</i>&gt;. For port number</i>&gt;:&lt;<i>high port number</i>&gt;. For example,
example, if you want to forward the range of tcp ports 4000 through if you want to forward the range of tcp ports 4000 through 4100 to
4100 to local host 192.168.1.3, the entry in /etc/shorewall/rules is:<br> local host 192.168.1.3, the entry in /etc/shorewall/rules is:<br>
</p> </p>
<pre> DNAT net loc:192.168.1.3 tcp 4000:4100<br></pre> <pre> DNAT net loc:192.168.1.3 tcp 4000:4100<br></pre>
If you omit the low port number, a value of zero is assumed; if you omit If you omit the low port number, a value of zero is assumed; if you
the high port number, a value of 65535 is assumed.<br> omit the high port number, a value of 65535 is assumed.<br>
<h2><a name="Variables"></a>Using Shell Variables</h2> <h2><a name="Variables"></a>Using Shell Variables</h2>
<p>You may use the /etc/shorewall/params file to set shell variables <p>You may use the /etc/shorewall/params file to set shell variables
that you can then use in some of the other configuration files.</p> that you can then use in some of the other configuration files.</p>
<p>It is suggested that variable names begin with an upper case letter<font <p>It is suggested that variable names begin with an upper case letter<font
size="1"> </font>to distinguish them from variables used internally size="1"> </font>to distinguish them from variables used internally
@ -336,14 +337,14 @@ example, if you want to forward the range of tcp ports 4000 through
<p>Media Access Control (MAC) addresses can be used to specify packet <p>Media Access Control (MAC) addresses can be used to specify packet
source in several of the configuration files. To use this source in several of the configuration files. To use this
feature, your kernel must have MAC Address Match support (CONFIG_IP_NF_MATCH_MAC) feature, your kernel must have MAC Address Match support
included.</p> (CONFIG_IP_NF_MATCH_MAC) included.</p>
<p>MAC addresses are 48 bits wide and each Ethernet Controller has a unique <p>MAC addresses are 48 bits wide and each Ethernet Controller has a unique
MAC address.<br> MAC address.<br>
<br> <br>
In GNU/Linux, MAC addresses are usually written In GNU/Linux, MAC addresses are usually written
as a series of 6 hex numbers separated by colons. Example:<br> as a series of 6 hex numbers separated by colons. Example:<br>
<br> <br>
     [root@gateway root]# ifconfig eth0<br>      [root@gateway root]# ifconfig eth0<br>
     eth0 Link encap:Ethernet HWaddr <b><u>02:00:08:E3:FA:55</u></b><br>      eth0 Link encap:Ethernet HWaddr <b><u>02:00:08:E3:FA:55</u></b><br>
@ -393,15 +394,16 @@ shorewall start or shorewall restart command (e.g., <i><b>shorewall
-c /etc/testconfig restart</b></i> )</li> -c /etc/testconfig restart</b></i> )</li>
</ol> </ol>
The <a href="starting_and_stopping_shorewall.htm"><b>try</b> command</a> The <a href="starting_and_stopping_shorewall.htm"><b>try</b> command</a>
allows you to attempt to restart using an alternate configuration and if allows you to attempt to restart using an alternate configuration and if an
an error occurs to automatically restart the standard configuration.<br> error occurs to automatically restart the standard configuration.<br>
<p><font size="2"> Updated 6/29/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2"> Updated 6/29/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
© <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br> © <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br>
</p> </p>
<br>
</body> </body>
</html> </html>

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View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -41,5 +41,6 @@ A copy of the license is included in the section entitled "<a
 </p>  </p>
</blockquote> </blockquote>
<br> <br>
<br>
</body> </body>
</html> </html>

21
Shorewall-docs/dhcp.htm
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -31,16 +31,17 @@
<ul> <ul>
<li> <li>
<p align="left">Specify the "dhcp" option on each interface to be <p align="left">Specify the "dhcp" option on each interface to be served
served by your server in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> by your server in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file. This will generate rules that will allow DHCP to and from your file. This will generate rules that will allow DHCP to and from your firewall
firewall system. </p> system. </p>
</li> </li>
<li> <li>
<p align="left">When starting "dhcpd", you need to list those interfaces <p align="left">When starting "dhcpd", you need to list those interfaces
on the run line. On a RedHat system, this is done by modifying /etc/sysconfig/dhcpd. on the run line. On a RedHat system, this is done by modifying /etc/sysconfig/dhcpd.
</p> </p>
</li> </li>
</ul> </ul>
<h2 align="left">If a Firewall Interface gets its IP Address via DHCP</h2> <h2 align="left">If a Firewall Interface gets its IP Address via DHCP</h2>
@ -53,14 +54,14 @@ on the run line. On a RedHat system, this is done by modifying /etc/sysconfi
system. </p> system. </p>
</li> </li>
<li> <li>
<p align="left">If you know that the dynamic address is always going <p align="left">If you know that the dynamic address is always going to
to be in the same subnet, you can specify the subnet address in the interface's be in the same subnet, you can specify the subnet address in the interface's
entry in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> entry in the <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
file. </p> file. </p>
</li> </li>
<li> <li>
<p align="left">If you don't know the subnet address in advance, you <p align="left">If you don't know the subnet address in advance, you should
should specify "detect" for the interface's subnet address in the <a specify "detect" for the interface's subnet address in the <a
href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> file href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> file
and start Shorewall after the interface has started. </p> and start Shorewall after the interface has started. </p>
</li> </li>
@ -70,6 +71,7 @@ and start Shorewall after the interface has started. </p>
command to be executed when a new dynamic IP address gets assigned to command to be executed when a new dynamic IP address gets assigned to
the interface. Check your DHCP client's documentation. </p> the interface. Check your DHCP client's documentation. </p>
</li> </li>
</ul> </ul>
<p align="left"><font size="2">Last updated 11/03/2002 - <a <p align="left"><font size="2">Last updated 11/03/2002 - <a
@ -78,5 +80,6 @@ the interface. Check your DHCP client's documentation. </p>
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p> © <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p>
<br> <br>
<br>
</body> </body>
</html> </html>

34
Shorewall-docs/download.htm
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -53,13 +53,13 @@ for the configuration that most closely matches your own.<br>
<b> Linux PPC</b> or <b> TurboLinux</b> distribution <b> Linux PPC</b> or <b> TurboLinux</b> distribution
with a 2.4 kernel, you can use the RPM version (note: the with a 2.4 kernel, you can use the RPM version (note: the
RPM should also work with other distributions that store RPM should also work with other distributions that store
init scripts in /etc/init.d and that include chkconfig or init scripts in /etc/init.d and that include chkconfig
insserv). If you find that it works in other cases, let <a or insserv). If you find that it works in other cases, let <a
href="mailto:teastep@shorewall.net"> me</a> know so that href="mailto:teastep@shorewall.net"> me</a> know so that
I can mention them here. See the <a href="Install.htm">Installation I can mention them here. See the <a href="Install.htm">Installation
Instructions</a> if you have problems installing the RPM.</li> Instructions</a> if you have problems installing the RPM.</li>
<li>If you are running LRP, download the .lrp <li>If you are running LRP, download the .lrp
file (you might also want to download the .tgz so you will file (you might also want to download the .tgz so you will
have a copy of the documentation).</li> have a copy of the documentation).</li>
<li>If you run <a <li>If you run <a
href="http://www.debian.org"><b>Debian</b></a> and would href="http://www.debian.org"><b>Debian</b></a> and would
@ -89,8 +89,9 @@ have a copy of the documentation).</li>
<p><font color="#ff0000"><b>WARNING - YOU CAN <u>NOT</u> SIMPLY INSTALL <p><font color="#ff0000"><b>WARNING - YOU CAN <u>NOT</u> SIMPLY INSTALL
THE RPM AND ISSUE A "shorewall start" COMMAND. SOME CONFIGURATION THE RPM AND ISSUE A "shorewall start" COMMAND. SOME CONFIGURATION
IS REQUIRED BEFORE THE FIREWALL WILL START. Once you have completed configuration IS REQUIRED BEFORE THE FIREWALL WILL START. Once you have completed
of your firewall, you can enable startup by removing the file /etc/shorewall/startup_disabled.</b></font></p> configuration of your firewall, you can enable startup by removing
the file /etc/shorewall/startup_disabled.</b></font></p>
<p><b></b></p> <p><b></b></p>
@ -168,6 +169,17 @@ have a copy of the documentation).</li>
<td valign="top">N/A<br> <td valign="top">N/A<br>
</td> </td>
</tr> </tr>
<tr>
<td valign="top">Brazil<br>
</td>
<td valign="top">securityopensource.org.br<br>
</td>
<td valign="top"><a
href="http://shorewall.securityopensource.org.br/pub/shorewall/">Browse</a><br>
</td>
<td valign="top">N/A<br>
</td>
</tr>
<tr> <tr>
<td>Washington State, USA</td> <td>Washington State, USA</td>
<td>Shorewall.net</td> <td>Shorewall.net</td>
@ -198,13 +210,13 @@ find there will work at all.<br>
<blockquote> <blockquote>
<p align="left">Periodic snapshots from CVS may be found at <a <p align="left">Periodic snapshots from CVS may be found at <a
href="http://shorewall.net/pub/shorewall/Snapshots/">http://shorewall.net/pub/shorewall/Snapshots</a> href="http://shorewall.net/pub/shorewall/Snapshots/">http://shorewall.net/pub/shorewall/Snapshots</a>
(<a href="ftp://shorewall.net/pub/shorewall/Snapshots/" target="_top">FTP</a>). (<a href="ftp://shorewall.net/pub/shorewall/Snapshots/" target="_top">FTP</a>).
These snapshots have undergone initial testing and will have been installed These snapshots have undergone initial testing and will have been installed
and run at shorewall.net.<br> and run at shorewall.net.<br>
</p> </p>
</blockquote> </blockquote>
<p align="left"><font size="2">Last Updated 6/19/2003 - <a <p align="left"><font size="2">Last Updated 7/15/2003 - <a
href="support.htm">Tom Eastep</a></font></p> href="support.htm">Tom Eastep</a></font></p>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
@ -216,5 +228,7 @@ and run at shorewall.net.<br>
<br> <br>
<br> <br>
<br> <br>
<br>
<br>
</body> </body>
</html> </html>

105
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@ -6,6 +6,7 @@
content="text/html; charset=windows-1252"> content="text/html; charset=windows-1252">
<title>Shorewall 1.4 Errata</title> <title>Shorewall 1.4 Errata</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="ProgId" content="FrontPage.Editor.Document">
@ -18,7 +19,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -44,9 +45,9 @@
</li> </li>
<li> <li>
<p align="left"> <b>If you are installing Shorewall for the first <p align="left"> <b>If you are installing Shorewall for the
time and plan to use the .tgz and install.sh script, you can untar first time and plan to use the .tgz and install.sh script, you can
the archive, replace the 'firewall' script in the untarred directory untar the archive, replace the 'firewall' script in the untarred directory
with the one you downloaded below, and then run install.sh.</b></p> with the one you downloaded below, and then run install.sh.</b></p>
</li> </li>
<li> <li>
@ -58,9 +59,9 @@ the archive, replace the 'firewall' script in the untarred directory
<li> <li>
<p align="left"><b><font color="#ff0000">DO NOT INSTALL CORRECTED COMPONENTS <p align="left"><b><font color="#ff0000">DO NOT INSTALL CORRECTED COMPONENTS
ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER BELOW.
BELOW. For example, do NOT install the 1.3.9a firewall script if For example, do NOT install the 1.3.9a firewall script if you are
you are running 1.3.7c.</font></b><br> running 1.3.7c.</font></b><br>
</p> </p>
</li> </li>
@ -81,17 +82,17 @@ you are running 1.3.7c.</font></b><br>
color="#660066"><a href="#iptables"> Problem with iptables version 1.2.3 color="#660066"><a href="#iptables"> Problem with iptables version 1.2.3
on RH7.2</a></font></b></li> on RH7.2</a></font></b></li>
<li> <b><a <li> <b><a
href="#Debug">Problems with kernels &gt;= 2.4.18 and RedHat href="#Debug">Problems with kernels &gt;= 2.4.18 and
iptables</a></b></li> RedHat iptables</a></b></li>
<li><b><a href="#SuSE">Problems installing/upgrading <li><b><a href="#SuSE">Problems installing/upgrading
RPM on SuSE</a></b></li> RPM on SuSE</a></b></li>
<li><b><a href="#Multiport">Problems with <li><b><a href="#Multiport">Problems
iptables version 1.2.7 and MULTIPORT=Yes</a></b></li> with iptables version 1.2.7 and MULTIPORT=Yes</a></b></li>
<li><b><a href="#NAT">Problems with RH Kernel <li><b><a href="#NAT">Problems with RH Kernel
2.4.18-10 and NAT</a></b></li> 2.4.18-10 and NAT</a></b></li>
<li><b><a href="#REJECT">Problems with RH Kernels after 2.4.20-9 and REJECT <li><b><a href="#REJECT">Problems with RH Kernels after 2.4.20-9 and
(also applies to 2.4.21-RC1) <img src="images/new10.gif" alt="(New)" REJECT (also applies to 2.4.21-RC1) <img src="images/new10.gif"
width="28" height="12" border="0"> alt="(New)" width="28" height="12" border="0">
</a><br> </a><br>
</b></li> </b></li>
@ -106,11 +107,11 @@ iptables</a></b></li>
<ul> <ul>
<li>Shorewall is ignoring records in /etc/shorewall/routestopped that <li>Shorewall is ignoring records in /etc/shorewall/routestopped that
have an empty second column (HOSTS). This problem may be corrected by installing have an empty second column (HOSTS). This problem may be corrected by installing
<a <a
href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4b/firewall" href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4b/firewall"
target="_top">this firewall script</a> in /usr/share/shorewall/firewall as target="_top">this firewall script</a> in /usr/share/shorewall/firewall
described above.</li> as described above.</li>
<li>The INCLUDE directive doesn't work when placed in the /etc/shorewall/zones <li>The INCLUDE directive doesn't work when placed in the /etc/shorewall/zones
file. This problem may be corrected by installing <a file. This problem may be corrected by installing <a
href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4b/functions" href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4b/functions"
@ -127,8 +128,8 @@ file. This problem may be corrected by installing <a
href="FAQ.htm#faq16">FAQ 16</a>. This problem may be corrected by installing href="FAQ.htm#faq16">FAQ 16</a>. This problem may be corrected by installing
<a <a
href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4a/firewall" href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.4a/firewall"
target="_top">this firewall script</a> in /usr/share/shorewall/firewall as target="_top">this firewall script</a> in /usr/share/shorewall/firewall
described above.<br> as described above.<br>
</li> </li>
</ul> </ul>
@ -138,8 +139,8 @@ described above.<br>
<ul> <ul>
<li> If you have zone names that are 5 characters long, you may experience <li> If you have zone names that are 5 characters long, you may experience
problems starting Shorewall because the --log-prefix in a logging rule problems starting Shorewall because the --log-prefix in a logging rule is
is too long. Upgrade to Version 1.4.4a to fix this problem..</li> too long. Upgrade to Version 1.4.4a to fix this problem..</li>
</ul> </ul>
@ -148,10 +149,11 @@ is too long. Upgrade to Version 1.4.4a to fix this problem..</li>
<ul> <ul>
<li>The LOGMARKER variable introduced in version 1.4.3 was intended <li>The LOGMARKER variable introduced in version 1.4.3 was intended
to allow integration of Shorewall with Fireparse (http://www.firewparse.com). to allow integration of Shorewall with Fireparse (http://www.firewparse.com).
Unfortunately, LOGMARKER only solved part of the integration problem. I Unfortunately, LOGMARKER only solved part of the integration problem.
have implimented a new LOGFORMAT variable which will replace LOGMARKER which I have implimented a new LOGFORMAT variable which will replace LOGMARKER
has completely solved this problem and is currently in production with fireparse which has completely solved this problem and is currently in production
here at shorewall.net. The updated files may be found at <a with fireparse here at shorewall.net. The updated files may be found at
<a
href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.3/fireparse/" href="ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.3/fireparse/"
target="_top">ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.3/fireparse/</a>. target="_top">ftp://ftp1.shorewall.net/pub/shorewall/errata/1.4.3/fireparse/</a>.
See the 0README.txt file for details.<br> See the 0README.txt file for details.<br>
@ -162,12 +164,12 @@ has completely solved this problem and is currently in production with firepars
<h3>1.4.2</h3> <h3>1.4.2</h3>
<ul> <ul>
<li>When an 'add' or 'delete' command is executed, a temporary directory <li>When an 'add' or 'delete' command is executed, a temporary
created in /tmp is not being removed. This problem may be corrected by directory created in /tmp is not being removed. This problem may be corrected
installing <a by installing <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.4.2/firewall" href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.4.2/firewall"
target="_top">this firewall script</a> in /usr/share/shorewall/firewall as target="_top">this firewall script</a> in /usr/share/shorewall/firewall
described above. <br> as described above. <br>
</li> </li>
</ul> </ul>
@ -175,9 +177,9 @@ described above. <br>
<h3>1.4.1a, 1.4.1 and 1.4.0</h3> <h3>1.4.1a, 1.4.1 and 1.4.0</h3>
<ul> <ul>
<li>Some TCP requests are rejected in the 'common' chain with an <li>Some TCP requests are rejected in the 'common' chain with
ICMP port-unreachable response rather than the more appropriate TCP RST an ICMP port-unreachable response rather than the more appropriate TCP
response. This problem is corrected in <a RST response. This problem is corrected in <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.4.1a/common.def" href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.4.1a/common.def"
target="_top">this updated common.def file</a> which may be installed in target="_top">this updated common.def file</a> which may be installed in
/etc/shorewall/common.def.<br> /etc/shorewall/common.def.<br>
@ -234,7 +236,7 @@ to create ECN rules even when /etc/shorewall/ecn is empty. You may either
corrected 1.2.3 rpm which you can download here</a>  and corrected 1.2.3 rpm which you can download here</a>  and
I have also built an <a I have also built an <a
href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm"> href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm">
iptables-1.2.4 rpm which you can download here</a>. If you are currently iptables-1.2.4 rpm which you can download here</a>. If you are currently
running RedHat 7.1, you can install either of these RPMs running RedHat 7.1, you can install either of these RPMs
<b><u>before</u> </b>you upgrade to RedHat 7.2.</p> <b><u>before</u> </b>you upgrade to RedHat 7.2.</p>
@ -262,8 +264,8 @@ I have also built an <a
</ul> </ul>
</blockquote> </blockquote>
<h3><a name="Debug"></a>Problems with kernels &gt;= 2.4.18 and <h3><a name="Debug"></a>Problems with kernels &gt;= 2.4.18
RedHat iptables</h3> and RedHat iptables</h3>
<blockquote> <blockquote>
<p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19 <p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19
@ -288,7 +290,7 @@ RedHat iptables</h3>
<p>If you find that rpm complains about a conflict with kernel &lt;= <p>If you find that rpm complains about a conflict with kernel &lt;=
2.2 yet you have a 2.4 kernel installed, simply use the 2.2 yet you have a 2.4 kernel installed, simply use the
"--nodeps" option to rpm.</p> "--nodeps" option to rpm.</p>
<p>Installing: rpm -ivh --nodeps <i>&lt;shorewall rpm&gt;</i></p> <p>Installing: rpm -ivh --nodeps <i>&lt;shorewall rpm&gt;</i></p>
@ -299,12 +301,12 @@ RedHat iptables</h3>
<p>The iptables 1.2.7 release of iptables has made an incompatible <p>The iptables 1.2.7 release of iptables has made an incompatible
change to the syntax used to specify multiport match rules; change to the syntax used to specify multiport match rules;
as a consequence, if you install iptables 1.2.7 you must as a consequence, if you install iptables 1.2.7 you
be running Shorewall 1.3.7a or later or:</p> must be running Shorewall 1.3.7a or later or:</p>
<ul> <ul>
<li>set MULTIPORT=No <li>set
in /etc/shorewall/shorewall.conf; MULTIPORT=No in /etc/shorewall/shorewall.conf;
or </li> or </li>
<li>if you <li>if you
are running Shorewall 1.3.6 you may are running Shorewall 1.3.6 you may
@ -327,26 +329,27 @@ or </li>
<pre>Setting up NAT...<br>iptables: Invalid argument<br>Terminated<br><br></pre> <pre>Setting up NAT...<br>iptables: Invalid argument<br>Terminated<br><br></pre>
The solution is to put "no" in the LOCAL column. The solution is to put "no" in the LOCAL column.
Kernel support for LOCAL=yes has never worked properly and 2.4.18-10 Kernel support for LOCAL=yes has never worked properly and 2.4.18-10
has disabled it. The 2.4.19 kernel contains corrected support has disabled it. The 2.4.19 kernel contains corrected support under
under a new kernel configuraiton option; see <a a new kernel configuraiton option; see <a
href="Documentation.htm#NAT">http://www.shorewall.net/Documentation.htm#NAT</a><br> href="Documentation.htm#NAT">http://www.shorewall.net/Documentation.htm#NAT</a><br>
<br> <br>
<h3><a name="REJECT"></a><b> Problems with RH Kernels after 2.4.20-9 and REJECT <h3><a name="REJECT"></a><b> Problems with RH Kernels after 2.4.20-9 and
(also applies to 2.4.21-RC1)</b></h3> REJECT (also applies to 2.4.21-RC1)</b></h3>
Beginning with errata kernel 2.4.20-13.9, "REJECT --reject-with tcp-reset" Beginning with errata kernel 2.4.20-13.9, "REJECT --reject-with tcp-reset"
is broken. The symptom most commonly seen is that REJECT rules act just like is broken. The symptom most commonly seen is that REJECT rules act just
DROP rules when dealing with TCP. A kernel patch and precompiled modules to like DROP rules when dealing with TCP. A kernel patch and precompiled modules
fix this problem are available at <a to fix this problem are available at <a
href="ftp://ftp1.shorewall.net/pub/shorewall/errata/kernel" href="ftp://ftp1.shorewall.net/pub/shorewall/errata/kernel"
target="_top">ftp://ftp1.shorewall.net/pub/shorewall/errata/kernel</a>.<br> target="_top">ftp://ftp1.shorewall.net/pub/shorewall/errata/kernel</a>.<br>
<hr> <hr>
<p><font size="2"> Last updated 6/13/2003 - <a href="support.htm">Tom Eastep</a></font> <p><font size="2"> Last updated 6/13/2003 - <a href="support.htm">Tom
</p> Eastep</a></font> </p>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
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239
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@ -1,215 +1,196 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta http-equiv="Content-Type"
<title>Shorewall Errata for Version 1</title> content="text/html; charset=windows-1252">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>Shorewall Errata for Version 1</title>
</head> </head>
<body>
<body> <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#FFFFFF">Shorewall Errata for Version 1.1</font></h1> <h1 align="center"><font color="#ffffff">Shorewall Errata for Version
1.1</font></h1>
</td> </td>
</tr> </tr>
</tbody>
</table> </table>
<h3 align="Left"><font color="#660066"><u>To those of you who downloaded the 1.1.13 updated firewall script prior <h3 align="left"><font color="#660066"><u>To those of you who downloaded
to Sept 20, 2001:</u></font></h3> the 1.1.13 updated firewall script prior to Sept 20, 2001:</u></font></h3>
<blockquote> <blockquote>
<p align="left">Prior to 20:00 20 Sept 2001 GMT, the link under 1.1.13
<p align="Left">Prior pointed to a broken version of the firewall script. This has now been corrected.
to 20:00 20 Sept 2001 GMT, the link under 1.1.13 pointed to a broken version I apologize for any confusion this may have caused.</p>
of the firewall script. This has now been corrected. I apologize for any confusion
this may have caused.</p>
</blockquote> </blockquote>
<h3 align="Left">Version 1.1.18</h3> <h3 align="left">Version 1.1.18</h3>
<blockquote> <blockquote>
<p align="left">In the original .lrp, /etc/init.d/shorewall was not
<p align="Left">In the original .lrp, /etc/init.d/shorewall was not
secured for execute access. I have replaced the incorrect .lrp secured for execute access. I have replaced the incorrect .lrp
(shorwall-1.1.18.lrp) with a corrected one (shorwall-1.1.18a.lrp).</p> (shorwall-1.1.18.lrp) with a corrected one (shorwall-1.1.18a.lrp).</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.17</font></h3>
Version 1.1.17</font></h3>
<blockquote> <blockquote>
<p align="left">In shorewall.conf, ADD_IP_ALIASES was incorrectly
spelled IP_ADD_ALIASAES. There is a corrected version of the
file <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.17/shorewall.conf">here.</a></p>
<p align="Left">In <p align="left">This problem is also corrected in version 1.1.18.</p>
shorewall.conf, ADD_IP_ALIASES was incorrectly spelled
IP_ADD_ALIASAES. There is a corrected version of the file <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.17/shorewall.conf">here.</a></p>
<p align="Left">This
problem is also corrected in version 1.1.18.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.16</font></h3>
Version 1.1.16</font></h3>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> The ADD_IP_ALIASES variable added in 1.1.16 was incorrectly
The ADD_IP_ALIASES variable added in 1.1.16 was incorrectly spelled IP_ADD_ALIASES spelled IP_ADD_ALIASES in the firewall script. To correct this problem,
in the firewall script. To correct this problem, install the <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.16/firewall"> install the <a
corrected firewall script</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.16/firewall"> corrected
in the location pointed to by the symbolic link /etc/shorewall/firewall.</p> firewall script</a> in the location pointed to by the symbolic link
/etc/shorewall/firewall.</p>
<p align="Left"> <p align="left"> This problem is also corrected in version 1.1.17.</p>
This problem is also corrected in version 1.1.17.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.14-1.1.15</font></h3>
Version 1.1.14-1.1.15</font></h3>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> There are no corrections for these versions.</p>
There are no corrections for these versions.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.13</font></h3>
Version 1.1.13</font></h3>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> The firewall fails to start if a rule with the following
The firewall fails to start if a rule with the following format is given:</p> format is given:</p>
<p align="Left"> <p align="left"> &lt;disposition&gt;    z1:www.xxx.yyy.zzz    z2   
&lt;disposition&gt;    z1:www.xxx.yyy.zzz    z2    proto    p1,p2,p3</p> proto    p1,p2,p3</p>
<p align="Left"> <p align="left"> To correct this problem, install <a
To correct this problem, install <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.13/firewall"> href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.13/firewall"> this
this corrected firewall script</a> corrected firewall script</a> in the location pointed to by the symbolic
in the location pointed to by the symbolic link /etc/shorewall/firewall. </p> link /etc/shorewall/firewall. </p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.12</font></h3>
Version 1.1.12</font></h3>
<blockquote>
<p align="left"> The LRP version of Shorewall 1.1.12 has the incorrect
/etc/shorewall/functions file. This incorrect file results in many error
messages of the form:</p>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> separate_list: not found</p>
The LRP version of Shorewall 1.1.12 has the incorrect /etc/shorewall/functions
file. This incorrect file results in many error messages of the form:</p>
<blockquote>
<p align="Left">
separate_list: not found</p>
</blockquote> </blockquote>
<p align="Left"><a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.12/functions"> <p align="left"><a
The correct file may be obtained here</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.12/functions"> The
. This problem is also corrected in version 1.1.13.</p> correct file may be obtained here</a> . This problem is also corrected
in version 1.1.13.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.11</font></h3>
Version 1.1.11</font></h3>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> There are no known problems with this version.</p>
There are no known problems with this version.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.10</font></h3>
Version 1.1.10</font></h3>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> If the following conditions were met:<br>
If the following conditions were met:<br>
</p> </p>
<ol> <ol>
<li> <li>
<p align="Left"> <p align="left"> A LAN segment attached to the firewall was served
A LAN segment attached to the firewall was served by a DHCP server by a DHCP server running on the firewall.</p>
running on the firewall.</p>
</li> </li>
<li> <li>
<p align="Left"> <p align="left"> There were entries in /etc/shorewall/hosts that referred
There were entries in /etc/shorewall/hosts that referred to the to the interface to that LAN segment.</p>
interface to that LAN segment.</p>
</li> </li>
</ol> </ol>
<p align="Left"> <p align="left"> then up until now it has been necessary to include entries
then up until now it has been necessary to include entries for 0.0.0.0 for 0.0.0.0 and 255.255.255.255 for that interface in /etc/shorewall/hosts.
and 255.255.255.255 for that interface in /etc/shorewall/hosts. <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.10/firewall"> <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.10/firewall">
This version of the firewall script</a> This version of the firewall script</a> makes those additions unnecessary
makes those additions unnecessary provided that you simply include provided that you simply include "dhcp" in the options for the interface
"dhcp" in the options for the interface in /etc/shorewall/interfaces. in /etc/shorewall/interfaces. Install the script into the location pointed
Install the script into the location pointed to by the symbolic link to by the symbolic link /etc/shorewall/firewall.</p>
/etc/shorewall/firewall.</p>
<p align="Left"> <p align="left"> This problem has also been corrected in version 1.1.11.</p>
This problem has also been corrected in version 1.1.11.</p>
</blockquote> </blockquote>
<h3 align="Left"><font color="#660066"> <h3 align="left"><font color="#660066"> Version 1.1.9</font></h3>
Version 1.1.9</font></h3>
<ul> <ul>
<li>The shorewall "hits" command lists extraneous service names in the final <li>The shorewall "hits" command lists extraneous service names in
report. <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.9/shorewall"> the final report. <a
This version of the shorewall script</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.9/shorewall"> This
corrects this problem.<br> version of the shorewall script</a> corrects this problem.<br>
</li> </li>
</ul> </ul>
<h3 align="left">Version 1.1.8</h3>
<h3 align="Left">Version 1.1.8</h3>
<ul> <ul>
<li>Under some circumstances, the "dhcp" option on an interface triggers <li>Under some circumstances, the "dhcp" option on an interface triggers
a bug in the firewall script that results in a "chain already exists" a bug in the firewall script that results in a "chain already exists"
error. <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.8/firewall"> error. <a
This version of the firewall script</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.1.8/firewall"> This
corrects this problem. Install it into the location pointed to by version of the firewall script</a> corrects this problem. Install
the symbolic link /etc/shorewall/firewall.<br> it into the location pointed to by the symbolic link /etc/shorewall/firewall.<br>
<br> <br>
This problem is also corrected in version 1.1.9.<br> This problem is also corrected in version 1.1.9.<br>
</li> </li>
</ul> </ul>
<h3 align="left">Version 1.1.7</h3>
<h3 align="Left">Version 1.1.7</h3>
<ul> <ul>
<li>If the /etc/shorewall/rules template from version 1.1.7 is used, a warning <li>If the /etc/shorewall/rules template from version 1.1.7 is used,
message appears during firewall startup:<br> a warning message appears during firewall startup:<br>
<br> <br>
    Warning: Invalid Target - rule "@ icmp-unreachable packet."     Warning: Invalid Target - rule "@ icmp-unreachable packet."
ignored<br> ignored<br>
<br> <br>
This warning may be eliminated by replacing the "@" in column 1 of This warning may be eliminated by replacing the "@" in column 1 of
line 17 with "#"</li> line 17 with "#"</li>
</ul> </ul>
<blockquote> <blockquote>
<p align="Left"> <p align="left"> This problem is also corrected in version 1.1.8</p>
This problem is also corrected in version 1.1.8</p>
</blockquote> </blockquote>
<p align="left"><font size="2"> <p align="left"><font size="2"> Last updated 12/21/2001 - </font><font
Last updated 12/21/2001 - </font><font size="2"> size="2"> <a href="support.htm">Tom Eastep</a></font> </p>
<a href="support.htm">Tom Eastep</a></font>
</p>
<p align="left"><a href="copyright.htm">
<font size="2">Copyright</font> © <font size="2">2001, 2002 Thomas M. Eastep.</font></a></p>
<p align="left"><a href="copyright.htm"> <font size="2">Copyright</font>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></p>
<br>
</body> </body>
</html> </html>

544
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@ -2,152 +2,143 @@
<html> <html>
<head> <head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta http-equiv="Content-Type"
content="text/html; charset=windows-1252">
<title>Shorewall 1.2 Errata</title> <title>Shorewall 1.2 Errata</title>
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<body> <body>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" height="90" bgcolor="#400169">
<table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" height="90" bgcolor="#3366ff">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#FFFFFF">Shorewall 1.2 Errata</font></h1> <h1 align="center"><font color="#ffffff">Shorewall 1.2 Errata</font></h1>
</td> </td>
</tr> </tr>
</table>
<p align="center"> </tbody>
<font face="Century Gothic, Arial, Helvetica"> </table>
<p align="center"> <font face="Century Gothic, Arial, Helvetica">
<b><u>IMPORTANT</u></b></font></p> <b><u>IMPORTANT</u></b></font></p>
<p align="center"> <p align="center"> <b><u>If you use a Windows system to download a
corrected script, be sure to run the script through <a
<b><u>If you use a Windows system to download a corrected script, be sure to href="http://www.megaloman.com/%7Ehany/software/hd2u/"> dos2unix</a>
run the script through <a href="http://www.megaloman.com/%7Ehany/software/hd2u/">
dos2unix</a>
after you have moved it to your Linux system.</u></b></p> after you have moved it to your Linux system.</u></b></p>
<p align="center"> <p align="center"> <u><b>When the instructions say to install a corrected
firewall script in /etc/shorewall/firewall, use the 'cp' (or 'scp')
utility to overwrite the existing file. DO NOT REMOVE OR RENAME THE
OLD /etc/shorewall/firewall before you do that. /etc/shorewall/firewall
is a symbolic link that points to the 'shorewall' file used by your
system initialization scripts to start Shorewall during boot and it
is that file that must be overwritten with the corrected script. </b></u></p>
<u><b>When the instructions say to install a corrected firewall script in <ul>
/etc/shorewall/firewall, use the 'cp' (or 'scp') utility to overwrite the
existing file. DO NOT REMOVE OR RENAME THE OLD /etc/shorewall/firewall
before you do that. /etc/shorewall/firewall is a symbolic link that points
to the 'shorewall' file used by your system initialization scripts to
start Shorewall during boot and it is that file that must be overwritten
with the corrected script. </b></u></p>
<ul>
<li> <li>
<h3 align="left"><font color="#660066"> <a href="errata_1.htm"> Problems
<h3 align="Left"><font color="#660066"> in Version 1.1</a></font></h3>
<a href="errata_1.htm">
Problems in Version 1.1</a></font></h3>
</li> </li>
<li> <li>
<h3 align="left"><a href="#V1.2">Problems in Version 1.2</a></h3>
<h3 align="Left"><a href="#V1.2">Problems in Version 1.2</a></h3>
</li> </li>
<li> <li>
<h3 align="left"><font color="#660066"><a href="#iptables"> Problem
<h3 align="Left"><font color="#660066"><a href="#iptables"> with iptables version 1.2.3</a></font></h3>
Problem with iptables version 1.2.3</a></font></h3>
</li> </li>
<li> <li>
<h3 align="left"><a href="#Debug">Problems with kernel 2.4.18 and
<h3 align="Left"><a href="#Debug">Problems with kernel 2.4.18 and
RedHat iptables</a></h3> RedHat iptables</a></h3>
</li> </li>
</ul>
<hr>
<h3 align="Left"><a name="V1.2"></a>Problems in Version 1.2</h3> </ul>
<h3 align="Left">Version 1.2.13</h3> <hr>
<h3 align="left"><a name="V1.2"></a>Problems in Version 1.2</h3>
<ul> <h3 align="left">Version 1.2.13</h3>
<ul>
<li> <li>
<p align="left">Some users have reported problems installing the RPM
<p align="Left">Some users have reported problems installing the RPM
on SuSE 7.3 where rpm reports a conflict with kernel &lt;= 2.2 even on SuSE 7.3 where rpm reports a conflict with kernel &lt;= 2.2 even
though a 2.4 kernel RPM is installed. To get around this problem, use though a 2.4 kernel RPM is installed. To get around this problem,
the --nodeps option to rpm (e.g., &quot;rpm -ivh --nodeps use the --nodeps option to rpm (e.g., "rpm -ivh --nodeps
shorewall-1.2-13.noarch.rpm&quot;).<br> shorewall-1.2-13.noarch.rpm").<br>
<br> <br>
The problem stems from the fact that SuSE does not The problem stems from the fact that SuSE does not include
include a package named &quot;kernel&quot; but rather has a number of packages a package named "kernel" but rather has a number of packages that
that provide the virtual package &quot;kernel&quot;. Since virtual packages have provide the virtual package "kernel". Since virtual packages have
no version associated with them, a conflict results. Since the no version associated with them, a conflict results. Since the
workaround is simple, I don't intend to change the Shorewall package.</p> workaround is simple, I don't intend to change the Shorewall package.</p>
</li> </li>
<li> <li>
<p align="left">Shorewall accepts invalid rules of the form:<br>
<p align="Left">Shorewall accepts invalid rules of the form:<br>
<br> <br>
<font face="Courier">ACCEPT &lt;src&gt; &lt;dest&gt;:&lt;ip addr&gt; all &lt;port number&gt; - <font face="Courier">ACCEPT &lt;src&gt; &lt;dest&gt;:&lt;ip addr&gt;
&lt;original ip address&gt;<br> all &lt;port number&gt; - &lt;original ip address&gt;<br>
<br> <br>
</font>The &lt;port number&gt; is ignored with the result that <u>all</u> </font>The &lt;port number&gt; is ignored with the result that
connection requests from the &lt;src&gt; zone whose original destination IP <u>all</u> connection requests from the &lt;src&gt; zone whose
address matches the last column are forwarded to the &lt;dest&gt; zone, IP original destination IP address matches the last column are forwarded
address &lt;ip addr&gt;.&nbsp; to the &lt;dest&gt; zone, IP address &lt;ip addr&gt;. 
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.13/firewall"> <a
href="http://www.shorewall.net/pub/shorewall/errata/1.2.13/firewall">
This corrected firewall script</a> correctly generates an error when This corrected firewall script</a> correctly generates an error when
such a rule is encountered.</p> such a rule is encountered.</p>
</li> </li>
</ul>
<h3 align="Left">Version 1.2.11</h3> </ul>
<ul> <h3 align="left">Version 1.2.11</h3>
<ul>
<li> <li>
<p align="left">The 'try' command is broken. </p>
<p align="Left">The 'try' command is broken.</li> </li>
<li> <li>
<p align="left">The usage text printed by the shorewall utility
doesn't show the optional timeout for the 'try' command. </p>
</li>
</ul>
<p align="Left">The usage text printed by the shorewall utility <p align="left">Both problems are corrected by <a
doesn't show the optional timeout for the 'try' command.</li> href="http://www.shorewall.net/pub/shorewall/errata/1.2.11/shorewall">
</ul>
<p align="Left">Both problems are corrected by
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.11/shorewall">
this new version of /sbin/shorewall</a>.</p> this new version of /sbin/shorewall</a>.</p>
<h3 align="Left">Sample Configurations:</h3> <h3 align="left">Sample Configurations:</h3>
<ul> <ul>
<li> <li>
<p align="left">There have been several problems with SSH, DNS and
<p align="Left">There have been several problems with SSH, DNS and
ping in the two- and three-interface examples. Before reporting ping in the two- and three-interface examples. Before reporting
problems with these services, please verify that you have the latest problems with these services, please verify that you have the latest
version of the appropriate sample 'rules' file.</li> version of the appropriate sample 'rules' file. </p>
</ul> </li>
</ul>
<h3 align="Left">All Versions through 1.2.10</h3> <h3 align="left">All Versions through 1.2.10</h3>
<ul> <ul>
<li> <li>
<p align="left">The <a href="PPTP.htm#ServerFW">documentation for
<p align="Left">The <a href="PPTP.htm#ServerFW">documentation for
running PoPToP on the firewall system</a> contained an incorrect entry running PoPToP on the firewall system</a> contained an incorrect entry
in the /etc/shorewall/hosts file. The corrected entry (underlined) is in the /etc/shorewall/hosts file. The corrected entry (underlined)
shown here:</li> is shown here: </p>
</ul> </li>
<blockquote> </ul>
<blockquote>
<blockquote> <blockquote>
<table border="2"> <table border="2">
<tbody>
<tr> <tr>
<td><b>ZONE</b></td> <td><b>ZONE</b></td>
<td><b>HOST(S)</b></td> <td><b>HOST(S)</b></td>
@ -161,279 +152,274 @@ dos2unix</a>
<tr> <tr>
<td>loc</td> <td>loc</td>
<td>ppp+:192.168.1.0/24</td> <td>ppp+:192.168.1.0/24</td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
</tbody>
</table> </table>
</blockquote> </blockquote>
</blockquote> </blockquote>
<h3 align="Left">All Versions through 1.2.8</h3> <h3 align="left">All Versions through 1.2.8</h3>
<ul> <ul>
<li> <li>
<p align="left">The shorewall.conf file and the documentation
<p align="Left">The shorewall.conf file and the documentation
incorrectly refer to a parameter in /etc/shorewall/shorewall.conf incorrectly refer to a parameter in /etc/shorewall/shorewall.conf
called LOCKFILE; the correct name for the parameter is SUBSYSLOCK (<a href="Documentation.htm#Conf">see called LOCKFILE; the correct name for the parameter is SUBSYSLOCK (<a
the corrected online documentation</a>). Users of the rpm should href="Documentation.htm#Conf">see the corrected online documentation</a>).
change the name (and possibly the value) of this parameter so that Users of the rpm should change the name (and possibly the value)
Shorewall interacts properly with the SysV init scripts. The of this parameter so that Shorewall interacts properly with the
documentation on this web site has been corrected and SysV init scripts. The documentation on this web site has been
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.8/shorewall.conf"> corrected and <a
href="http://www.shorewall.net/pub/shorewall/errata/1.2.8/shorewall.conf">
here's a corrected version of shorewall.conf</a>.</p> here's a corrected version of shorewall.conf</a>.</p>
</li> </li>
<li> <li>
<p align="left">The documentation indicates that a comma-separated
<p align="Left">The documentation indicates that a comma-separated
list of IP/subnet addresses may appear in an entry in the hosts file. list of IP/subnet addresses may appear in an entry in the hosts file.
This is not the case; if you want to specify multiple addresses for a This is not the case; if you want to specify multiple addresses
zone, you need to have a separate entry for each address.</p> for a zone, you need to have a separate entry for each address.</p>
</li> </li>
</ul>
<h3 align="Left">Version 1.2.7</h3> </ul>
<p align="Left">Version 1.2.7 is quite broken -- please install 1.2.8</p> <h3 align="left">Version 1.2.7</h3>
<p>If you have installed and started version 1.2.7 then before trying <p align="left">Version 1.2.7 is quite broken -- please install 1.2.8</p>
<p>If you have installed and started version 1.2.7 then before trying
to restart under 1.2.8:</p> to restart under 1.2.8:</p>
<ol>
<ol>
<li>Look at your /etc/shorewall/shorewall.conf file and note the directory <li>Look at your /etc/shorewall/shorewall.conf file and note the directory
named in the STATEDIR variable. If that variable is empty, assume named in the STATEDIR variable. If that variable is empty, assume /var/state/shorewall.</li>
/var/state/shorewall.</li>
<li>Remove the file 'lock' in the directory determined in step 1.</li> <li>Remove the file 'lock' in the directory determined in step 1.</li>
</ol>
<p>You may now restart using 1.2.8.</p>
<h3 align="Left">Version 1.2.6</h3> </ol>
<ul> <p>You may now restart using 1.2.8.</p>
<h3 align="left">Version 1.2.6</h3>
<ul>
<li> <li>
<p align="left">GRE and IPIP tunnels are broken. </p>
<p align="Left">GRE and IPIP tunnels are broken.</li> </li>
<li> <li>
<p align="left">The following rule results in a start error:<br>
<p align="Left">The following rule results in a start error:<br>
<br> <br>
&nbsp;&nbsp;&nbsp; ACCEPT&nbsp;&nbsp;&nbsp; z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;     ACCEPT    z1    z2    icmp </p>
icmp</li> </li>
</ul> </ul>
<p align="Left">To correct the above problems, install <p align="left">To correct the above problems, install <a
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.6/firewall">this href="http://www.shorewall.net/pub/shorewall/errata/1.2.6/firewall">this
corrected firewall script</a> in&nbsp; /etc/shorewall/firewall..<h3 align="Left">Version 1.2.5</h3> corrected firewall script</a> in  /etc/shorewall/firewall..</p>
<h3 align="left">Version 1.2.5</h3>
<ul> <ul>
<li> <li>
<p align="left">The new ADDRESS column in /etc/shorewall/masq cannot
<p align="Left">The new ADDRESS column in /etc/shorewall/masq cannot contain a $-variable name. </p>
contain a $-variable name.</li> </li>
<li> <li>
<p align="left">Errors result if $FW appears in the /etc/shorewall/policy
<p align="Left">Errors result if $FW appears in the file. </p>
/etc/shorewall/policy file.</li> </li>
<li> <li>
<p align="left">Using Blacklisting without setting BLACKLIST_LOGLEVEL
results in an error at start time. </p>
</li>
</ul>
<p align="Left">Using Blacklisting without setting BLACKLIST_LOGLEVEL <p align="left">To correct the above problems, install <a
results in an error at start time.</li> href="http://www.shorewall.net/pub/shorewall/errata/1.2.5/firewall">this
</ul> corrected firewall script</a> in /etc/shorewall/firewall.</p>
<p align="left"> </p>
<p align="Left">To correct the above problems, install <ul>
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.5/firewall">this
corrected firewall script</a> in /etc/shorewall/firewall.<p align="Left">&nbsp;<ul>
<li> <li>
<p align="left">The /sbin/shorewall script produces error messages
saying that 'mygrep' cannot be found. <a
href="http://www.shorewall.net/pub/shorewall/errata/1.2.5/shorewall">
Here is the correct version of /sbin/shorewall.</a> </p>
</li>
</ul>
<p align="Left">The /sbin/shorewall script produces error messages <h3 align="left">Version 1.2.4</h3>
saying that 'mygrep' cannot be found.
<a href="http://www.shorewall.net/pub/shorewall/errata/1.2.5/shorewall">
Here is the correct version of /sbin/shorewall.</a></li>
</ul>
<h3 align="Left">Version 1.2.4</h3> <ul>
<ul>
<li><p align="Left">This version will not install &quot;out of the box&quot; without
modification. Before attempting to start the
firewall, please change the STATEDIR in /etc/shorewall/shorewall.conf to
refer to /var/lib/shorewall. This only applies to fresh installations -- if
you are upgrading from a previous version of Shorewall, version 1.2.4 will
work without modification.</li>
</ul>
<h3 align="Left">Version 1.2.3</h3>
<ul>
<li> <li>
<p align="Left">When BLACKLIST_LOGLEVEL is set, packets from blacklisted <p align="left">This version will not install "out of the box" without
hosts aren't logged. Install <a href="http://www.shorewall.net/pub/shorewall/errata/1.2.3/firewall">this modification. Before attempting to start the firewall, please change
corrected firewall script</a> in /etc/shorewall/firewall.</li> the STATEDIR in /etc/shorewall/shorewall.conf to refer to /var/lib/shorewall.
</ul> This only applies to fresh installations -- if you are upgrading from
<blockquote> a previous version of Shorewall, version 1.2.4 will work without modification.
</p>
</li>
</ul>
<h3 align="left">Version 1.2.3</h3>
<ul>
<li>
<p align="left">When BLACKLIST_LOGLEVEL is set, packets from blacklisted
hosts aren't logged. Install <a
href="http://www.shorewall.net/pub/shorewall/errata/1.2.3/firewall">this
corrected firewall script</a> in /etc/shorewall/firewall. </p>
</li>
</ul>
<blockquote>
<p>Alternatively, edit /etc/shorewall/firewall and change line 1564 from:</p> <p>Alternatively, edit /etc/shorewall/firewall and change line 1564 from:</p>
</blockquote> </blockquote>
<pre> run_iptables -A blacklst -d $addr -j LOG $LOGPARAMS --log-prefix \</pre>
<blockquote>
<pre> run_iptables -A blacklst -d $addr -j LOG $LOGPARAMS --log-prefix \</pre>
<blockquote>
<p>to</p> <p>to</p>
</blockquote> </blockquote>
<pre> run_iptables -A blacklst -s $addr -j LOG $LOGPARAMS --log-prefix \</pre>
<h3 align="Left">Version 1.2.2</h3> <pre> run_iptables -A blacklst -s $addr -j LOG $LOGPARAMS --log-prefix \</pre>
<ul> <h3 align="left">Version 1.2.2</h3>
<li>The &quot;shorewall status&quot; command hangs after
it displays the chain information. <a href="pub/shorewall/errata/1.2.2/shorewall">Here's
a corrected /sbin/shorewall.</a> if&nbsp; you want to simply modify your copy of
/sbin/shorewall, then at line 445 change this:</li>
</ul>
<div align="left"> <ul>
<li>The "shorewall status" command hangs after it displays
the chain information. <a href="pub/shorewall/errata/1.2.2/shorewall">Here's
a corrected /sbin/shorewall.</a> if  you want to simply modify
your copy of /sbin/shorewall, then at line 445 change this:</li>
<pre align="Left"> status) </ul>
clear</pre>
<div align="left">
<pre align="Left"> status)<br> clear</pre>
</div> </div>
<blockquote>
<p align="Left">to this:</p>
<blockquote>
<p align="left">to this:</p>
</blockquote> </blockquote>
<div align="left">
<pre align="Left"> status)
get_config
clear</pre>
<div align="left">
<pre align="Left"> status)<br> get_config<br> clear</pre>
</div> </div>
<ul>
<li>The &quot;shorewall monitor&quot; command <ul>
doesn't show the icmpdef chain - <a href="pub/shorewall/errata/1.2.2/shorewall">this <li>The "shorewall monitor" command doesn't show the icmpdef chain
corrected /sbin/shorewall</a> fixes that problem as well as the status - <a href="pub/shorewall/errata/1.2.2/shorewall">this corrected /sbin/shorewall</a>
problem described above.</li> fixes that problem as well as the status problem described above.</li>
</ul>
<ul> </ul>
<li>In all 1.2.x versions, the 'CLIENT PORT(S)'
column in /etc/shorewall/tcrules is ignored. This is corrected in <a href="/pub/shorewall/errata/1.2.2/firewall">this <ul>
updated firewall script</a>.&nbsp; Place the script in /etc/shorewall/firewall. Thanks to Shingo Takeda for <li>In all 1.2.x versions, the 'CLIENT PORT(S)' column in /etc/shorewall/tcrules
is ignored. This is corrected in <a
href="/pub/shorewall/errata/1.2.2/firewall">this updated firewall script</a>. 
Place the script in /etc/shorewall/firewall. Thanks to Shingo Takeda for
spotting this bug.</li> spotting this bug.</li>
</ul>
<h3 align="Left">Version 1.2.1</h3> </ul>
<ul> <h3 align="left">Version 1.2.1</h3>
<li>The new <i>logunclean </i>interface option is not
described in the help text in /etc/shorewall/interfaces. An <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.2.1/interfaces">updated <ul>
<li>The new <i>logunclean </i>interface option is not described
in the help text in /etc/shorewall/interfaces. An <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.2.1/interfaces">updated
interfaces file</a> is available.</li> interfaces file</a> is available.</li>
<li>When REJECT is specified in a TCP rule, Shorewall <li>When REJECT is specified in a TCP rule, Shorewall correctly
correctly replies with a TCP RST packet. Previous versions of the replies with a TCP RST packet. Previous versions of the firewall
firewall script are broken in the case of a REJECT policy, however; in script are broken in the case of a REJECT policy, however; in REJECT
REJECT policy chains, all requests are currently replied to with an policy chains, all requests are currently replied to with an ICMP
ICMP port-unreachable packet. <a href="http://www.shorewall.net/pub/shorewall/errata/1.2.1/firewall">This port-unreachable packet. <a
corrected firewall script</a> replies to TCP requests with TCP RST in href="http://www.shorewall.net/pub/shorewall/errata/1.2.1/firewall">This
REJECT policy chains. Place the script in /etc/shorewall/firewall.</li> corrected firewall script</a> replies to TCP requests with TCP
</ul> RST in REJECT policy chains. Place the script in /etc/shorewall/firewall.</li>
<h3 align="Left">Version 1.2.0</h3> </ul>
<blockquote> <h3 align="left">Version 1.2.0</h3>
<p align="Left"><b>Note: </b>If you are upgrading from one of the Beta <blockquote>
RPMs to 1.2.0, you must use the &quot;--oldpackage&quot; option to rpm <p align="left"><b>Note: </b>If you are upgrading from one of the Beta
RPMs to 1.2.0, you must use the "--oldpackage" option to rpm
(e.g., rpm -Uvh --oldpackage shorewall-1.2-0.noarch.rpm).</p> (e.g., rpm -Uvh --oldpackage shorewall-1.2-0.noarch.rpm).</p>
<p align="Left">The tunnel script released in version 1.2.0 contained <p align="left">The tunnel script released in version 1.2.0 contained
errors -- a <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.2.0/tunnel">corrected errors -- a <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/1.2.0/tunnel">corrected
script</a> is available.</p> script</a> is available.</p>
</blockquote> </blockquote>
<hr> <hr>
<h3 align="left"><a name="iptables"></a><font color="#660066"> Problem with
iptables version 1.2.3</font></h3>
<h3 align="Left"><a name="iptables"></a><font color="#660066"> <blockquote>
Problem with iptables version 1.2.3</font></h3> <p align="left">There are a couple of serious bugs in iptables 1.2.3 that
prevent it from working with Shorewall. Regrettably, RedHat released
this buggy iptables in RedHat 7.2. </p>
<blockquote> <p align="left"> I have built a <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3-3.i386.rpm">
corrected 1.2.3 rpm which you can download here</a>  and I have also built
an <a
href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm">
iptables-1.2.4 rpm which you can download here</a>. If you are currently
running RedHat 7.1, you can install either of these RPMs <b><u>before</u>
</b>you upgrade to RedHat 7.2.</p>
<p align="Left">There are a couple of serious bugs in iptables 1.2.3 that <p align="left"><font face="Century Gothic, Arial, Helvetica"
prevent it from working with Shorewall. Regrettably, color="#ff6633"><b>Update 11/9/2001: </b></font>RedHat has released
RedHat released this buggy iptables in RedHat 7.2.&nbsp;</p> an iptables-1.2.4 RPM of their own which you can download from<font
face="Century Gothic, Arial, Helvetica" color="#ff6633"> <a
href="http://www.redhat.com/support/errata/RHSA-2001-144.html">http://www.redhat.com/support/errata/RHSA-2001-144.html</a>.
</font>I have installed this RPM on my firewall and it works fine.</p>
<p align="Left"> I have built a <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3-3.i386.rpm"> <p align="left">If you would like to patch iptables 1.2.3 yourself,
corrected 1.2.3 rpm which you can download here</a>&nbsp; and I have also built the patches are available for download. This <a
an <a href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm"> href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/loglevel.patch">patch</a>
iptables-1.2.4 rpm which you can download here</a>. If which corrects a problem with parsing of the --log-level specification
you are currently running RedHat 7.1, you can install either of these RPMs while this <a
<b><u>before</u> </b>you upgrade to RedHat 7.2.</p> href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/tos.patch">patch</a>
corrects a problem in handling the  TOS target.</p>
<p align="Left"><font face="Century Gothic, Arial, Helvetica" color="#FF6633"><b>Update <p align="left">To install one of the above patches:</p>
11/9/2001: </b></font>RedHat has
released an iptables-1.2.4 RPM of their own which you can download from<font face="Century Gothic, Arial, Helvetica" color="#FF6633">
<a href="http://www.redhat.com/support/errata/RHSA-2001-144.html">http://www.redhat.com/support/errata/RHSA-2001-144.html</a>.
</font>I have installed this RPM
on my firewall and it works fine.</p>
<p align="Left">If you
would like to patch iptables 1.2.3 yourself, the patches are available
for download. This <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/loglevel.patch">patch</a>
which corrects a problem with parsing of the --log-level specification while
this <a href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/tos.patch">patch</a>
corrects a problem in handling the&nbsp; TOS target.</p>
<p align="Left">To install one of the above patches:</p>
<ul> <ul>
<li>cd iptables-1.2.3/extensions</li> <li>cd iptables-1.2.3/extensions</li>
<li>patch -p0 &lt; <i>the-patch-file</i></li> <li>patch -p0 &lt; <i>the-patch-file</i></li>
</ul> </ul>
</blockquote> </blockquote>
<h3><a name="Debug"></a>Problems with kernel 2.4.18 <h3><a name="Debug"></a>Problems with kernel 2.4.18
and RedHat iptables</h3> and RedHat iptables</h3>
<blockquote>
<p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18
may experience the following:</p>
<blockquote> <blockquote>
<p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18 may <pre># shorewall start<br>Processing /etc/shorewall/shorewall.conf ...<br>Processing /etc/shorewall/params ...<br>Starting Shorewall...<br>Loading Modules...<br>Initializing...<br>Determining Zones...<br>Zones: net<br>Validating interfaces file...<br>Validating hosts file...<br>Determining Hosts in Zones...<br>Net Zone: eth0:0.0.0.0/0<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br></pre>
experience the following:</p>
<blockquote>
<pre># shorewall start
Processing /etc/shorewall/shorewall.conf ...
Processing /etc/shorewall/params ...
Starting Shorewall...
Loading Modules...
Initializing...
Determining Zones...
Zones: net
Validating interfaces file...
Validating hosts file...
Determining Hosts in Zones...
Net Zone: eth0:0.0.0.0/0
iptables: libiptc/libip4tc.c:380: do_check: Assertion
`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.
Aborted (core dumped)
iptables: libiptc/libip4tc.c:380: do_check: Assertion
`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.
Aborted (core dumped)
</pre>
</blockquote> </blockquote>
<p>The RedHat iptables RPM is compiled with debugging enabled but the <p>The RedHat iptables RPM is compiled with debugging enabled but the
user-space debugging code was not updated to reflect recent changes in the user-space debugging code was not updated to reflect recent changes in
Netfilter 'mangle' table. You can correct the problem by installing the Netfilter 'mangle' table. You can correct the problem by installing
<a href="http://www.shorewall.net/pub/shorewall/iptables-1.2.5-1.i386.rpm"> <a
href="http://www.shorewall.net/pub/shorewall/iptables-1.2.5-1.i386.rpm">
this iptables RPM</a>. If you are already running a 1.2.5 version of this iptables RPM</a>. If you are already running a 1.2.5 version of
iptables, you will need to specify the --oldpackage option to rpm (e.g., iptables, you will need to specify the --oldpackage option to rpm (e.g.,
&quot;iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm&quot;).</p> "iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm").</p>
</blockquote> </blockquote>
<p><font face="Century Gothic, Arial, Helvetica"><font size="2"> <p><font face="Century Gothic, Arial, Helvetica"><font size="2"> Last updated
Last updated 5/24/2002 - </font><font size="2"> 5/24/2002 - </font><font size="2"> <a
<a href="support.htm">Tom Eastep</a></font> href="support.htm">Tom Eastep</a></font> </font></p>
</font></p>
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p> © <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font></p>
<br>
</body> </body>
</html> </html>

227
Shorewall-docs/errata_3.html
View File

@ -2,36 +2,28 @@
<html> <html>
<head> <head>
<meta http-equiv="Content-Type" <meta http-equiv="Content-Type"
content="text/html; charset=windows-1252"> content="text/html; charset=windows-1252">
<title>Shorewall 1.3 Errata</title> <title>Shorewall 1.3 Errata</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="ProgId" content="FrontPage.Editor.Document">
<meta name="Microsoft Theme" content="none"> <meta name="Microsoft Theme" content="none">
</head> </head>
<body> <body>
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Shorewall Errata/Upgrade Issues</font></h1> <h1 align="center"><font color="#ffffff">Shorewall Errata/Upgrade Issues</font></h1>
</td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
@ -39,8 +31,6 @@
<ol> <ol>
<li> <li>
<p align="left"> <b><u>I</u>f you use a Windows system to download <p align="left"> <b><u>I</u>f you use a Windows system to download
a corrected script, be sure to run the script through <u> a corrected script, be sure to run the script through <u>
<a href="http://www.megaloman.com/%7Ehany/software/hd2u/" <a href="http://www.megaloman.com/%7Ehany/software/hd2u/"
@ -48,31 +38,26 @@
it to your Linux system.</b></p> it to your Linux system.</b></p>
</li> </li>
<li> <li>
<p align="left"> <b>If you are installing Shorewall for the first
time and plan to use the .tgz and install.sh script, you can untar
<p align="left"> <b>If you are installing Shorewall for the the archive, replace the 'firewall' script in the untarred directory
first time and plan to use the .tgz and install.sh script, you can
untar the archive, replace the 'firewall' script in the untarred directory
with the one you downloaded below, and then run install.sh.</b></p> with the one you downloaded below, and then run install.sh.</b></p>
</li> </li>
<li> <li>
<p align="left"> <b>If you are running a Shorewall version earlier <p align="left"> <b>If you are running a Shorewall version earlier
than 1.3.11, when the instructions say to install a corrected than 1.3.11, when the instructions say to install a corrected firewall
firewall script in /etc/shorewall/firewall, /usr/lib/shorewall/firewall script in /etc/shorewall/firewall, /usr/lib/shorewall/firewall
or /var/lib/shorewall/firewall, use the 'cp' (or 'scp') utility to or /var/lib/shorewall/firewall, use the 'cp' (or 'scp') utility to
overwrite the existing file. DO NOT REMOVE OR RENAME THE OLD overwrite the existing file. DO NOT REMOVE OR RENAME THE OLD
/etc/shorewall/firewall or /var/lib/shorewall/firewall before /etc/shorewall/firewall or /var/lib/shorewall/firewall before
you do that. /etc/shorewall/firewall and /var/lib/shorewall/firewall you do that. /etc/shorewall/firewall and /var/lib/shorewall/firewall
are symbolic links that point to the 'shorewall' file used by are symbolic links that point to the 'shorewall' file used by your
your system initialization scripts to start Shorewall during system initialization scripts to start Shorewall during boot.
boot. It is that file that must be overwritten with the corrected It is that file that must be overwritten with the corrected
script. Beginning with Shorewall 1.3.11, you may rename the existing file script. Beginning with Shorewall 1.3.11, you may rename the existing file
before copying in the new file.</b></p> before copying in the new file.</b></p>
</li> </li>
<li> <li>
<p align="left"><b><font color="#ff0000">DO NOT INSTALL CORRECTED COMPONENTS <p align="left"><b><font color="#ff0000">DO NOT INSTALL CORRECTED COMPONENTS
ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER BELOW. ON A RELEASE EARLIER THAN THE ONE THAT THEY ARE LISTED UNDER BELOW.
For example, do NOT install the 1.3.9a firewall script if you are running For example, do NOT install the 1.3.9a firewall script if you are running
@ -94,8 +79,7 @@ before copying in the new file.</b></p>
color="#660066"><a href="#iptables"> Problem with iptables version 1.2.3 color="#660066"><a href="#iptables"> Problem with iptables version 1.2.3
on RH7.2</a></font></b></li> on RH7.2</a></font></b></li>
<li> <b><a <li> <b><a
href="#Debug">Problems with kernels &gt;= 2.4.18 and href="#Debug">Problems with kernels &gt;= 2.4.18 and RedHat iptables</a></b></li>
RedHat iptables</a></b></li>
<li><b><a href="#SuSE">Problems installing/upgrading <li><b><a href="#SuSE">Problems installing/upgrading
RPM on SuSE</a></b></li> RPM on SuSE</a></b></li>
<li><b><a href="#Multiport">Problems with iptables <li><b><a href="#Multiport">Problems with iptables
@ -109,7 +93,6 @@ RedHat iptables</a></b></li>
<hr> <hr>
<h2 align="left"><small></small><a name="V1.3"></a>Problems in Version 1.3</h2> <h2 align="left"><small></small><a name="V1.3"></a>Problems in Version 1.3</h2>
<h3>Version 1.3.14</h3> <h3>Version 1.3.14</h3>
<ul> <ul>
@ -122,9 +105,10 @@ RedHat iptables</a></b></li>
<ul> <ul>
<li>The documentation for the routestopped file claimed that a comma-separated <li>The documentation for the routestopped file claimed that a comma-separated
list could appear in the second column while the code only supported a single list could appear in the second column while the code only supported a
host or network address.</li> single host or network address.</li>
<li>Log messages produced by 'logunclean' and 'dropunclean' were not rate-limited.</li> <li>Log messages produced by 'logunclean' and 'dropunclean' were not
rate-limited.</li>
<li>802.11b devices with names of the form <i>wlan</i>&lt;n&gt; don't <li>802.11b devices with names of the form <i>wlan</i>&lt;n&gt; don't
support the 'maclist' interface option.</li> support the 'maclist' interface option.</li>
<li>Log messages generated by RFC 1918 filtering are not rate limited.</li> <li>Log messages generated by RFC 1918 filtering are not rate limited.</li>
@ -144,8 +128,8 @@ in /etc/shorewall/masq and the default route is through eth1.<br>
<li>The 'shorewall add' command produces an error message referring <li>The 'shorewall add' command produces an error message referring
to 'find_interfaces_by_maclist'.</li> to 'find_interfaces_by_maclist'.</li>
<li>The 'shorewall delete' command can leave behind undeleted rules.</li> <li>The 'shorewall delete' command can leave behind undeleted rules.</li>
<li>The 'shorewall add' command can fail with "iptables: Index of insertion <li>The 'shorewall add' command can fail with "iptables: Index of
too big".<br> insertion too big".<br>
</li> </li>
</ul> </ul>
@ -182,8 +166,8 @@ support, post on the users list and I can provide you with a patched version.<
<ul> <ul>
<li>The .lrp was missing the /etc/shorewall/routestopped file <li>The .lrp was missing the /etc/shorewall/routestopped file
-- a new lrp (shorwall-1.3.12a.lrp) has been released which corrects -- a new lrp (shorwall-1.3.12a.lrp) has been released which corrects this
this problem.<br> problem.<br>
</li> </li>
</ul> </ul>
@ -234,11 +218,11 @@ a fix.<br>
<a <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.10/firewall">this href="http://www.shorewall.net/pub/shorewall/errata/1.3.10/firewall">this
version of the firewall script</a> may help. Please report any cases version of the firewall script</a> may help. Please report any cases
where installing this script in /usr/lib/shorewall/firewall solved where installing this script in /usr/lib/shorewall/firewall solved your
your connection problems. Beginning with version 1.3.10, it is safe connection problems. Beginning with version 1.3.10, it is safe to save
to save the old version of /usr/lib/shorewall/firewall before copying the old version of /usr/lib/shorewall/firewall before copying in the
in the new one since /usr/lib/shorewall/firewall is the real script new one since /usr/lib/shorewall/firewall is the real script now and
now and not just a symbolic link to the real script.<br> not just a symbolic link to the real script.<br>
</li> </li>
</ul> </ul>
@ -301,73 +285,58 @@ loc dmz:10.1.1.1:24 tcp 25 - 10.1.1.1")<br>
problems. problems.
<h3>Version 1.3.7b</h3> <h3>Version 1.3.7b</h3>
<p>DNAT rules where the source zone is 'fw' ($FW) result in an error
<p>DNAT rules where the source zone is 'fw' ($FW) message. Installing <a
result in an error message. Installing
<a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall">
this corrected firewall script</a> in /var/lib/shorewall/firewall this corrected firewall script</a> in /var/lib/shorewall/firewall
as described above corrects this as described above corrects this
problem.</p> problem.</p>
<h3>Version 1.3.7a</h3> <h3>Version 1.3.7a</h3>
<p>"shorewall refresh" is not creating the proper rule for FORWARDPING=Yes.
<p>"shorewall refresh" is not creating the proper Consequently, after "shorewall refresh", the firewall will not
rule for FORWARDPING=Yes. Consequently, after forward icmp echo-request (ping) packets. Installing
"shorewall refresh", the firewall will not forward
icmp echo-request (ping) packets. Installing
<a <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall">
this corrected firewall script</a> in /var/lib/shorewall/firewall this corrected firewall script</a> in /var/lib/shorewall/firewall
as described above corrects this as described above corrects this
problem.</p> problem.</p>
<h3>Version &lt;= 1.3.7a</h3> <h3>Version &lt;= 1.3.7a</h3>
<p>If "norfc1918" and "dhcp" are both specified as options on a
<p>If "norfc1918" and "dhcp" are both specified as given interface then RFC 1918 checking is occurring before DHCP
options on a given interface then RFC 1918 checking. This means that if a DHCP client broadcasts using
checking is occurring before DHCP checking. This an RFC 1918 source address, then the firewall will
means that if a DHCP client broadcasts using an
RFC 1918 source address, then the firewall will
reject the broadcast (usually logging it). This reject the broadcast (usually logging it). This
has two problems:</p> has two problems:</p>
<ol> <ol>
<li>If the firewall <li>If the firewall
is running a DHCP server, the is running a DHCP server, the client
client won't be able to obtain an IP address won't be able to obtain an IP address lease from
lease from that server.</li> that server.</li>
<li>With this order <li>With this order
of checking, the "dhcp" option of checking, the "dhcp" option
cannot be used as a noise-reduction cannot be used as a noise-reduction measure where there are both
measure where there are both dynamic and static dynamic and static clients on a LAN segment.</li>
clients on a LAN segment.</li>
</ol> </ol>
<p> <a <p> <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.7/firewall">
This version of the 1.3.7a firewall script </a> This version of the 1.3.7a firewall script </a>
corrects the problem. It must be corrects the problem. It must be installed
installed in /var/lib/shorewall as in /var/lib/shorewall as described
described above.</p> above.</p>
<h3>Version 1.3.7</h3> <h3>Version 1.3.7</h3>
<p>Version 1.3.7 dead on arrival -- please use version 1.3.7a and check
<p>Version 1.3.7 dead on arrival -- please use your version against these md5sums -- if there's a difference, please
version 1.3.7a and check your version against
these md5sums -- if there's a difference, please
download again.</p> download again.</p>
<pre> d2fffb7fb99bcc6cb047ea34db1df10 shorewall-1.3.7a.tgz<br> 6a7fd284c8685b2b471a2f47b469fb94 shorewall-1.3.7a-1.noarch.rpm<br> 3decd14296effcff16853106771f7035 shorwall-1.3.7a.lrp</pre> <pre> d2fffb7fb99bcc6cb047ea34db1df10 shorewall-1.3.7a.tgz<br> 6a7fd284c8685b2b471a2f47b469fb94 shorewall-1.3.7a-1.noarch.rpm<br> 3decd14296effcff16853106771f7035 shorwall-1.3.7a.lrp</pre>
<p>In other words, type "md5sum &lt;<i>whatever package you downloaded</i>&gt; <p>In other words, type "md5sum &lt;<i>whatever package you downloaded</i>&gt;
@ -380,15 +349,11 @@ described above.</p>
<ul> <ul>
<li> <li>
<p align="left">If ADD_SNAT_ALIASES=Yes is specified in /etc/shorewall/shorewall.conf, <p align="left">If ADD_SNAT_ALIASES=Yes is specified in /etc/shorewall/shorewall.conf,
an error occurs when the firewall script attempts to an error occurs when the firewall script attempts to
add an SNAT alias. </p> add an SNAT alias. </p>
</li> </li>
<li> <li>
<p align="left">The <b>logunclean </b>and <b>dropunclean</b> options <p align="left">The <b>logunclean </b>and <b>dropunclean</b> options
cause errors during startup when Shorewall is run with iptables cause errors during startup when Shorewall is run with iptables
1.2.7. </p> 1.2.7. </p>
@ -398,9 +363,8 @@ described above.</p>
<p align="left">These problems are fixed in <a <p align="left">These problems are fixed in <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.6/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.6/firewall">
this correct firewall script</a> which must be installed in this correct firewall script</a> which must be installed in /var/lib/shorewall/
/var/lib/shorewall/ as described above. These problems are also as described above. These problems are also corrected in version 1.3.7.</p>
corrected in version 1.3.7.</p>
<h3 align="left">Two-interface Samples 1.3.6 (file two-interfaces.tgz)</h3> <h3 align="left">Two-interface Samples 1.3.6 (file two-interfaces.tgz)</h3>
@ -419,7 +383,7 @@ described above.</p>
This is fixed in <a This is fixed in <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.5/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.5/firewall">
this corrected firewall script</a> which must be installed in this corrected firewall script</a> which must be installed in
/var/lib/shorewall/ as described above.</p> /var/lib/shorewall/ as described above.</p>
<h3 align="left">Versions 1.3.4-1.3.5a</h3> <h3 align="left">Versions 1.3.4-1.3.5a</h3>
@ -445,8 +409,7 @@ described above.</p>
<h3 align="left">Version 1.3.5</h3> <h3 align="left">Version 1.3.5</h3>
<p align="left">REDIRECT rules are broken in this version. Install <p align="left">REDIRECT rules are broken in this version. Install <a
<a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.5/firewall"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.5/firewall">
this corrected firewall script</a> in /var/lib/pub/shorewall/firewall this corrected firewall script</a> in /var/lib/pub/shorewall/firewall
as instructed above. This problem is corrected in version as instructed above. This problem is corrected in version
@ -455,29 +418,29 @@ described above.</p>
<h3 align="left">Version 1.3.n, n &lt; 4</h3> <h3 align="left">Version 1.3.n, n &lt; 4</h3>
<p align="left">The "shorewall start" and "shorewall restart" commands <p align="left">The "shorewall start" and "shorewall restart" commands
to not verify that the zones named in the /etc/shorewall/policy to not verify that the zones named in the /etc/shorewall/policy file
file have been previously defined in the /etc/shorewall/zones have been previously defined in the /etc/shorewall/zones file.
file. The "shorewall check" command does perform this verification The "shorewall check" command does perform this verification so
so it's a good idea to run that command after you have made configuration it's a good idea to run that command after you have made configuration
changes.</p> changes.</p>
<h3 align="left">Version 1.3.n, n &lt; 3</h3> <h3 align="left">Version 1.3.n, n &lt; 3</h3>
<p align="left">If you have upgraded from Shorewall 1.2 and after <p align="left">If you have upgraded from Shorewall 1.2 and after "Activating
"Activating rules..." you see the message: "iptables: No chains/target/match rules..." you see the message: "iptables: No chains/target/match
by that name" then you probably have an entry in /etc/shorewall/hosts by that name" then you probably have an entry in /etc/shorewall/hosts
that specifies an interface that you didn't include that specifies an interface that you didn't include
in /etc/shorewall/interfaces. To correct this problem, you in /etc/shorewall/interfaces. To correct this problem, you
must add an entry to /etc/shorewall/interfaces. Shorewall 1.3.3 must add an entry to /etc/shorewall/interfaces. Shorewall 1.3.3
and later versions produce a clearer error message in and later versions produce a clearer error message in this
this case.</p> case.</p>
<h3 align="left">Version 1.3.2</h3> <h3 align="left">Version 1.3.2</h3>
<p align="left">Until approximately 2130 GMT on 17 June 2002, the <p align="left">Until approximately 2130 GMT on 17 June 2002, the download
download sites contained an incorrect version of the .lrp file. That sites contained an incorrect version of the .lrp file. That file
file can be identified by its size (56284 bytes). The correct can be identified by its size (56284 bytes). The correct version
version has a size of 38126 bytes.</p> has a size of 38126 bytes.</p>
<ul> <ul>
<li>The code to detect a duplicate interface <li>The code to detect a duplicate interface
@ -495,8 +458,6 @@ it behaved just like "NAT_BEFORE_RULES=Yes".</li>
<ul> <ul>
<li> <li>
<p align="left">The IANA have just announced the allocation of subnet <p align="left">The IANA have just announced the allocation of subnet
221.0.0.0/8. This <a 221.0.0.0/8. This <a
href="http://www.shorewall.net/pub/shorewall/errata/1.3.2/rfc1918"> href="http://www.shorewall.net/pub/shorewall/errata/1.3.2/rfc1918">
@ -513,10 +474,10 @@ it behaved just like "NAT_BEFORE_RULES=Yes".</li>
(i.e., each packet is sent through the limit chain twice).</li> (i.e., each packet is sent through the limit chain twice).</li>
<li>An unnecessary jump to the policy <li>An unnecessary jump to the policy
chain is sometimes generated for a CONTINUE policy.</li> chain is sometimes generated for a CONTINUE policy.</li>
<li>When an option is given for more than <li>When an option is given for more
one interface in /etc/shorewall/interfaces then depending than one interface in /etc/shorewall/interfaces then
on the option, Shorewall may ignore all but the first depending on the option, Shorewall may ignore all but
appearence of the option. For example:<br> the first appearence of the option. For example:<br>
<br> <br>
net    eth0    dhcp<br> net    eth0    dhcp<br>
loc    eth1    dhcp<br> loc    eth1    dhcp<br>
@ -567,21 +528,18 @@ The "shorewall version" command will tell you which version
iptables version 1.2.3</font></h3> iptables version 1.2.3</font></h3>
<blockquote> <blockquote>
<p align="left">There are a couple of serious bugs in iptables 1.2.3 that <p align="left">There are a couple of serious bugs in iptables 1.2.3 that
prevent it from working with Shorewall. Regrettably, RedHat prevent it from working with Shorewall. Regrettably,
released this buggy iptables in RedHat 7.2. </p> RedHat released this buggy iptables in RedHat 7.2. </p>
<p align="left"> I have built a <a <p align="left"> I have built a <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3-3.i386.rpm"> href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3-3.i386.rpm">
corrected 1.2.3 rpm which you can download here</a>  and I have corrected 1.2.3 rpm which you can download here</a>  and I have
also built an <a also built an <a
href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm"> href="ftp://ftp.shorewall.net/pub/shorewall/iptables-1.2.4-1.i386.rpm"> iptables-1.2.4
iptables-1.2.4 rpm which you can download here</a>. If you are currently rpm which you can download here</a>. If you are currently running
running RedHat 7.1, you can install either of these RPMs RedHat 7.1, you can install either of these RPMs <b><u>before</u>
<b><u>before</u> </b>you upgrade to RedHat 7.2.</p> </b>you upgrade to RedHat 7.2.</p>
<p align="left"><font color="#ff6633"><b>Update 11/9/2001: </b></font>RedHat <p align="left"><font color="#ff6633"><b>Update 11/9/2001: </b></font>RedHat
has released an iptables-1.2.4 RPM of their own which you can has released an iptables-1.2.4 RPM of their own which you can
@ -590,7 +548,6 @@ iptables-1.2.4 rpm which you can download here</a>. If you are currently
</font>I have installed this RPM on my firewall and it works </font>I have installed this RPM on my firewall and it works
fine.</p> fine.</p>
<p align="left">If you would like to patch iptables 1.2.3 yourself, <p align="left">If you would like to patch iptables 1.2.3 yourself,
the patches are available for download. This <a the patches are available for download. This <a
href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/loglevel.patch">patch</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/loglevel.patch">patch</a>
@ -599,71 +556,54 @@ iptables-1.2.4 rpm which you can download here</a>. If you are currently
href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/tos.patch">patch</a> href="ftp://ftp.shorewall.net/pub/shorewall/errata/iptables-1.2.3/tos.patch">patch</a>
corrects a problem in handling the  TOS target.</p> corrects a problem in handling the  TOS target.</p>
<p align="left">To install one of the above patches:</p> <p align="left">To install one of the above patches:</p>
<ul> <ul>
<li>cd iptables-1.2.3/extensions</li> <li>cd iptables-1.2.3/extensions</li>
<li>patch -p0 &lt; <i>the-patch-file</i></li> <li>patch -p0 &lt; <i>the-patch-file</i></li>
</ul> </ul>
</blockquote> </blockquote>
<h3><a name="Debug"></a>Problems with kernels &gt;= 2.4.18 <h3><a name="Debug"></a>Problems with kernels &gt;= 2.4.18
and RedHat iptables</h3> and RedHat iptables</h3>
<blockquote> <blockquote>
<p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19 <p>Users who use RedHat iptables RPMs and who upgrade to kernel 2.4.18/19
may experience the following:</p> may experience the following:</p>
<blockquote> <blockquote>
<pre># shorewall start<br>Processing /etc/shorewall/shorewall.conf ...<br>Processing /etc/shorewall/params ...<br>Starting Shorewall...<br>Loading Modules...<br>Initializing...<br>Determining Zones...<br>Zones: net<br>Validating interfaces file...<br>Validating hosts file...<br>Determining Hosts in Zones...<br>Net Zone: eth0:0.0.0.0/0<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br></pre> <pre># shorewall start<br>Processing /etc/shorewall/shorewall.conf ...<br>Processing /etc/shorewall/params ...<br>Starting Shorewall...<br>Loading Modules...<br>Initializing...<br>Determining Zones...<br>Zones: net<br>Validating interfaces file...<br>Validating hosts file...<br>Determining Hosts in Zones...<br>Net Zone: eth0:0.0.0.0/0<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br>iptables: libiptc/libip4tc.c:380: do_check: Assertion<br>`h-&gt;info.valid_hooks == (1 &lt;&lt; 0 | 1 &lt;&lt; 3)' failed.<br>Aborted (core dumped)<br></pre>
</blockquote> </blockquote>
<p>The RedHat iptables RPM is compiled with debugging enabled but the <p>The RedHat iptables RPM is compiled with debugging enabled but the
user-space debugging code was not updated to reflect recent changes in user-space debugging code was not updated to reflect recent changes in
the Netfilter 'mangle' table. You can correct the problem the Netfilter 'mangle' table. You can correct the problem by
by installing <a installing <a
href="http://www.shorewall.net/pub/shorewall/iptables-1.2.5-1.i386.rpm"> href="http://www.shorewall.net/pub/shorewall/iptables-1.2.5-1.i386.rpm">
this iptables RPM</a>. If you are already running a 1.2.5 version this iptables RPM</a>. If you are already running a 1.2.5 version
of iptables, you will need to specify the --oldpackage option of iptables, you will need to specify the --oldpackage option
to rpm (e.g., "iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm").</p> to rpm (e.g., "iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm").</p>
</blockquote> </blockquote>
<h3><a name="SuSE"></a>Problems installing/upgrading <h3><a name="SuSE"></a>Problems installing/upgrading
RPM on SuSE</h3> RPM on SuSE</h3>
<p>If you find that rpm complains about a conflict with kernel &lt;=
<p>If you find that rpm complains about a conflict 2.2 yet you have a 2.4 kernel installed, simply use the "--nodeps"
with kernel &lt;= 2.2 yet you have a 2.4 kernel option to rpm.</p>
installed, simply use the "--nodeps" option to
rpm.</p>
<p>Installing: rpm -ivh --nodeps <i>&lt;shorewall rpm&gt;</i></p> <p>Installing: rpm -ivh --nodeps <i>&lt;shorewall rpm&gt;</i></p>
<p>Upgrading: rpm -Uvh --nodeps <i>&lt;shorewall rpm&gt;</i></p> <p>Upgrading: rpm -Uvh --nodeps <i>&lt;shorewall rpm&gt;</i></p>
<h3><a name="Multiport"></a><b>Problems with iptables version 1.2.7 and
MULTIPORT=Yes</b></h3>
<h3><a name="Multiport"></a><b>Problems with <p>The iptables 1.2.7 release of iptables has made an incompatible
iptables version 1.2.7 and MULTIPORT=Yes</b></h3> change to the syntax used to specify multiport match rules; as
a consequence, if you install iptables 1.2.7 you must
be running Shorewall 1.3.7a or later or:</p>
<p>The iptables 1.2.7 release of iptables has made
an incompatible change to the syntax used to
specify multiport match rules; as a consequence,
if you install iptables 1.2.7 you must be running
Shorewall 1.3.7a or later or:</p>
<ul> <ul>
<li>set MULTIPORT=No <li>set MULTIPORT=No
@ -679,8 +619,8 @@ to rpm (e.g., "iptables -Uvh --oldpackage iptables-1.2.5-1.i386.rpm")
<h3><a name="NAT"></a>Problems with RH Kernel 2.4.18-10 and NAT<br> <h3><a name="NAT"></a>Problems with RH Kernel 2.4.18-10 and NAT<br>
</h3> </h3>
/etc/shorewall/nat entries of the following form will result /etc/shorewall/nat entries of the following form will
in Shorewall being unable to start:<br> result in Shorewall being unable to start:<br>
<br> <br>
<pre>#EXTERNAL       INTERFACE       INTERNAL        ALL INTERFACES          LOCAL<br>192.0.2.22    eth0    192.168.9.22   yes     yes<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</pre> <pre>#EXTERNAL       INTERFACE       INTERNAL        ALL INTERFACES          LOCAL<br>192.0.2.22    eth0    192.168.9.22   yes     yes<br>#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE</pre>
@ -692,8 +632,8 @@ support for LOCAL=yes has never worked properly and 2.4.18-10 has
disabled it. The 2.4.19 kernel contains corrected support under a new disabled it. The 2.4.19 kernel contains corrected support under a new
kernel configuraiton option; see <a href="Documentation.htm#NAT">http://www.shorewall.net/Documentation.htm#NAT</a><br> kernel configuraiton option; see <a href="Documentation.htm#NAT">http://www.shorewall.net/Documentation.htm#NAT</a><br>
<p><font size="2"> Last updated 3/8/2003 - <p><font size="2"> Last updated 3/8/2003 - <a href="support.htm">Tom Eastep</a></font>
<a href="support.htm">Tom Eastep</a></font> </p> </p>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
@ -711,5 +651,6 @@ kernel configuraiton option; see <a href="Documentation.htm#NAT">http://www.s
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

89
Shorewall-docs/fallback.htm
View File

@ -1,74 +1,77 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Shorewall Fallback and Uninstall</title> <meta http-equiv="Content-Type"
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> content="text/html; charset=windows-1252">
<meta name="ProgId" content="FrontPage.Editor.Document"> <title>Shorewall Fallback and Uninstall</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
</head> </head>
<body>
<body> <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Fallback and Uninstall</font></h1>
<h1 align="center"><font color="#FFFFFF">Fallback and Uninstall</font></h1>
</td> </td>
</tr> </tr>
</tbody>
</table> </table>
<p><strong>Shorewall includes <p><strong>Shorewall includes a </strong><a href="#fallback"><strong>fallback
a </strong><a href="#fallback"><strong>fallback script</strong></a><strong> script</strong></a><strong> and an </strong><a href="#uninstall"><strong>uninstall
and an </strong><a href="#uninstall"><strong>uninstall script</strong></a><strong>.</strong></p> script</strong></a><strong>.</strong></p>
<h2><a name="fallback"></a>Falling Back to the Previous Version of Shorewall <h2><a name="fallback"></a>Falling Back to the Previous Version of Shorewall
using the Fallback Script</h2> using the Fallback Script</h2>
<p>If you install Shorewall and discover that <p>If you install Shorewall and discover that it doesn't work for you, you
it doesn't work for you, you can fall back to your previously can fall back to your previously installed version. To do that:</p>
installed version. To do that:</p>
<ul> <ul>
<li>cd to the distribution directory for the version <li>cd to the distribution directory for the version of Seattle
of Seattle Firewall <u>that you are Firewall <u>that you are currently running </u>(NOT the version
currently running </u>(NOT the version
that you want to fall back to).</li> that you want to fall back to).</li>
<li>Type &quot;./fallback.sh&quot;</li> <li>Type "./fallback.sh"</li>
</ul> </ul>
<h3><strong><u>Warning:</u> The fallback script <h3><strong><u>Warning:</u> The fallback script will replace /etc/shorewall/policy,
will replace /etc/shorewall/policy, /etc/shorewall/rules, /etc/shorewall/interfaces, /etc/shorewall/rules, /etc/shorewall/interfaces, /etc/shorewall/nat, /etc/shorewall/proxyarp
/etc/shorewall/nat, /etc/shorewall/proxyarp and /etc/shorewall/masq with the version of and /etc/shorewall/masq with the version of these files from before the current
these files from before the current version was installed. Any version was installed. Any changes to any of these files will be lost.</strong></h3>
changes to any of these files will be lost.</strong></h3>
<h2><a name="rpm"></a>Falling Back to the Previous Version of Shorewall using <h2><a name="rpm"></a>Falling Back to the Previous Version of Shorewall using
rpm</h2> rpm</h2>
<p>If your previous version of Shorewall was <p>If your previous version of Shorewall was installed using RPM, you may
installed using RPM, you may fall back to that version by typing fall back to that version by typing "rpm -Uvh --force &lt;old rpm&gt;" at
&quot;rpm -Uvh --force &lt;old rpm&gt;&quot; at a root shell a root shell prompt (Example: "rpm -Uvh --force /downloads/shorewall-3.1=0noarch.rpm"
prompt (Example: &quot;rpm -Uvh --force /downloads/shorewall-3.1=0noarch.rpm&quot; would fall back to the 3.1-0 would fall back to the 3.1-0 version of Shorewall).</p>
version of Shorewall).</p>
<h2><a name="uninstall"></a>Uninstalling Shorewall</h2> <h2><a name="uninstall"></a>Uninstalling Shorewall</h2>
<p>If you no longer wish to use Shorewall, you <p>If you no longer wish to use Shorewall, you may remove it by:</p>
may remove it by:</p>
<ul> <ul>
<li>cd to the distribution directory for the version <li>cd to the distribution directory for the version of Shorewall
of Shorewall that you have installed.</li> that you have installed.</li>
<li>type &quot;./uninstall.sh&quot;</li> <li>type "./uninstall.sh"</li>
</ul> </ul>
<p>If you installed using an rpm, at a root shell prompt <p>If you installed using an rpm, at a root shell prompt type "rpm -e shorewall".</p>
type &quot;rpm -e shorewall&quot;.</p>
<p><font size="2">Last updated 3/26/2001 - </font><font size="2"> <p><font size="2">Last updated 3/26/2001 - </font><font size="2"> <a
<a href="support.htm">Tom href="support.htm">Tom Eastep</a></font> </p>
Eastep</a></font> </p> <a href="copyright.htm"><font size="2">Copyright</font> © <font
<a href="copyright.htm"><font size="2">Copyright</font> size="2">2001, 2002 Thomas M. Eastep.</font></a><br>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></body></html> </body>
</html>

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<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -75,5 +75,6 @@ included with Mailman-2.1.
<br> <br>
<br> <br>
<br> <br>
<br>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Shorewall Kernel Configuration</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
</head>
<body> <meta http-equiv="Content-Type"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90"> content="text/html; charset=windows-1252">
<title>Shorewall Kernel Configuration</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#FFFFFF">Kernel Configuration</font></h1> <h1 align="center"><font color="#ffffff">Kernel Configuration</font></h1>
</td> </td>
</tr> </tr>
</tbody>
</table> </table>
<p>For information regarding configuring and building GNU/Linux kernels, see <a href="http://www.kernelnewbies.org">http://www.kernelnewbies.org</a>.</p>
<p>For information regarding configuring and building GNU/Linux kernels,
see <a href="http://www.kernelnewbies.org">http://www.kernelnewbies.org</a>.</p>
<p>Here's a screen shot of my Network Options Configuration:</p> <p>Here's a screen shot of my Network Options Configuration:</p>
<blockquote>
<p>&nbsp;<img border="0" src="images/netopts.jpg" width="609" height="842"></p>
</blockquote>
<p>While not all of the options that I've selected are required, they should be
sufficient for most applications. Here's an excerpt from the corresponding .config
file (Note: If you are running a kernel older than 2.4.17, be sure to select
CONFIG_NETLINK and CONFIG_RTNETLINK):</p>
<blockquote> <blockquote>
<font SIZE="2"> <p> <img border="0" src="images/netopts.jpg" width="609" height="842">
</p>
</blockquote>
<p>While not all of the options that I've selected are required, they should
be sufficient for most applications. Here's an excerpt from the corresponding
.config file (Note: If you are running a kernel older than 2.4.17, be sure
to select CONFIG_NETLINK and CONFIG_RTNETLINK):</p>
<blockquote> <font size="2">
<p>#<br> <p>#<br>
# Networking options<br> # Networking options<br>
#<br> #<br>
@ -55,16 +69,18 @@ CONFIG_NETLINK and CONFIG_RTNETLINK):</p>
# CONFIG_ARPD is not set<br> # CONFIG_ARPD is not set<br>
CONFIG_INET_ECN=y<br> CONFIG_INET_ECN=y<br>
CONFIG_SYN_COOKIES=y</p> CONFIG_SYN_COOKIES=y</p>
</font> </font> </blockquote>
</blockquote>
<p>Here's a screen shot of my Netfilter configuration:</p> <p>Here's a screen shot of my Netfilter configuration:</p>
<blockquote>
<p><img border="0" src="images/menuconfig.jpg" width="609" height="842"></p> <blockquote>
</blockquote> <p><img border="0" src="images/menuconfig.jpg" width="609"
height="842">
</p>
</blockquote>
<p>Here's an excerpt from the corresponding .config file.</p> <p>Here's an excerpt from the corresponding .config file.</p>
<blockquote> <blockquote>
<p><font size="2">#<br> <p><font size="2">#<br>
# IP: Netfilter Configuration<br> # IP: Netfilter Configuration<br>
@ -97,13 +113,16 @@ CONFIG_NETLINK and CONFIG_RTNETLINK):</p>
CONFIG_IP_NF_TARGET_TCPMSS=y<br> CONFIG_IP_NF_TARGET_TCPMSS=y<br>
# CONFIG_IPV6 is not set</font><font face="Courier"><br> # CONFIG_IPV6 is not set</font><font face="Courier"><br>
</font></p> </font></p>
</blockquote> </blockquote>
<p>Note that I have built everything I need into the kernel except for the FTP
connection tracking and NAT modules. I have also run successfully with all of <p>Note that I have built everything I need into the kernel except for the
the options selected above built as modules:</p> FTP connection tracking and NAT modules. I have also run successfully with
all of the options selected above built as modules:</p>
<blockquote> <blockquote>
<p><img border="0" src="images/menuconfig1.jpg" width="609" height="842"></p> <p><img border="0" src="images/menuconfig1.jpg" width="609"
height="842">
</p>
<p><font size="2">#<br> <p><font size="2">#<br>
# IP: Netfilter Configuration<br> # IP: Netfilter Configuration<br>
@ -136,11 +155,11 @@ the options selected above built as modules:</p>
CONFIG_IP_NF_TARGET_TCPMSS=m<br> CONFIG_IP_NF_TARGET_TCPMSS=m<br>
# CONFIG_IPV6 is not set<br> # CONFIG_IPV6 is not set<br>
</font></p> </font></p>
</blockquote>
</blockquote> <p><font size="2">Last updated 3/10/2002 - </font><font size="2"> <a
href="support.htm">Tom Eastep</a></font> </p>
<p><font size="2">Last updated 3/10/2002 - </font><font size="2"> <a href="copyright.htm"><font size="2">Copyright</font> © <font
<a href="support.htm">Tom size="2">2001, 2002 Thomas M. Eastep.</font></a><br>
Eastep</a></font> </p> </body>
<a href="copyright.htm"><font size="2">Copyright</font> </html>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></body></html>

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@ -16,7 +16,7 @@
</head> </head>
<body> <body>
<table height="90" bgcolor="#400169" id="AutoNumber1" width="100%" <table height="90" bgcolor="#3366ff" id="AutoNumber1" width="100%"
style="border-collapse: collapse;" cellspacing="0" cellpadding="0" style="border-collapse: collapse;" cellspacing="0" cellpadding="0"
border="0"> border="0">
<tbody> <tbody>
@ -50,12 +50,14 @@
height="84" alt="(Postfix Logo)"> height="84" alt="(Postfix Logo)">
</a><br> </a><br>
<div align="left"><a href="http://www.spamassassin.org"><img <div align="left"><a href="http://www.spamassassin.org"><img
src="images/ninjalogo.png" alt="" width="110" height="42" align="right" src="images/ninjalogo.png" alt="" width="110" height="42" align="right"
border="0"> border="0">
</a> </div> </a> </div>
<br> <br>
<div align="right"><b><font color="#ffffff"><br> <div align="right"><b><font color="#ffffff"><br>
</font></b><br> </font></b><br>
</div> </div>
@ -75,14 +77,14 @@
<h2 align="left">Not able to Post Mail to shorewall.net?</h2> <h2 align="left">Not able to Post Mail to shorewall.net?</h2>
<p align="left">You can report such problems by sending mail to tmeastep <p align="left">You can report such problems by sending mail to tmeastep at
at hotmail dot com.</p> hotmail dot com.</p>
<h2>A Word about the SPAM Filters at Shorewall.net <a <h2>A Word about the SPAM Filters at Shorewall.net <a
href="http://osirusoft.com/"> </a></h2> href="http://osirusoft.com/"> </a></h2>
<p>Please note that the mail server at shorewall.net <p>Please note that the mail server at shorewall.net checks
checks incoming mail:<br> incoming mail:<br>
</p> </p>
<ol> <ol>
@ -92,8 +94,8 @@ checks incoming mail:<br>
</li> </li>
<li>to ensure that the sender address is fully <li>to ensure that the sender address is fully
qualified.</li> qualified.</li>
<li>to verify that the sender's domain has an <li>to verify that the sender's domain has
A or MX record in DNS.</li> an A or MX record in DNS.</li>
<li>to ensure that the host name in the HELO/EHLO <li>to ensure that the host name in the HELO/EHLO
command is a valid fully-qualified DNS name that resolves.</li> command is a valid fully-qualified DNS name that resolves.</li>
@ -101,19 +103,19 @@ checks incoming mail:<br>
<h2>Please post in plain text</h2> <h2>Please post in plain text</h2>
A growing number of MTAs serving list subscribers are A growing number of MTAs serving list subscribers are
rejecting all HTML traffic. At least one MTA has gone so far as rejecting all HTML traffic. At least one MTA has gone so far as to
to blacklist shorewall.net "for continuous abuse" because it has been blacklist shorewall.net "for continuous abuse" because it has been
my policy to allow HTML in list posts!!<br> my policy to allow HTML in list posts!!<br>
<br> <br>
I think that blocking all HTML is a Draconian way to I think that blocking all HTML is a Draconian way to
control spam and that the ultimate losers here are not the spammers control spam and that the ultimate losers here are not the spammers
but the list subscribers whose MTAs are bouncing all shorewall.net but the list subscribers whose MTAs are bouncing all shorewall.net
mail. As one list subscriber wrote to me privately "These e-mail admin's mail. As one list subscriber wrote to me privately "These e-mail admin's
need to get a <i>(explitive deleted)</i> life instead of trying to rid need to get a <i>(explitive deleted)</i> life instead of trying to rid
the planet of HTML based e-mail". Nevertheless, to allow subscribers to the planet of HTML based e-mail". Nevertheless, to allow subscribers
receive list posts as must as possible, I have now configured the list to receive list posts as must as possible, I have now configured the
server at shorewall.net to strip all HTML from outgoing posts. This list server at shorewall.net to strip all HTML from outgoing posts.
means that HTML-only posts will be bounced by the list server.<br> This means that HTML-only posts will be bounced by the list server.<br>
<p align="left"> <b>Note: </b>The list server limits posts to 120kb.<br> <p align="left"> <b>Note: </b>The list server limits posts to 120kb.<br>
</p> </p>
@ -157,30 +159,30 @@ means that HTML-only posts will be bounced by the list server.<br>
name="words" value=""> <input type="submit" value="Search"> </p> name="words" value=""> <input type="submit" value="Search"> </p>
</form> </form>
<h2 align="left"><font color="#ff0000">Please do not try to download the <h2 align="left"><font color="#ff0000">Please do not try to download the entire
entire Archive -- it is 75MB (and growing daily) and my slow DSL line simply Archive -- it is 75MB (and growing daily) and my slow DSL line simply won't
won't stand the traffic. If I catch you, you will be blacklisted.<br> stand the traffic. If I catch you, you will be blacklisted.<br>
</font></h2> </font></h2>
<h2 align="left">Shorewall CA Certificate</h2> <h2 align="left">Shorewall CA Certificate</h2>
If you want to trust X.509 certificates issued If you want to trust X.509 certificates issued
by Shoreline Firewall (such as the one used on my web site), you by Shoreline Firewall (such as the one used on my web site),
may <a href="Shorewall_CA_html.html">download and install my CA certificate</a> you may <a href="Shorewall_CA_html.html">download and install my CA certificate</a>
in your browser. If you don't wish to trust my certificates in your browser. If you don't wish to trust my certificates
then you can either use unencrypted access when subscribing to Shorewall then you can either use unencrypted access when subscribing to
mailing lists or you can use secure access (SSL) and accept the Shorewall mailing lists or you can use secure access (SSL) and
server's certificate when prompted by your browser.<br> accept the server's certificate when prompted by your browser.<br>
<h2 align="left">Shorewall Users Mailing List</h2> <h2 align="left">Shorewall Users Mailing List</h2>
<p align="left">The Shorewall Users Mailing list provides a way for users <p align="left">The Shorewall Users Mailing list provides a way for users
to get answers to questions and to report problems. Information to get answers to questions and to report problems. Information
of general interest to the Shorewall user community is also posted of general interest to the Shorewall user community is also
to this list.</p> posted to this list.</p>
<p align="left"><b>Before posting a problem report to this list, please see <p align="left"><b>Before posting a problem report to this list, please see
the <a href="http://www.shorewall.net/support.htm">problem the <a href="http://www.shorewall.net/support.htm">problem
reporting guidelines</a>.</b></p> reporting guidelines</a>.</b></p>
<p align="left">To subscribe to the mailing list:<br> <p align="left">To subscribe to the mailing list:<br>
</p> </p>
@ -200,9 +202,9 @@ reporting guidelines</a>.</b></p>
<p align="left">The list archives are at <a <p align="left">The list archives are at <a
href="http://lists.shorewall.net/pipermail/shorewall-users/index.html">http://lists.shorewall.net/pipermail/shorewall-users</a>.</p> href="http://lists.shorewall.net/pipermail/shorewall-users/index.html">http://lists.shorewall.net/pipermail/shorewall-users</a>.</p>
<p align="left">Note that prior to 1/1/2002, the mailing list was hosted at <p align="left">Note that prior to 1/1/2002, the mailing list was hosted
<a href="http://sourceforge.net">Sourceforge</a>. The archives from that list at <a href="http://sourceforge.net">Sourceforge</a>. The archives from that
may be found at <a list may be found at <a
href="http://www.geocrawler.com/lists/3/Sourceforge/9327/0/">www.geocrawler.com/lists/3/Sourceforge/9327/0/</a>.</p> href="http://www.geocrawler.com/lists/3/Sourceforge/9327/0/">www.geocrawler.com/lists/3/Sourceforge/9327/0/</a>.</p>
<h2 align="left">Shorewall Announce Mailing List</h2> <h2 align="left">Shorewall Announce Mailing List</h2>
@ -267,17 +269,17 @@ may be found at <a
<p align="left">Down at the bottom of that page is the following text: <p align="left">Down at the bottom of that page is the following text:
" To <b>unsubscribe</b> from <i>&lt;list name&gt;</i>, get " To <b>unsubscribe</b> from <i>&lt;list name&gt;</i>, get
a password reminder, or change your subscription options enter a password reminder, or change your subscription options
your subscription email address:". Enter your email address enter your subscription email address:". Enter your email
in the box and click on the "<b>Unsubscribe</b> or edit options" address in the box and click on the "<b>Unsubscribe</b> or edit
button.</p> options" button.</p>
</li> </li>
<li> <li>
<p align="left">There will now be a box where you can enter your password <p align="left">There will now be a box where you can enter your password
and click on "Unsubscribe"; if you have forgotten your password, and click on "Unsubscribe"; if you have forgotten your password,
there is another button that will cause your password to be there is another button that will cause your password to be
emailed to you.</p> emailed to you.</p>
</li> </li>
</ul> </ul>
@ -290,9 +292,10 @@ emailed to you.</p>
<p align="left"><font size="2">Last updated 7/7/2003 - <a <p align="left"><font size="2">Last updated 7/7/2003 - <a
href="http://www.shorewall.net/support.htm">Tom Eastep</a></font></p> href="http://www.shorewall.net/support.htm">Tom Eastep</a></font></p>
<p align="left"><a href="copyright.htm"> <font size="2">Copyright</font> <p align="left"><a href="copyright.htm"> <font size="2">Copyright</font> ©
© <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br> <br>
<br>
</body> </body>
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@ -6,6 +6,7 @@
content="text/html; charset=windows-1252"> content="text/html; charset=windows-1252">
<title>My Shorewall Configuration</title> <title>My Shorewall Configuration</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="ProgId" content="FrontPage.Editor.Document">
@ -16,7 +17,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -36,8 +37,8 @@
<p><big><font color="#ff0000"><b>Warning 1: </b></font><b><small>I</small></b></big><big><b><small> <p><big><font color="#ff0000"><b>Warning 1: </b></font><b><small>I</small></b></big><big><b><small>
use a combination of Static NAT and Proxy ARP, neither of which are use a combination of Static NAT and Proxy ARP, neither of which are
relevant to a simple configuration with a single public IP address.</small></b></big><big><b><small> relevant to a simple configuration with a single public IP address.</small></b></big><big><b><small>
If you have just a single public IP address, most of what you see If you have just a single public IP address, most of what you see here
here won't apply to your setup so beware of copying parts of this configuration won't apply to your setup so beware of copying parts of this configuration
and expecting them to work for you. What you copy may or may not work and expecting them to work for you. What you copy may or may not work
in your configuration.<br> in your configuration.<br>
</small></b></big></p> </small></b></big></p>
@ -73,21 +74,21 @@ and a Wireless network connected to eth3 (192.168.3.0/24).</p>
use the laptop isn't very far (25 feet or so), using a WAC11 (CardBus use the laptop isn't very far (25 feet or so), using a WAC11 (CardBus
wireless card) has proved very unsatisfactory (lots of lost connections). wireless card) has proved very unsatisfactory (lots of lost connections).
By replacing the WAC11 with the WET11 wireless bridge, I have virtually By replacing the WAC11 with the WET11 wireless bridge, I have virtually
eliminated these problems (Being an old radio tinkerer (K7JPV), I was eliminated these problems (Being an old radio tinkerer (K7JPV), I was also
also able to eliminate the disconnects by hanging a piece of aluminum foil able to eliminate the disconnects by hanging a piece of aluminum foil on
on the family room wall. Needless to say, my wife Tarry rejected that as the family room wall. Needless to say, my wife Tarry rejected that as a
a permanent solution :-).</li> permanent solution :-).</li>
</ul> </ul>
<p> The firewall runs on a 256MB PII/233 with RH9.0.</p> <p> The firewall runs on a 256MB PII/233 with RH9.0.</p>
<p> Wookie and the Firewall both run Samba and the Firewall acts as a <p> Wookie and the Firewall both run Samba and the Firewall acts as a WINS
WINS server.<br> server.<br>
</p> </p>
<p>Wookie is in its own 'whitelist' zone called 'me' which is <p>Wookie is in its own 'whitelist' zone called 'me' which is embedded
embedded in the local zone.</p> in the local zone.</p>
<p>The wireless network connects to eth3 via a LinkSys WAP11.  In additional <p>The wireless network connects to eth3 via a LinkSys WAP11.  In additional
to using the rather weak WEP 40-bit encryption (64-bit with the 24-bit to using the rather weak WEP 40-bit encryption (64-bit with the 24-bit
@ -97,23 +98,23 @@ would probably add IPSEC or something similar to my WiFi-&gt;local connections
</p> </p>
<p> The single system in the DMZ (address 206.124.146.177) runs postfix, <p> The single system in the DMZ (address 206.124.146.177) runs postfix,
Courier IMAP (imaps and pop3), DNS, a Web server (Apache) and Courier IMAP (imaps and pop3), DNS, a Web server (Apache) and an
an FTP server (Pure-ftpd). The system also runs fetchmail to fetch FTP server (Pure-ftpd). The system also runs fetchmail to fetch
our email from our old and current ISPs. That server is managed through our email from our old and current ISPs. That server is managed through
Proxy ARP.</p> Proxy ARP.</p>
<p> The firewall system itself runs a DHCP server that serves the local <p> The firewall system itself runs a DHCP server that serves the local
network. It also runs Postfix which is configured as a Virus network. It also runs Postfix which is configured as a Virus and
and Spam filter with all incoming mail then being forwarded to the MTA Spam filter with all incoming mail then being forwarded to the MTA in
in the DMZ.</p> the DMZ.</p>
<p> All administration and publishing is done using ssh/scp. I have X installed <p> All administration and publishing is done using ssh/scp. I have X installed
on the firewall but no X server or desktop is installed. X applications on the firewall but no X server or desktop is installed. X applications
tunnel through SSH to XWin.exe running on Ursa. The server does have a desktop tunnel through SSH to XWin.exe running on Ursa. The server does have a
environment installed and that desktop environment is available via XDMCP desktop environment installed and that desktop environment is available
from the local zone. For the most part though, X tunneled through SSH is via XDMCP from the local zone. For the most part though, X tunneled through
used for server administration and the server runs at run level 3 (multi-user SSH is used for server administration and the server runs at run level 3
console mode on RedHat).</p> (multi-user console mode on RedHat).</p>
<p> I run an SNMP server on my firewall to serve <a <p> I run an SNMP server on my firewall to serve <a
href="http://www.ee.ethz.ch/%7Eoetiker/webtools/mrtg/"> MRTG</a> running href="http://www.ee.ethz.ch/%7Eoetiker/webtools/mrtg/"> MRTG</a> running
@ -128,11 +129,12 @@ console mode on RedHat).</p>
<p>The ethernet interface in the Server is configured with IP address <p>The ethernet interface in the Server is configured with IP address
206.124.146.177, netmask 255.255.255.0. The server's default gateway 206.124.146.177, netmask 255.255.255.0. The server's default gateway
is 206.124.146.254 (Router at my ISP. This is the same default is 206.124.146.254 (Router at my ISP. This is the same
gateway used by the firewall itself). On the firewall, default gateway used by the firewall itself). On the firewall,
Shorewall automatically adds a host route to Shorewall automatically adds a host route to
206.124.146.177 through eth1 (192.168.2.1) because of 206.124.146.177 through eth1 (192.168.2.1) because
the entry in /etc/shorewall/proxyarp (see below).</p> of the entry in /etc/shorewall/proxyarp (see
below).</p>
<p>Ursa (192.168.1.5 AKA 206.124.146.178) runs a PPTP server for Road Warrior <p>Ursa (192.168.1.5 AKA 206.124.146.178) runs a PPTP server for Road Warrior
access.<br> access.<br>
@ -164,8 +166,8 @@ TEXAS=<i>&lt;ip address of gateway in Dallas&gt;</i><br>LOG=info<br></pre>
<h3>Interfaces File: </h3> <h3>Interfaces File: </h3>
<blockquote> <blockquote>
<p> This is set up so that I can start the firewall before bringing up my <p> This is set up so that I can start the firewall before bringing up
Ethernet interfaces. </p> my Ethernet interfaces. </p>
</blockquote> </blockquote>
<blockquote> <blockquote>
@ -240,5 +242,6 @@ Ethernet interfaces. </p>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

29
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@ -12,7 +12,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -23,15 +23,15 @@
</tbody> </tbody>
</table> </table>
<br> <br>
Shorewall 'Ping' management has evolved over time with the latest change Shorewall 'Ping' management has evolved over time with the latest
coming in Shorewall version 1.4.0. To find out which version of Shorewall change coming in Shorewall version 1.4.0. To find out which version of
you are running, at a shell prompt type "<font color="#009900"><b>/sbin/shorewall Shorewall you are running, at a shell prompt type "<font color="#009900"><b>/sbin/shorewall
version</b></font>". If that command gives you an error, it's time to upgrade version</b></font>". If that command gives you an error, it's time to upgrade
since you have a very old version of Shorewall installed (1.2.4 or earlier).<br> since you have a very old version of Shorewall installed (1.2.4 or earlier).<br>
<h2>Shorewall Versions &gt;= 1.4.0</h2> <h2>Shorewall Versions &gt;= 1.4.0</h2>
In Shoreall 1.4.0 and later version, ICMP echo-request's are treated just In Shoreall 1.4.0 and later version, ICMP echo-request's are treated just
like any other connection request.<br> like any other connection request.<br>
<br> <br>
In order to accept ping requests from zone z1 to zone z2 where the policy In order to accept ping requests from zone z1 to zone z2 where the policy
for z1 to z2 is not ACCEPT, you need a rule in /etc/shoreall/rules of the for z1 to z2 is not ACCEPT, you need a rule in /etc/shoreall/rules of the
@ -70,11 +70,11 @@ then you need a rule of the form:<br>
</blockquote> </blockquote>
<h2>Shorewall Versions &gt;= 1.3.14 &nbsp;and &lt; 1.4.0 with OLD_PING_HANDLING=No <h2>Shorewall Versions &gt;= 1.3.14 &nbsp;and &lt; 1.4.0 with OLD_PING_HANDLING=No
in /etc/shorewall/shorewall.conf</h2> in /etc/shorewall/shorewall.conf</h2>
In 1.3.14, Ping handling was put under control of the rules and policies In 1.3.14, Ping handling was put under control of the rules and policies
just like any other connection request. In order to accept ping requests just like any other connection request. In order to accept ping requests
from zone z1 to zone z2 where the policy for z1 to z2 is not ACCEPT, you from zone z1 to zone z2 where the policy for z1 to z2 is not ACCEPT, you
need a rule in /etc/shoreall/rules of the form:<br> need a rule in /etc/shoreall/rules of the form:<br>
<blockquote>ACCEPT&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp; <blockquote>ACCEPT&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp;
</i>icmp&nbsp;&nbsp;&nbsp; 8<br> </i>icmp&nbsp;&nbsp;&nbsp; 8<br>
@ -140,7 +140,7 @@ and simple routing.</li>
for the interface that receives the ping request then the request will for the interface that receives the ping request then the request will
be responded to with an ICMP echo-reply.</li> be responded to with an ICMP echo-reply.</li>
<li>If <b>noping</b> is specified for the interface that receives <li>If <b>noping</b> is specified for the interface that receives
the ping request then the request is ignored.</li> the ping request then the request is ignored.</li>
<li>If <b>filterping </b>is specified for the interface then the <li>If <b>filterping </b>is specified for the interface then the
request is passed to the rules/policy evaluation.</li> request is passed to the rules/policy evaluation.</li>
@ -158,8 +158,8 @@ request is passed to the rules/policy evaluation.</li>
Example 1. Accept pings from the net to the dmz (pings are responded Example 1. Accept pings from the net to the dmz (pings are responded
to with an ICMP echo-reply):<br> to with an ICMP echo-reply):<br>
<br> <br>
&nbsp;&nbsp;&nbsp; ACCEPT&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp; dmz&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; ACCEPT&nbsp;&nbsp;&nbsp; net&nbsp;&nbsp;&nbsp;
icmp&nbsp;&nbsp;&nbsp; 8<br> dmz&nbsp;&nbsp;&nbsp; icmp&nbsp;&nbsp;&nbsp; 8<br>
<br> <br>
Example 2. Drop pings from the net to the firewall<br> Example 2. Drop pings from the net to the firewall<br>
<br> <br>
@ -167,8 +167,8 @@ request is passed to the rules/policy evaluation.</li>
icmp&nbsp;&nbsp;&nbsp; 8<br> icmp&nbsp;&nbsp;&nbsp; 8<br>
<h3>Policy Evaluation</h3> <h3>Policy Evaluation</h3>
If no applicable rule is found, then the policy for the source to the If no applicable rule is found, then the policy for the source to
destination is applied.<br> the destination is applied.<br>
<ol> <ol>
<li>If the relevant policy is ACCEPT then the request is responded <li>If the relevant policy is ACCEPT then the request is responded
@ -176,7 +176,7 @@ request is passed to the rules/policy evaluation.</li>
<li>If <b>FORWARDPING</b> is set to Yes in /etc/shorewall/shorewall.conf <li>If <b>FORWARDPING</b> is set to Yes in /etc/shorewall/shorewall.conf
then the request is responded to with an ICMP echo-reply.</li> then the request is responded to with an ICMP echo-reply.</li>
<li>Otherwise, the relevant REJECT or DROP policy is used and the <li>Otherwise, the relevant REJECT or DROP policy is used and the
request is either rejected or simply ignored.</li> request is either rejected or simply ignored.</li>
</ol> </ol>
@ -185,6 +185,7 @@ request is either rejected or simply ignored.</li>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font <p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
</body> </body>
</html> </html>

46
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -54,8 +54,8 @@
<blockquote> <blockquote>
<p>UDP Port 53. If you are configuring a DNS client, you will probably want <p>UDP Port 53. If you are configuring a DNS client, you will probably want
to open TCP Port 53 as well.<br> to open TCP Port 53 as well.<br>
If you are configuring a server, only open TCP Port 53 if you will If you are configuring a server, only open TCP Port 53 if you
return long replies to queries or if you need to enable ZONE transfers. In will return long replies to queries or if you need to enable ZONE transfers. In
the latter case, be sure that your server is properly configured.</p> the latter case, be sure that your server is properly configured.</p>
</blockquote> </blockquote>
@ -81,23 +81,30 @@ to open TCP Port 53 as well.<br>
<a href="IPSEC.htm">here</a> and <a href="VPN.htm">here</a>).</p> <a href="IPSEC.htm">here</a> and <a href="VPN.htm">here</a>).</p>
</blockquote> </blockquote>
<p>SMTP</p> <p>SMTP (Email)</p>
<blockquote> <blockquote>
<p> TCP Port 25.</p> <p> TCP Port 25.</p>
</blockquote> </blockquote>
<p>RealPlayer<br> <p>RealPlayer<br>
</p> </p>
<blockquote> <blockquote>
<p>UDP Port 6790 inbound<br> <p>UDP Port 6790 inbound<br>
</p> </p>
</blockquote> </blockquote>
<p>POP3</p> <p>POP3</p>
<blockquote> <blockquote>
<p>TCP Port 110.</p> <p>TCP Port 110 (Secure = TCP Port 995)<br>
</blockquote> </p>
</blockquote>
<p>IMAP<br>
</p>
<blockquote>TCP Port 143 (Secure = TCP Port 993)<br>
</blockquote>
<p>TELNET</p> <p>TELNET</p>
@ -130,15 +137,15 @@ to open TCP Port 53 as well.<br>
href="Documentation.htm#Rules">the /etc/shorewall/rules documentation</a>,</p> href="Documentation.htm#Rules">the /etc/shorewall/rules documentation</a>,</p>
<p>For a client, you must open outbound TCP port 21 and be sure that your <p>For a client, you must open outbound TCP port 21 and be sure that your
kernel is compiled to support FTP connection tracking. If you build this kernel is compiled to support FTP connection tracking. If you build
support as a module, Shorewall will automatically load the module from this support as a module, Shorewall will automatically load the module
/var/lib/&lt;<i>kernel version</i>&gt;/kernel/net/ipv4/netfilter. <br> from /var/lib/&lt;<i>kernel version</i>&gt;/kernel/net/ipv4/netfilter. <br>
</p> </p>
<p>If you run an FTP server on a nonstandard port or you need to access <p>If you run an FTP server on a nonstandard port or you need to access
such a server, then you must specify that port in /etc/shorewall/modules. such a server, then you must specify that port in /etc/shorewall/modules.
For example, if you run an FTP server that listens on port 49 then you would For example, if you run an FTP server that listens on port 49 then you
have:<br> would have:<br>
</p> </p>
<blockquote> <blockquote>
@ -192,7 +199,9 @@ starts, then you should include the port list in /etc/modules.conf:<br>
<p>Traceroute</p> <p>Traceroute</p>
<blockquote> <blockquote>
<p>UDP ports 33434 through 33434+<i>&lt;max number of hops&gt;</i>-1</p> <p>UDP ports 33434 through 33434+<i>&lt;max number of hops&gt;</i>-1<br>
ICMP type 8 ('ping')<br>
</p>
</blockquote> </blockquote>
<p>NFS<br> <p>NFS<br>
@ -225,16 +234,9 @@ starts, then you should include the port list in /etc/modules.conf:<br>
<p>Still looking? Try <a <p>Still looking? Try <a
href="http://www.networkice.com/advice/Exploits/Ports"> http://www.networkice.com/advice/Exploits/Ports</a></p> href="http://www.networkice.com/advice/Exploits/Ports"> http://www.networkice.com/advice/Exploits/Ports</a></p>
<p><font size="2">Last updated 5/5/2003 - </font><font size="2"> <a <p><font size="2">Last updated 7/16/2003 - </font><font size="2"> <a
href="support.htm">Tom Eastep</a></font> </p> href="support.htm">Tom Eastep</a></font> </p>
<a href="copyright.htm"><font size="2">Copyright</font> © <font <a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
</body> </body>
</html> </html>

54
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -26,16 +26,17 @@
</tbody> </tbody>
</table> </table>
<font size="3">"I have fought with IPtables for untold hours. First I tried <font size="3">"I have fought with IPtables for untold hours. First I
the SuSE firewall, which worked for 80% of what I needed. Then gShield, which tried the SuSE firewall, which worked for 80% of what I needed. Then gShield,
also worked for 80%. Then I set out to write my own IPtables parser in shell which also worked for 80%. Then I set out to write my own IPtables parser
and awk, which was a lot of fun but never got me past the "hey, cool" stage. in shell and awk, which was a lot of fun but never got me past the "hey,
Then I discovered Shorewall. After about an hour, everything just worked. cool" stage. Then I discovered Shorewall. After about an hour, everything
I am stunned, and very grateful"</font> -- ES, Phoenix AZ, USA.<br> just worked. I am stunned, and very grateful"</font> -- ES, Phoenix AZ, USA.<br>
<p>"The configuration is intuitive and flexible, and much easier than any <p>"The configuration is intuitive and flexible, and much easier than any
of the other iptables-based firewall programs out there. After sifting through of the other iptables-based firewall programs out there. After sifting through
many other scripts, it is obvious that yours is the most well thought-out many other scripts, it is obvious that yours is the most well thought-out
and complete one available." -- BC, USA</p> and complete one available." -- BC, USA</p>
<p>"I just installed Shorewall after weeks of messing with ipchains/iptables <p>"I just installed Shorewall after weeks of messing with ipchains/iptables
and I had it up and running in under 20 minutes!" -- JL, Ohio<br> and I had it up and running in under 20 minutes!" -- JL, Ohio<br>
@ -46,16 +47,16 @@ was 'months' for me, and I think I needed two minutes more:<br>
<ul> <ul>
<li>One to see that I had no Internet access from the firewall itself.</li> <li>One to see that I had no Internet access from the firewall itself.</li>
<li>Other to see that this was the default configuration, and it was <li>Other to see that this was the default configuration, and it was
enough to uncomment a line in /etc/shorewall/policy.<br> enough to uncomment a line in /etc/shorewall/policy.<br>
</li> </li>
</ul> </ul>
Minutes instead of months! Congratulations and thanks for such a simple Minutes instead of months! Congratulations and thanks for such a simple
and well documented thing for something as huge as iptables." -- JV, Spain. and well documented thing for something as huge as iptables." -- JV, Spain.
<p>"I downloaded Shorewall 1.2.0 and installed it on Mandrake 8.1 without <p>"I downloaded Shorewall 1.2.0 and installed it on Mandrake 8.1 without
any problems. Your documentation is great and I really appreciate your any problems. Your documentation is great and I really appreciate your
network configuration info. That really helped me out alot. THANKS!!!" network configuration info. That really helped me out alot. THANKS!!!"
-- MM. </p> -- MM. </p>
<p>"[Shorewall is a] great, great project. I've used/tested may firewall <p>"[Shorewall is a] great, great project. I've used/tested may firewall
@ -63,37 +64,37 @@ network configuration info. That really helped me out alot. THANKS!!!"
</p> </p>
<p>"Never in my +12 year career as a sys admin have I witnessed someone <p>"Never in my +12 year career as a sys admin have I witnessed someone
so relentless in developing a secure, state of the art, safe and useful so relentless in developing a secure, state of the art, safe and
product as the Shorewall firewall package for no cost or obligation involved." useful product as the Shorewall firewall package for no cost or obligation
-- Mario Kerecki, Toronto </p> involved." -- Mario Kerecki, Toronto </p>
<p>"one time more to report, that your great shorewall in the latest release <p>"one time more to report, that your great shorewall in the latest release
1.2.9 is working fine for me with SuSE Linux 7.3! I now have 7 machines 1.2.9 is working fine for me with SuSE Linux 7.3! I now have 7 machines
up and running with shorewall on several versions - starting with 1.2.2 up and running with shorewall on several versions - starting with 1.2.2
up to the new 1.2.9 and I never have encountered any problems!" -- up to the new 1.2.9 and I never have encountered any problems!" -- SM,
SM, Germany</p> Germany</p>
<p>"You have the best support of any other package I've ever used." <p>"You have the best support of any other package I've ever used."
-- SE, US </p> -- SE, US </p>
<p>"Because our company has information which has been classified by the <p>"Because our company has information which has been classified by the
national government as secret, our security doesn't stop by putting a fence national government as secret, our security doesn't stop by putting a fence
around our company. Information security is a hot issue. We also make use around our company. Information security is a hot issue. We also make
of checkpoint firewalls, but not all of the internet servers are guarded use of checkpoint firewalls, but not all of the internet servers are guarded
by checkpoint, some of them are running....Shorewall." -- Name withheld by checkpoint, some of them are running....Shorewall." -- Name withheld
by request, Europe</p> by request, Europe</p>
<p>"thanx for all your efforts you put into shorewall - this product stands <p>"thanx for all your efforts you put into shorewall - this product stands
out against a lot of commercial stuff i´ve been working with in terms of out against a lot of commercial stuff i´ve been working with in terms
flexibillity, quality &amp; support" -- RM, Austria</p> of flexibillity, quality &amp; support" -- RM, Austria</p>
<p>"I have never seen such a complete firewall package that is so easy to <p>"I have never seen such a complete firewall package that is so easy to
configure. I searched the Debian package system for firewall scripts and configure. I searched the Debian package system for firewall scripts and
Shorewall won hands down." -- RG, Toronto</p> Shorewall won hands down." -- RG, Toronto</p>
<p>"My respects... I've just found and installed Shorewall 1.3.3-1 and it <p>"My respects... I've just found and installed Shorewall 1.3.3-1 and it
is a wonderful piece of software. I've just sent out an email to about 30 is a wonderful piece of software. I've just sent out an email to about
people recommending it. :-)<br> 30 people recommending it. :-)<br>
While I had previously taken the time (maybe 40 hours) to really understand While I had previously taken the time (maybe 40 hours) to really understand
ipchains, then spent at least an hour per server customizing and carefully ipchains, then spent at least an hour per server customizing and carefully
scrutinizing firewall rules, I've got shorewall running on my home firewall, scrutinizing firewall rules, I've got shorewall running on my home firewall,
@ -112,5 +113,6 @@ by request, Europe</p>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
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@ -1,41 +1,51 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html> <html>
<head> <head>
<meta http-equiv="Content-Language" content="en-us">
<meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta http-equiv="Content-Language" content="en-us">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<title>Samba</title>
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type"
content="text/html; charset=windows-1252">
<title>Samba</title>
</head> </head>
<body>
<body> <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#FFFFFF">Samba</font></h1> <h1 align="center"><font color="#ffffff">Samba</font></h1>
</td> </td>
</tr> </tr>
</tbody>
</table> </table>
<p>If you wish to run Samba on your firewall and access shares between the <p>If you wish to run Samba on your firewall and access shares between the
firewall and local hosts, you need the following rules:</p> firewall and local hosts, you need the following rules:</p>
<h4>/etc/shorewall/rules:</h4> <h4>/etc/shorewall/rules:</h4>
<blockquote>
<table border="2" cellpadding="2" style="border-collapse: collapse"> <blockquote> <font face="Century Gothic, Arial, Helvetica"> </font>
<table border="2" cellpadding="2" style="border-collapse: collapse;">
<tbody>
<tr> <tr>
<font face="Century Gothic, Arial, Helvetica">
<td><b>ACTION</b></td> <td><b>ACTION</b></td>
<td><b>SOURCE</b></td> <td><b>SOURCE</b></td>
<td><b>DEST</b></td> <td><b>DEST</b></td>
<td><b> <td><b> PROTO</b></td>
PROTO</b></td>
<td><b>DEST<br> <td><b>DEST<br>
PORT(S)</b></td> PORT(S)</b></td>
<td><b>SOURCE<br> <td><b>SOURCE<br>
PORT(S)</b></td> PORT(S)</b></td>
<td><b>ORIGINAL<br> <td><b>ORIGINAL<br>
DEST</b></td> DEST</b></td>
</font>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -43,8 +53,8 @@ firewall and local hosts, you need the following rules:</p>
<td>loc</td> <td>loc</td>
<td>udp</td> <td>udp</td>
<td>137:139</td> <td>137:139</td>
<td>&nbsp;</td> <td> </td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -52,8 +62,8 @@ firewall and local hosts, you need the following rules:</p>
<td>loc</td> <td>loc</td>
<td>tcp</td> <td>tcp</td>
<td>137,139</td> <td>137,139</td>
<td>&nbsp;</td> <td> </td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -62,7 +72,7 @@ firewall and local hosts, you need the following rules:</p>
<td>udp</td> <td>udp</td>
<td>1024:</td> <td>1024:</td>
<td>137</td> <td>137</td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -70,8 +80,8 @@ firewall and local hosts, you need the following rules:</p>
<td>fw</td> <td>fw</td>
<td>udp</td> <td>udp</td>
<td>137:139</td> <td>137:139</td>
<td>&nbsp;</td> <td> </td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -79,8 +89,8 @@ firewall and local hosts, you need the following rules:</p>
<td>fw</td> <td>fw</td>
<td>tcp</td> <td>tcp</td>
<td>137,139</td> <td>137,139</td>
<td>&nbsp;</td> <td> </td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
<tr> <tr>
<td>ACCEPT</td> <td>ACCEPT</td>
@ -89,10 +99,16 @@ firewall and local hosts, you need the following rules:</p>
<td>udp</td> <td>udp</td>
<td>1024:</td> <td>1024:</td>
<td>137</td> <td>137</td>
<td>&nbsp;</td> <td> </td>
</tr> </tr>
</table>
</blockquote> </tbody>
<p><font size="2">Last modified 5/29/2002 - <a href="support.htm">Tom </table>
Eastep</a></font><p><font face="Trebuchet MS"><a href="copyright.htm"> </blockquote>
<font size="2">Copyright</font> © <font size="2">2002 Thomas M. Eastep.</font></a></font></body></html>
<p><font size="2">Last modified 5/29/2002 - <a href="support.htm">Tom Eastep</a></font></p>
<p><font face="Trebuchet MS"><a href="copyright.htm"> <font size="2">Copyright</font>
© <font size="2">2002 Thomas M. Eastep.</font></a></font></p>
<br>
</body>
</html>

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@ -9,37 +9,46 @@
<title>Shoreline Firewall (Shorewall) 1.4</title> <title>Shoreline Firewall (Shorewall) 1.4</title>
<base target="_self"> <base
target="_self">
</head> </head>
<body> <body>
<table border="0" cellpadding="0" cellspacing="4" <table cellpadding="0" cellspacing="4"
style="border-collapse: collapse;" width="100%" id="AutoNumber3" style="border-collapse: collapse;" width="100%" id="AutoNumber3"
bgcolor="#4b017c"> bgcolor="#3366ff">
<tbody> <tbody>
<tr> <tr>
<td width="33%" height="90" valign="middle" <td width="33%" height="90"
align="left"><a href="http://www.cityofshoreline.com"><img valign="middle" align="left"><a href="http://www.cityofshoreline.com"><img
src="images/washington.jpg" alt="" width="97" height="80" hspace="4" src="images/washington.jpg" alt="" width="97" height="80" hspace="4"
border="0"> border="0">
</a></td> </a></td>
<td valign="middle" width="34%" align="center"> <td valign="middle" width="34%" align="center"
bgcolor="#ffffff">
<h1><font color="#ffffff">Shorewall 1.4</font><i><font <div align="center">
color="#ffffff"> <small><small><small>"iptables made easy"</small></small></small></font></i></h1>
<img
src="images/Logo1.png" alt="(Shorewall Logo)" width="341" height="80">
</div>
</td> </td>
<td valign="middle"> <td valign="middle" width="33%">
<h1 align="center"><a href="http://www.shorewall.net" <h1 align="center"><a href="http://www.shorewall.net"
target="_top"><img border="0" src="images/shorewall.jpg" width="119" target="_top"><img border="0" src="images/shorewall.jpg" width="119"
height="38" hspace="4" alt="(Shorewall Logo)" align="right" vspace="4"> height="38" hspace="4" alt="(Shorewall Logo)" align="right" vspace="4">
</a></h1> </a></h1>
<br> <br>
</td> </td>
@ -52,7 +61,11 @@
<div align="center"> <div align="center">
<div align="center"> </div>
<center> <center>
<div align="center"> </div>
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4"> style="border-collapse: collapse;" width="100%" id="AutoNumber4">
@ -61,9 +74,12 @@
<tr> <tr>
<td width="90%"> <td width="90%">
<div align="center">
<br>
</div>
<h2 align="left">What is it?</h2> <h2 align="left">What is it?</h2>
@ -71,6 +87,7 @@
<p>The Shoreline Firewall, more commonly known as "Shorewall", is a <p>The Shoreline Firewall, more commonly known as "Shorewall", is a
<a href="http://www.netfilter.org">Netfilter</a> (iptables) based firewall <a href="http://www.netfilter.org">Netfilter</a> (iptables) based firewall
that can be used on a dedicated firewall system, a multi-function that can be used on a dedicated firewall system, a multi-function
@ -80,6 +97,7 @@
<p>This program is free software; you can redistribute it and/or modify <p>This program is free software; you can redistribute it and/or modify
it under the terms of <a it under the terms of <a
@ -89,10 +107,10 @@ General Public License</a> as published by the Free Software
<br> <br>
This program is distributed in This program is distributed
the hope that it will be useful, but in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.<br> GNU General Public License for more details.<br>
@ -102,7 +120,8 @@ the implied warranty of MERCHANTABILITY
of the GNU General Public License of the GNU General Public License
along with this program; if not, write along with this program; if not, write
to the Free Software Foundation, to the Free Software Foundation,
Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p> Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p>
@ -118,19 +137,33 @@ Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p>
<h2>This is the Shorewall 1.4 Web Site</h2>
The information on this site applies only to 1.4.x releases of Shorewall.
For older versions:<br>
<ul>
<li>The 1.3 site is <a href="http://www.shorewall.net/1.3"
target="_top">here.</a></li>
<li>The 1.2 site is <a href="http://shorewall.net/1.2/"
target="_top">here</a>.<br>
</li>
</ul>
<h2>Getting Started with Shorewall</h2> <h2>Getting Started with Shorewall</h2>
New to Shorewall? Start by selecting the New to Shorewall? Start by selecting
<a href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that the <a href="shorewall_quickstart_guide.htm">QuickStart Guide</a>
most closely match your environment and follow the step by that most closely match your environment and follow the step
step instructions.<br> by step instructions.<br>
<h2>Looking for Information?</h2> <h2>Looking for Information?</h2>
The <a href="shorewall_quickstart_guide.htm#Documentation">Documentation The <a href="shorewall_quickstart_guide.htm#Documentation">Documentation
Index</a> is a good place to start as is the Quick Search to your right. Index</a> is a good place to start as is the Quick Search to your right.
<h2>Running Shorewall on Mandrake with a two-interface setup?</h2> <h2>Running Shorewall on Mandrake with a two-interface setup?</h2>
If so, the documentation<b> </b>on this site will not If so, the documentation<b> </b>on this site will
apply directly to your setup. If you want to use the documentation not apply directly to your setup. If you want to use the documentation
that you find here, you will want to consider uninstalling what you have that you find here, you will want to consider uninstalling what you have
and installing a setup that matches the documentation on this site. and installing a setup that matches the documentation on this site.
See the <a href="two-interface.htm">Two-interface QuickStart Guide</a> See the <a href="two-interface.htm">Two-interface QuickStart Guide</a>
@ -142,44 +175,56 @@ most closely match your environment and follow the step by
<p><b></b></p>
<ol> <ol>
</ol> </ol>
<p><b>7/15/2003 - New Mirror in Brazil</b><b> <img border="0"
src="images/new10.gif" width="28" height="12" alt="(New)">
<br>
</b></p>
Thanks to the folks at securityopensource.org.br, there is now a <a
href="http://shorewall.securityopensource.org.br" target="_top">Shorewall
mirror in Brazil</a>.<br>
<p><b>7/15/2003 - Shorewall-1.4.6 RC 1</b><b> <img border="0" <p><b>7/15/2003 - Shorewall-1.4.6 RC 1</b><b> <img border="0"
src="images/new10.gif" width="28" height="12" alt="(New)"> src="images/new10.gif" width="28" height="12" alt="(New)">
<br>
</b></p> </b></p>
<blockquote>
<p><b><a href="http://shorewall.net/pub/shorewall/testing">http://shorewall.net/pub/shorewall/testing</a><br> <blockquote><b><a
<a href="ftp://shorewall.net/pub/shorewall/testing" href="http://shorewall.net/pub/shorewall/testing">http://shorewall.net/pub/shorewall/testing</a></b><b><a
target="_top">ftp://shorewall.net/pub/shorewall/testing</a><br> href="ftp://shorewall.net/pub/shorewall/testing" target="_top"><br>
</b></p> ftp://shorewall.net/pub/shorewall/testing</a><br>
</blockquote> </b></blockquote>
<blockquote> </blockquote>
<p><b>Problems Corrected:</b><br> <p><b>Problems Corrected:</b><br>
</p> </p>
<ol> <ol>
<li>A problem seen on RH7.3 systems where Shorewall encountered <li>A problem seen on RH7.3 systems where Shorewall encountered
start errors when started using the "service" mechanism has been worked start errors when started using the "service" mechanism has been worked
around.<br> around.<br>
<br> <br>
</li> </li>
<li>Where a list of IP addresses appears in the DEST column of a <li>Where a list of IP addresses appears in the DEST column
DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in the nat of a DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in
table (one for each element in the list). Shorewall now correctly creates the nat table (one for each element in the list). Shorewall now correctly
a single DNAT rule with multiple "--to-destination" clauses.<br> creates a single DNAT rule with multiple "--to-destination" clauses.<br>
<br> <br>
</li> </li>
<li>Corrected a problem in Beta 1 where DNS names containing a "-" <li>Corrected a problem in Beta 1 where DNS names containing
were mis-handled when they appeared in the DEST column of a rule.<br> a "-" were mis-handled when they appeared in the DEST column of a rule.<br>
<br> <br>
</li> </li>
<li>A number of problems with rule parsing have been corrected. Corrections <li>A number of problems with rule parsing have been corrected.
involve the handling of "z1!z2" in the SOURCE column as well as lists in Corrections involve the handling of "z1!z2" in the SOURCE column as well
the ORIGINAL DESTINATION column.<br> as lists in the ORIGINAL DESTINATION column.<br>
</li> </li>
</ol> </ol>
@ -189,19 +234,19 @@ the ORIGINAL DESTINATION column.<br>
<ol> <ol>
<li>In earlier versions, an undocumented feature allowed entries <li>In earlier versions, an undocumented feature allowed entries
in the host file as follows:<br> in the host file as follows:<br>
<br> <br>
    z    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br>     z    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br>
<br> <br>
This capability was never documented and has been removed in 1.4.6 to allow This capability was never documented and has been removed in 1.4.6
entries of the following format:<br> to allow entries of the following format:<br>
<br> <br>
    z   eth1:192.168.1.0/24,192.168.2.0/24<br>     z   eth1:192.168.1.0/24,192.168.2.0/24<br>
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have been <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have
removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically been removed from /etc/shorewall/shorewall.conf. These capabilities are
detected by Shorewall (see below).<br> now automatically detected by Shorewall (see below).<br>
</li> </li>
</ol> </ol>
@ -210,22 +255,22 @@ removed from /etc/shorewall/shorewall.conf. These capabilities are now automatic
</p> </p>
<ol> <ol>
<li>A 'newnotsyn' interface option has been added. This option may <li>A 'newnotsyn' interface option has been added. This option
be specified in /etc/shorewall/interfaces and overrides the setting NEWNOTSYN=No may be specified in /etc/shorewall/interfaces and overrides the setting
for packets arriving on the associated interface.<br> NEWNOTSYN=No for packets arriving on the associated interface.<br>
<br> <br>
</li> </li>
<li>The means for specifying a range of IP addresses in /etc/shorewall/masq <li>The means for specifying a range of IP addresses in /etc/shorewall/masq
to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for address to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for
ranges.<br> address ranges.<br>
<br> <br>
</li> </li>
<li>Shorewall can now add IP addresses to subnets other than the <li>Shorewall can now add IP addresses to subnets other than
first one on an interface.<br> the first one on an interface.<br>
<br> <br>
</li> </li>
<li>DNAT[-] rules may now be used to load balance (round-robin) <li>DNAT[-] rules may now be used to load balance (round-robin)
over a set of servers. Servers may be specified in a range of addresses over a set of servers. Servers may be specified in a range of addresses
given as &lt;first address&gt;-&lt;last address&gt;.<br> given as &lt;first address&gt;-&lt;last address&gt;.<br>
<br> <br>
Example:<br> Example:<br>
@ -234,9 +279,10 @@ over a set of servers. Servers may be specified in a range of addresses
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration
options have been removed and have been replaced by code that detects whether options have been removed and have been replaced by code that detects
these capabilities are present in the current kernel. The output of the whether these capabilities are present in the current kernel. The output
start, restart and check commands have been enhanced to report the outcome:<br> of the start, restart and check commands have been enhanced to report the
outcome:<br>
<br> <br>
Shorewall has detected the following iptables/netfilter capabilities:<br> Shorewall has detected the following iptables/netfilter capabilities:<br>
   NAT: Available<br>    NAT: Available<br>
@ -245,12 +291,12 @@ start, restart and check commands have been enhanced to report the outcome:<br>
Verifying Configuration...<br> Verifying Configuration...<br>
<br> <br>
</li> </li>
<li>Support for the Connection Tracking Match Extension has been <li>Support for the Connection Tracking Match Extension has
added. This extension is available in recent kernel/iptables releases and been added. This extension is available in recent kernel/iptables releases
allows for rules which match against elements in netfilter's connection tracking and allows for rules which match against elements in netfilter's connection
table. Shorewall automatically detects the availability of this extension tracking table. Shorewall automatically detects the availability of this
and reports its availability in the output of the start, restart and check extension and reports its availability in the output of the start, restart
commands.<br> and check commands.<br>
<br> <br>
Shorewall has detected the following iptables/netfilter capabilities:<br> Shorewall has detected the following iptables/netfilter capabilities:<br>
   NAT: Available<br>    NAT: Available<br>
@ -259,18 +305,18 @@ allows for rules which match against elements in netfilter's connection trackin
   Connection Tracking Match: Available<br>    Connection Tracking Match: Available<br>
Verifying Configuration...<br> Verifying Configuration...<br>
<br> <br>
If this extension is available, the ruleset generated by Shorewall is If this extension is available, the ruleset generated by Shorewall
changed in the following ways:</li> is changed in the following ways:</li>
<ul> <ul>
<li>To handle 'norfc1918' filtering, Shorewall will not create <li>To handle 'norfc1918' filtering, Shorewall will not create
chains in the mangle table but will rather do all 'norfc1918' filtering in chains in the mangle table but will rather do all 'norfc1918' filtering
the filter table (rfc1918 chain).</li> in the filter table (rfc1918 chain).</li>
<li>Recall that Shorewall DNAT rules generate two netfilter rules; <li>Recall that Shorewall DNAT rules generate two netfilter
one in the nat table and one in the filter table. If the Connection Tracking rules; one in the nat table and one in the filter table. If the Connection
Match Extension is available, the rule in the filter table is extended to Tracking Match Extension is available, the rule in the filter table is
check that the original destination address was the same as specified (or extended to check that the original destination address was the same as
defaulted to) in the DNAT rule.<br> specified (or defaulted to) in the DNAT rule.<br>
<br> <br>
</li> </li>
@ -282,7 +328,7 @@ defaulted to) in the DNAT rule.<br>
<li>An 'ipcalc' command has been added to /sbin/shorewall.<br> <li>An 'ipcalc' command has been added to /sbin/shorewall.<br>
<br> <br>
      ipcalc [ &lt;address&gt; &lt;netmask&gt; | &lt;address&gt;/&lt;vlsm&gt;       ipcalc [ &lt;address&gt; &lt;netmask&gt; | &lt;address&gt;/&lt;vlsm&gt;
]<br> ]<br>
<br> <br>
Examples:<br> Examples:<br>
<br> <br>
@ -302,22 +348,23 @@ defaulted to) in the DNAT rule.<br>
<br> <br>
Warning:<br> Warning:<br>
<br> <br>
If your shell only supports 32-bit signed arithmatic (ash or dash), then If your shell only supports 32-bit signed arithmatic (ash or dash),
the ipcalc command produces incorrect information for IP addresses 128.0.0.0-1 then the ipcalc command produces incorrect information for IP addresses
and for /1 networks. Bash should produce correct information for all valid 128.0.0.0-1 and for /1 networks. Bash should produce correct information
IP addresses.<br> for all valid IP addresses.<br>
<br> <br>
</li> </li>
<li>An 'iprange' command has been added to /sbin/shorewall. <br> <li>An 'iprange' command has been added to /sbin/shorewall.
<br>
<br> <br>
      iprange &lt;address&gt;-&lt;address&gt;<br>       iprange &lt;address&gt;-&lt;address&gt;<br>
<br> <br>
This command decomposes a range of IP addressses into a list of network This command decomposes a range of IP addressses into a list of network
and host addresses. The command can be useful if you need to construct an and host addresses. The command can be useful if you need to construct an
efficient set of rules that accept connections from a range of network addresses.<br> efficient set of rules that accept connections from a range of network addresses.<br>
<br> <br>
Note: If your shell only supports 32-bit signed arithmetic (ash or dash) Note: If your shell only supports 32-bit signed arithmetic (ash or
then the range may not span 128.0.0.0.<br> dash) then the range may not span 128.0.0.0.<br>
<br> <br>
Example:<br> Example:<br>
<br> <br>
@ -336,7 +383,8 @@ then the range may not span 128.0.0.0.<br>
      [root@gateway root]#<br>       [root@gateway root]#<br>
<br> <br>
</li> </li>
<li>A list of host/net addresses is now allowed in an entry in /etc/shorewall/hosts.<br> <li>A list of host/net addresses is now allowed in an entry
in /etc/shorewall/hosts.<br>
<br> <br>
Example:<br> Example:<br>
<br> <br>
@ -347,40 +395,49 @@ then the range may not span 128.0.0.0.<br>
<p><b>6/17/2003 - Shorewall-1.4.5</b><b> </b></p> <p><b>6/17/2003 - Shorewall-1.4.5</b><b> </b></p>
<p>Problems Corrected:<br> <p>Problems Corrected:<br>
</p> </p>
<ol> <ol>
<li>The command "shorewall debug try &lt;directory&gt;" now <li>The command "shorewall debug try &lt;directory&gt;"
correctly traces the attempt.</li> now correctly traces the attempt.</li>
<li>The INCLUDE directive now works properly in the zones <li>The INCLUDE directive now works properly in the zones
file; previously, INCLUDE in that file was ignored.</li> file; previously, INCLUDE in that file was ignored.</li>
<li>/etc/shorewall/routestopped records with an empty second <li>/etc/shorewall/routestopped records with an empty
column are no longer ignored.<br> second column are no longer ignored.<br>
</li> </li>
</ol> </ol>
<p>New Features:<br> <p>New Features:<br>
</p> </p>
<ol> <ol>
<li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-] <li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-]
rule may now contain a list of addresses. If the list begins with "!' rule may now contain a list of addresses. If the list begins with "!'
then the rule will take effect only if the original destination address then the rule will take effect only if the original destination address
in the connection request does not match any of the addresses listed.</li> in the connection request does not match any of the addresses listed.</li>
</ol> </ol>
<p><b>6/15/2003 - Shorewall, Kernel 2.4.21 and iptables 1.2.8</b><b> <p><b>6/15/2003 - Shorewall, Kernel 2.4.21 and iptables 1.2.8</b><b>
</b></p> </b></p>
<p>The firewall at shorewall.net has been upgraded to the 2.4.21 kernel <p>The firewall at shorewall.net has been upgraded to the 2.4.21 kernel
and iptables 1.2.8 (using the "official" RPM from netfilter.org). No problems and iptables 1.2.8 (using the "official" RPM from netfilter.org). No
have been encountered with this set of software. The Shorewall version problems have been encountered with this set of software. The Shorewall
is 1.4.4b plus the accumulated changes for 1.4.5.<br> version is 1.4.4b plus the accumulated changes for 1.4.5.<br>
</p> </p>
<p><b>6/8/2003 - Updated Samples</b><b> </b></p> <p><b>6/8/2003 - Updated Samples</b><b> </b></p>
@ -390,6 +447,7 @@ in the connection request does not match any of the addresses listed.</li>
<p><b></b></p> <p><b></b></p>
<ol> <ol>
@ -408,26 +466,26 @@ in the connection request does not match any of the addresses listed.</li>
border="0" src="images/leaflogo.gif" width="49" height="36" border="0" src="images/leaflogo.gif" width="49" height="36"
alt="(Leaf Logo)"> alt="(Leaf Logo)">
</a>Jacques Nilo and Eric Wolzak </a>Jacques Nilo and Eric
have a LEAF (router/firewall/gateway Wolzak have a LEAF (router/firewall/gateway
on a floppy, CD or compact flash) distribution on a floppy, CD or compact flash) distribution
called <i>Bering</i> that features called <i>Bering</i> that
Shorewall-1.4.2 and Kernel-2.4.20. You features Shorewall-1.4.2 and Kernel-2.4.20.
can find their work at: <a You can find their work at:
href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo<br> <a href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo<br>
</a></p> </a></p>
<b>Congratulations to Jacques and Eric on the <b>Congratulations to Jacques and Eric on
recent release of Bering 1.2!!! </b><br> the recent release of Bering 1.2!!! </b><br>
<h2><a name="Donations"></a>Donations</h2> <h2><a name="Donations"></a>Donations</h2>
</td> </td>
<td width="88" bgcolor="#4b017c" <td width="88" bgcolor="#3366ff"
valign="top" align="center"> valign="top" align="center">
@ -443,17 +501,19 @@ recent release of Bering 1.2!!! </b><br>
<p><font color="#ffffff"><strong>Quick Search</strong></font><br> <p><font color="#ffffff"><strong>Quick Search</strong></font><br>
<font
face="Arial" size="-1"> <input type="text" name="words" <font face="Arial" size="-1"> <input type="text"
size="15"></font><font size="-1"> </font> <font face="Arial" name="words" size="15"></font><font size="-1"> </font> <font
size="-1"> <input type="hidden" name="format" value="long"> <input face="Arial" size="-1"> <input type="hidden" name="format"
type="hidden" name="method" value="and"> <input type="hidden" value="long"> <input type="hidden" name="method" value="and"> <input
name="config" value="htdig"> <input type="submit" value="Search"></font> type="hidden" name="config" value="htdig"> <input type="submit"
</p> value="Search"></font> </p>
<font
face="Arial"> <input type="hidden" name="exclude" <font face="Arial"> <input type="hidden"
value="[http://lists.shorewall.net/pipermail/*]"> </font> </form> name="exclude" value="[http://lists.shorewall.net/pipermail/*]"> </font>
</form>
@ -478,7 +538,7 @@ recent release of Bering 1.2!!! </b><br>
<table border="0" cellpadding="5" cellspacing="0" <table border="0" cellpadding="5" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber2" style="border-collapse: collapse;" width="100%" id="AutoNumber2"
bgcolor="#4b017c"> bgcolor="#3366ff">
<tbody> <tbody>
@ -500,9 +560,10 @@ recent release of Bering 1.2!!! </b><br>
<p align="center"><font size="4" color="#ffffff"><br> <p align="center"><font size="4" color="#ffffff"><br>
<font size="+2"> Shorewall is free but if you try <font size="+2"> Shorewall is free but if you
it and find it useful, please consider making a donation try it and find it useful, please consider making a donation
to to
<a href="http://www.starlight.org"><font color="#ffffff">Starlight <a href="http://www.starlight.org"><font color="#ffffff">Starlight
Children's Foundation.</font></a> Thanks!</font></font></p> Children's Foundation.</font></a> Thanks!</font></font></p>
@ -517,9 +578,8 @@ it and find it useful, please consider making a donation
</table> </table>
<p><font size="2">Updated 7/15/2003 - <a href="support.htm">Tom Eastep</a></font> <p><font size="2">Updated 7/16/2003 - <a href="support.htm">Tom Eastep</a></font>
<br>
</p>
<br> <br>
</p>
</body> </body>
</html> </html>

29
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@ -17,7 +17,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -46,8 +46,8 @@
href="http://www.washington.edu">University of Washington</a> 1969</li> href="http://www.washington.edu">University of Washington</a> 1969</li>
<li>Burroughs Corporation (now <a <li>Burroughs Corporation (now <a
href="http://www.unisys.com">Unisys</a> ) 1969 - 1980</li> href="http://www.unisys.com">Unisys</a> ) 1969 - 1980</li>
<li><a href="http://www.tandem.com">Tandem Computers, <li><a href="http://www.tandem.com">Tandem
Incorporated</a> (now part of the <a Computers, Incorporated</a> (now part of the <a
href="http://www.hp.com">The New HP</a>) 1980 - present</li> href="http://www.hp.com">The New HP</a>) 1980 - present</li>
<li>Married 1969 - no children.</li> <li>Married 1969 - no children.</li>
@ -58,21 +58,21 @@
<p>I became interested in Internet Security when I established a home office <p>I became interested in Internet Security when I established a home office
in 1999 and had DSL service installed in our home. I investigated in 1999 and had DSL service installed in our home. I investigated
ipchains and developed the scripts which are now collectively known ipchains and developed the scripts which are now collectively
as <a href="http://seawall.sourceforge.net"> Seattle Firewall</a>. known as <a href="http://seawall.sourceforge.net"> Seattle Firewall</a>.
Expanding on what I learned from Seattle Firewall, I then Expanding on what I learned from Seattle Firewall, I then
designed and wrote Shorewall. </p> designed and wrote Shorewall. </p>
<p>I telework from our <a <p>I telework from our <a
href="http://lists.shorewall.net/SeattleInTheSpring.html">home</a> in <a href="http://lists.shorewall.net/SeattleInTheSpring.html">home</a> in <a
href="http://www.cityofshoreline.com">Shoreline, Washington</a> href="http://www.cityofshoreline.com">Shoreline, Washington</a> where
where I live with my wife Tarry.  </p> I live with my wife Tarry.  </p>
<p>Our current home network consists of: </p> <p>Our current home network consists of: </p>
<ul> <ul>
<li>1.2Gz Athlon, Windows XP Pro, 320MB RAM, <li>1.2Gz Athlon, Windows XP Pro, 320MB RAM,
40GB &amp; 20GB IDE HDs and LNE100TX (Tulip) NIC - My personal 40GB &amp; 20GB IDE HDs and LNE100TX (Tulip) NIC - My personal
Windows system. Serves as a PPTP server for Road Warrior access. Dual Windows system. Serves as a PPTP server for Road Warrior access. Dual
boots <a href="http://www.mandrakelinux.com">Mandrake</a> 9.0.</li> boots <a href="http://www.mandrakelinux.com">Mandrake</a> 9.0.</li>
<li>Celeron 1.4Gz, RH8.0, 384MB RAM, 60GB HD, <li>Celeron 1.4Gz, RH8.0, 384MB RAM, 60GB HD,
@ -83,16 +83,16 @@ Samba. This system also has <a href="http://www.vmware.com/">VMware</a>
machines.</li> machines.</li>
<li>K6-2/350, RH8.0, 384MB RAM, 8GB IDE HD, <li>K6-2/350, RH8.0, 384MB RAM, 8GB IDE HD,
EEPRO100 NIC  - Email (Postfix, Courier-IMAP and Mailman), HTTP (Apache), EEPRO100 NIC  - Email (Postfix, Courier-IMAP and Mailman), HTTP (Apache),
FTP (Pure_ftpd), DNS server (Bind 9).</li> FTP (Pure_ftpd), DNS server (Bind 9).</li>
<li>PII/233, RH8.0, 256MB MB RAM, 2GB SCSI <li>PII/233, RH8.0, 256MB MB RAM, 2GB SCSI
HD - 3 LNE100TX  (Tulip) and 1 TLAN NICs  - Firewall running Shorewall HD - 3 LNE100TX  (Tulip) and 1 TLAN NICs  - Firewall running Shorewall
1.4.6Beta1, a DHCP server and Samba configured as a WINS server..</li> 1.4.6Beta1, a DHCP server and Samba configured as a WINS server..</li>
<li>Duron 750, Win ME, 192MB RAM, 20GB HD, RTL8139 <li>Duron 750, Win ME, 192MB RAM, 20GB HD,
NIC - My wife's personal system.</li> RTL8139 NIC - My wife's personal system.</li>
<li>PII/400 Laptop, WinXP SP1, 224MB RAM, 12GB <li>PII/400 Laptop, WinXP SP1, 224MB RAM, 12GB
HD, built-in EEPRO100, EEPRO100 in expansion base - My work system.</li> HD, built-in EEPRO100, EEPRO100 in expansion base - My work system.</li>
<li>XP 2200 Laptop, WinXP SP1, 512MB RAM, 40GB HD, built-in NIC and <li>XP 2200 Laptop, WinXP SP1, 512MB RAM, 40GB HD, built-in NIC
LinkSys WET11 - Our Laptop.<br> and LinkSys WET11 - Our Laptop.<br>
</li> </li>
</ul> </ul>
@ -133,5 +133,6 @@ HD - 3 LNE100TX
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

46
Shorewall-docs/shorewall_extension_scripts.htm
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -31,19 +31,22 @@
points during firewall start, restart, stop and clear. The scripts are points during firewall start, restart, stop and clear. The scripts are
placed in /etc/shorewall and are processed using the Bourne shell "source" placed in /etc/shorewall and are processed using the Bourne shell "source"
mechanism.<br> mechanism.<br>
</p> </p>
<p><font color="#ff0000"><b>Caution: <br> <p><font color="#ff0000"><b>Caution: <br>
</b></font></p> </b></font></p>
<ol> <ol>
<li><font color="#ff0000"><b>Be sure that you actually need to use an extension <li><font color="#ff0000"><b>Be sure that you actually need to use an
script to do what you want. Shorewall has a wide range of features that cover extension script to do what you want. Shorewall has a wide range of features
most requirements.</b></font></li> that cover most requirements.</b></font></li>
<li><font color="#ff0000"><b>DO NOT SIMPLY COPY RULES THAT YOU FIND ON <li><font color="#ff0000"><b>DO NOT SIMPLY COPY RULES THAT YOU FIND ON
THE NET INTO AN EXTENSION SCRIPT AND EXPECT THEM TO WORK AND TO NOT BREAK THE NET INTO AN EXTENSION SCRIPT AND EXPECT THEM TO WORK AND TO NOT BREAK
SHOREWALL. TO USE SHOREWALL EXTENSION SCRIPTS YOU MUST KNOW WHAT YOU ARE DOING SHOREWALL. TO USE SHOREWALL EXTENSION SCRIPTS YOU MUST KNOW WHAT YOU ARE
WITH RESPECT TO iptables/Netfilter</b></font></li> DOING WITH RESPECT TO iptables/Netfilter</b></font></li>
</ol> </ol>
<p>The following scripts can be supplied:</p> <p>The following scripts can be supplied:</p>
<ul> <ul>
@ -53,8 +56,8 @@ WITH RESPECT TO iptables/Netfilter</b></font></li>
<li>stop -- invoked as a first step when the firewall is being stopped.</li> <li>stop -- invoked as a first step when the firewall is being stopped.</li>
<li>stopped -- invoked after the firewall has been stopped.</li> <li>stopped -- invoked after the firewall has been stopped.</li>
<li>clear -- invoked after the firewall has been cleared.</li> <li>clear -- invoked after the firewall has been cleared.</li>
<li>refresh -- invoked while the firewall is being refreshed but before <li>refresh -- invoked while the firewall is being refreshed but
the common and/or blacklst chains have been rebuilt.</li> before the common and/or blacklst chains have been rebuilt.</li>
<li>newnotsyn (added in version 1.3.6) -- invoked after the 'newnotsyn' <li>newnotsyn (added in version 1.3.6) -- invoked after the 'newnotsyn'
chain has been created but before any rules have been added to it.</li> chain has been created but before any rules have been added to it.</li>
@ -70,18 +73,18 @@ WITH RESPECT TO iptables/Netfilter</b></font></li>
<p>The /etc/shorewall/common file receives special treatment. If this file <p>The /etc/shorewall/common file receives special treatment. If this file
is present, the rules that it defines will totally replace the default is present, the rules that it defines will totally replace the default
rules in the common chain. These default rules are contained in rules in the common chain. These default rules are contained in the
the file /etc/shorewall/common.def which may be used as a starting file /etc/shorewall/common.def which may be used as a starting point
point for making your own customized file.</p> for making your own customized file.</p>
<p> Rather than running iptables directly, you should run it using the <p> Rather than running iptables directly, you should run it using the
function run_iptables. Similarly, rather than running "ip" directly, you function run_iptables. Similarly, rather than running "ip" directly, you
should use run_ip. These functions accept the same arguments as the underlying should use run_ip. These functions accept the same arguments as the underlying
command but cause the firewall to be stopped if an error occurs during processing command but cause the firewall to be stopped if an error occurs during
of the command.</p> processing of the command.</p>
<p> If you decide to create /etc/shorewall/common it is a good idea to use <p> If you decide to create /etc/shorewall/common it is a good idea to
the following technique</p> use the following technique</p>
<p> /etc/shorewall/common:</p> <p> /etc/shorewall/common:</p>
@ -90,9 +93,9 @@ the following technique</p>
</blockquote> </blockquote>
<p>If you need to supercede a rule in the released common.def file, you can <p>If you need to supercede a rule in the released common.def file, you can
add the superceding rule before the '.' command. Using this technique add the superceding rule before the '.' command. Using this technique allows
allows you to add new rules while still getting the benefit of the latest you to add new rules while still getting the benefit of the latest common.def
common.def file.</p> file.</p>
<p>Remember that /etc/shorewall/common defines rules that are only applied <p>Remember that /etc/shorewall/common defines rules that are only applied
if the applicable policy is DROP or REJECT. These rules are NOT applied if the applicable policy is DROP or REJECT. These rules are NOT applied
@ -110,5 +113,6 @@ common.def file.</p>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

11
Shorewall-docs/shorewall_features.htm
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -63,14 +63,14 @@ use all types in the same firewall):
</ul> </ul>
</li> </li>
<li><a href="blacklisting_support.htm"><b>Blacklisting</b></a> of individual <li><a href="blacklisting_support.htm"><b>Blacklisting</b></a> of
IP addresses and subnetworks is supported.</li> individual IP addresses and subnetworks is supported.</li>
<li><b><a href="starting_and_stopping_shorewall.htm">Operational support</a></b>: <li><b><a href="starting_and_stopping_shorewall.htm">Operational support</a></b>:
<ul> <ul>
<li>Commands to start, stop and clear the firewall</li> <li>Commands to start, stop and clear the firewall</li>
<li>Supports status monitoring with an audible alarm <li>Supports status monitoring with an audible
when an "interesting" packet is detected.</li> alarm when an "interesting" packet is detected.</li>
<li>Wide variety of informational commands.</li> <li>Wide variety of informational commands.</li>
</ul> </ul>
@ -114,5 +114,6 @@ Address <b>Verification</b><br>
</p> </p>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

167
Shorewall-docs/shorewall_firewall_structure.htm
View File

@ -16,11 +16,12 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Firewall Structure</font></h1> <h1 align="center"><font color="#ffffff">Firewall Structure (Under
Construction)</font></h1>
</td> </td>
</tr> </tr>
@ -28,25 +29,25 @@
</table> </table>
<p> Shorewall views the network in which it is running as a set of <p> Shorewall views the network in which it is running as a set of
<i> zones. </i>Shorewall itself defines exactly one zone called "fw" which <i> zones. </i>Shorewall itself defines exactly one zone called "fw" which
refers to the firewall system itself . The /etc/shorewall/zones file is refers to the firewall system itself . The /etc/shorewall/zones file
used to define additional zones and the example file provided with Shorewall is used to define additional zones and the example file provided with
defines the zones:</p> Shorewall defines the zones:</p>
<ol> <ol>
<li> net -- the (untrusted) internet.</li> <li> net -- the (untrusted) internet.</li>
<li> dmz - systems that must be accessible from the internet <li> dmz - systems that must be accessible from the internet
and from the local network.  These systems cannot be trusted completely since and from the local network.  These systems cannot be trusted completely
their servers may have been compromised through a security exploit.</li> since their servers may have been compromised through a security exploit.</li>
<li> loc - systems in your local network(s). These systems <li> loc - systems in your local network(s). These systems
must be protected from the internet and from the DMZ and in some cases, must be protected from the internet and from the DMZ and in some
from each other.</li> cases, from each other.</li>
</ol> </ol>
<p><b>Note: </b><a href="#Conf">You can specify the name of the firewall zone</a>. <p><b>Note: </b><a href="#Conf">You can specify the name of the firewall
For ease of description in this documentation, it is assumed that the firewall zone</a>. For ease of description in this documentation, it is assumed
zone is named "fw".</p> that the firewall zone is named "fw".</p>
<p>It can't be stressed enough that with the exception of the firewall zone, <p>It can't be stressed enough that with the exception of the firewall zone,
Shorewall itself attaches no meaning to zone names. Zone names are simply Shorewall itself attaches no meaning to zone names. Zone names are simply
@ -55,12 +56,12 @@ zone is named "fw".</p>
<p>While zones are normally disjoint (no two zones have a host in common), <p>While zones are normally disjoint (no two zones have a host in common),
there are cases where nested or overlapping zone definitions are appropriate.</p> there are cases where nested or overlapping zone definitions are appropriate.</p>
<p>Netfilter has the concept of <i>tables</i> and <i>chains. </i>For the <p>Netfilter has the concept of <i>tables</i> and <i>chains. </i>For the purpose
purpose of this document, we will consider Netfilter to have three tables:</p> of this document, we will consider Netfilter to have three tables:</p>
<ol> <ol>
<li>Filter table -- this is the main table for packet filtering and can <li>Filter table -- this is the main table for packet filtering and
be displayed with the command "shorewall show".</li> can be displayed with the command "shorewall show".</li>
<li>Nat table -- used for all forms of Network Address Translation (NAT); <li>Nat table -- used for all forms of Network Address Translation (NAT);
SNAT, DNAT and MASQUERADE.</li> SNAT, DNAT and MASQUERADE.</li>
<li>Mangle table -- used to modify fields in the packet header.<br> <li>Mangle table -- used to modify fields in the packet header.<br>
@ -166,8 +167,8 @@ purpose of this document, we will consider Netfilter to have three tables:</p>
<p><br> <p><br>
<br> <br>
In the text that follows, the paragraph numbers correspond to the box number In the text that follows, the paragraph numbers correspond to the box
in the diagram above.<br> number in the diagram above.<br>
</p> </p>
<ol> <ol>
@ -177,31 +178,32 @@ purpose of this document, we will consider Netfilter to have three tables:</p>
option and if iptables/netfilter doesn't support the connection tracking option and if iptables/netfilter doesn't support the connection tracking
match extension, then the packet is sent down the <b>man1918</b> chain which match extension, then the packet is sent down the <b>man1918</b> chain which
will drop the packet if its destination IP address is reserved (as specified will drop the packet if its destination IP address is reserved (as specified
in the /etc/shorewall/rfc1918 file). Next the packet passes through the<b> in the /etc/shorewall/rfc1918 file). Next the packet passes through the<b>
pretos</b> chain to set its TOS field as specified in the /etc/shorewall/tos pretos</b> chain to set its TOS field as specified in the /etc/shorewall/tos
file. Finally, if traffic control/shaping is being used, the packet is sent file. Finally, if traffic control/shaping is being used, the packet is
through the<b> tcpre</b> chain to be marked for later use in policy routing sent through the<b> tcpre</b> chain to be marked for later use in policy
or traffic control.<br> routing or traffic control.<br>
<br> <br>
Next, if the packet isn't part of an established connection, it passes Next, if the packet isn't part of an established connection, it passes
through the<i> nat</i> table's PREROUTING chain (you can see the nat table through the<i> nat</i> table's PREROUTING chain (you can see the nat table
by typing "shorewall show nat"). If you are doing both static nat and port by typing "shorewall show nat"). If you are doing both static nat and
forwarding, the order in which chains are traversed is dependent on the port forwarding, the order in which chains are traversed is dependent on
setting of NAT_BEFORE_RULES in shorewall.conf. If NAT_BEFORE_RULES is on the setting of NAT_BEFORE_RULES in shorewall.conf. If NAT_BEFORE_RULES is
then packets will ender a chain called<b> <i>interface_</i>in</b> where on then packets will ender a chain called<b> <i>interface_</i>in</b> where
<i>interface</i> is the name of the interface on which the packet entered. <i>interface</i> is the name of the interface on which the packet entered.
Here it's destination IP is compared to each of the <i>EXTERNAL</i> IP addresses Here it's destination IP is compared to each of the <i>EXTERNAL</i> IP
from /etc/shorewall/nat that correspond to this interface; if there is addresses from /etc/shorewall/nat that correspond to this interface; if
a match, DNAT is applied and the packet header is modified to the IP in there is a match, DNAT is applied and the packet header is modified to
the <i>INTERNAL</i> column of the nat file record. If the destination address the IP in the <i>INTERNAL</i> column of the nat file record. If the destination
doesn't match any of the rules in the <b><i>interface_</i>in</b> chain then address doesn't match any of the rules in the <b><i>interface_</i>in</b>
the packet enters a chain called <b><i>sourcezone</i>_dnat</b> where <i>sourcezone</i> chain then the packet enters a chain called <b><i>sourcezone</i>_dnat</b>
is the source zone of the packet. There it is compared for a match against where <i>sourcezone</i> is the source zone of the packet. There it is compared
each of the DNAT records in the rules file that specify <i> sourcezone for a match against each of the DNAT records in the rules file that specify
</i>as the source zone. If a match is found, the destination IP address <i> sourcezone </i>as the source zone. If a match is found, the
(and possibly the destination port) is modified based on the rule matched. destination IP address (and possibly the destination port) is modified based
If NAT_BEFORE_RULES is off, then the order of traversal of the <b><i> interface_</i>in</b> on the rule matched. If NAT_BEFORE_RULES is off, then the order of traversal
and <b><i>sourcezone</i>_dnat</b> is reversed.<br> of the <b><i> interface_</i>in</b> and <b><i>sourcezone</i>_dnat</b> is
reversed.<br>
<br> <br>
</li> </li>
<li>Depending on whether the packet is destined for the firewall itself <li>Depending on whether the packet is destined for the firewall itself
@ -216,30 +218,32 @@ all rules in /etc/shorewall/tcrules that do not specify Prerouting (:P) are
processed in a chain called <br> processed in a chain called <br>
<br> <br>
</li> </li>
<ol> <ol>
</ol> </ol>
<li>Traffic is next sent to an<i> interface </i>chain in the main Netfilter <li>Traffic is next sent to an<i> interface </i>chain in the main Netfilter
table (called 'filter'). If the traffic is destined for the firewall itself, table (called 'filter'). If the traffic is destined for the firewall
the name of the interface chain is formed by appending "_in" to the interface itself, the name of the interface chain is formed by appending "_in" to
name. So traffic on eth0 destined for the firewall will enter a chain called the interface name. So traffic on eth0 destined for the firewall will
<i>eth0_in</i>. The interface chain for traffic that will be routed enter a chain called <i>eth0_in</i>. The interface chain for traffic
to another system is formed by appending "_fwd" to the interface name. that will be routed to another system is formed by appending "_fwd" to
So traffic from eth1 that is going to be forwarded enters a chain called<i> the interface name. So traffic from eth1 that is going to be forwarded
eth1_fwd</i>. Interfaces described with the wild-card character ("+") enters a chain called<i> eth1_fwd</i>. Interfaces described with the wild-card
in /etc/shorewall/interfaces, share input chains. if <i>ppp+ </i>appears character ("+") in /etc/shorewall/interfaces, share input chains. if <i>ppp+
in /etc/shorewall/interfaces then all PPP interfaces (ppp0, ppp1, ...) will </i>appears in /etc/shorewall/interfaces then all PPP interfaces (ppp0,
share the interface chains <i>ppp_in</i> and <i>ppp_fwd</i>. In other words, ppp1, ...) will share the interface chains <i>ppp_in</i> and <i>ppp_fwd</i>.
"+" is deleted from the name before forming the input chain names.<br> In other words, "+" is deleted from the name before forming the input chain
names.<br>
<br> <br>
While the use of interfacechains may seem wasteful in simple environments, While the use of interfacechains may seem wasteful in simple environments,
in complex setups it substantially reduces the number of rules that each in complex setups it substantially reduces the number of rules that each
packet must traverse.  </li> packet must traverse.  </li>
</ol> </ol>
<p> Traffic directed from a zone to the firewall itself is sent through a <p> Traffic directed from a zone to the firewall itself is sent through
chain named &lt;<i>zone name&gt;</i>2fw. For example, traffic inbound from a chain named &lt;<i>zone name&gt;</i>2fw. For example, traffic inbound from
the internet and addressed to the firewall is sent through a chain named the internet and addressed to the firewall is sent through a chain named
net2fw. Similarly, traffic originating in the firewall and being sent net2fw. Similarly, traffic originating in the firewall and being sent
to a host in a given zone is sent through a chain named fw2<i>&lt;zone to a host in a given zone is sent through a chain named fw2<i>&lt;zone
@ -247,8 +251,8 @@ name&gt;. </i>For example, traffic originating in the firewall and
destined for a host in the local network is sent through a chain named destined for a host in the local network is sent through a chain named
<i>fw2loc.</i> <font face="Century Gothic, Arial, Helvetica">  </font></p> <i>fw2loc.</i> <font face="Century Gothic, Arial, Helvetica">  </font></p>
<p> Traffic being forwarded between two zones (or from one interface to a <p> Traffic being forwarded between two zones (or from one interface to
zone to another interface to that zone) is sent through a chain named <i> a zone to another interface to that zone) is sent through a chain named <i>
&lt;source zone&gt;</i>2<i> &lt;destination zone&gt;</i>. So for example, &lt;source zone&gt;</i>2<i> &lt;destination zone&gt;</i>. So for example,
traffic originating in a local system and destined for a remote web server traffic originating in a local system and destined for a remote web server
is sent through chain <i>loc2net. </i>This chain is referred to is sent through chain <i>loc2net. </i>This chain is referred to
@ -262,53 +266,53 @@ be expressed in terms of the destination system's real IP address as opposed
<p> For each record in the /etc/shorewall/policy file, a chain is created. <p> For each record in the /etc/shorewall/policy file, a chain is created.
Policies in that file are expressed in terms of a source zone and destination Policies in that file are expressed in terms of a source zone and destination
zone where these zones may be a zone defined in /etc/shorewall/zones, "fw" zone where these zones may be a zone defined in /etc/shorewall/zones,
or "all". Policies specifying the pseudo-zone "all" matches all defined "fw" or "all". Policies specifying the pseudo-zone "all" matches all defined
zones and "fw". These chains are referred to as <i>Policy Chains.</i> Notice zones and "fw". These chains are referred to as <i>Policy Chains.</i> Notice
that for an ordered pair of zones (za,zb), the canonical chain (za2zb) that for an ordered pair of zones (za,zb), the canonical chain (za2zb)
may also be the policy chain for the pair or the policy chain may be a may also be the policy chain for the pair or the policy chain may be
different chain (za2all, for example). Packets from one zone to another a different chain (za2all, for example). Packets from one zone to another
will traverse chains as follows:</p> will traverse chains as follows:</p>
<ol> <ol>
<li> If the canonical chain exists, packets first traverse that <li> If the canonical chain exists, packets first traverse
chain.</li> that chain.</li>
<li> If the canonical chain and policy chain are different and <li> If the canonical chain and policy chain are different
the packet does not match a rule in the canonical chain, it then is sent and the packet does not match a rule in the canonical chain, it then
to the policy chain.</li> is sent to the policy chain.</li>
<li> If the canonical chain does not exist, packets are sent <li> If the canonical chain does not exist, packets are sent
immediately to the policy chain.</li> immediately to the policy chain.</li>
</ol> </ol>
<p> The canonical chain from zone za to zone zb will be created only if there <p> The canonical chain from zone za to zone zb will be created only if
are exception rules defined in /etc/shorewall/rules for packets going from there are exception rules defined in /etc/shorewall/rules for packets going
za to zb.</p> from za to zb.</p>
<p> Shorewall is built on top of the Netfilter kernel facility. Netfilter <p> Shorewall is built on top of the Netfilter kernel facility. Netfilter
implements connection tracking function that allow what is often referred implements connection tracking function that allow what is often referred
to as "statefull inspection" of packets. This statefull property allows to as "statefull inspection" of packets. This statefull property allows
firewall rules to be defined in terms of "connections" rather than firewall rules to be defined in terms of "connections" rather than in
in terms of "packets". With Shorewall, you:</p> terms of "packets". With Shorewall, you:</p>
<ol> <ol>
<li> Identify the client's zone.</li> <li> Identify the client's zone.</li>
<li> Identify the server's zone.</li> <li> Identify the server's zone.</li>
<li> If the POLICY from the client's zone to the server's zone <li> If the POLICY from the client's zone to the server's zone
is what you want for this client/server pair, you need do nothing further.</li> is what you want for this client/server pair, you need do nothing further.</li>
<li> If the POLICY is not what you want, then you must add a <li> If the POLICY is not what you want, then you must add
rule. That rule is expressed in terms of the client's zone and the a rule. That rule is expressed in terms of the client's zone and
server's zone.</li> the server's zone.</li>
</ol> </ol>
<p> Just because connections of a particular type are allowed between zone <p> Just because connections of a particular type are allowed between zone
A and the firewall and are also allowed between the firewall and zone B A and the firewall and are also allowed between the firewall and zone
<font color="#ff6633"><b><u> DOES NOT mean that these connections are B <font color="#ff6633"><b><u> DOES NOT mean that these connections
allowed between zone A and zone B</u></b></font>. It rather means that are allowed between zone A and zone B</u></b></font>. It rather means
you can have a proxy running on the firewall that accepts a connection that you can have a proxy running on the firewall that accepts a connection
from zone A and then establishes its own separate connection from the firewall from zone A and then establishes its own separate connection from the
to zone B.</p> firewall to zone B.</p>
<p> If you adopt the default policy of ACCEPT from the local zone to the <p> If you adopt the default policy of ACCEPT from the local zone to the
internet zone and you are having problems connecting from a local client internet zone and you are having problems connecting from a local client
@ -323,5 +327,6 @@ from zone A and then establishes its own separate connection from the firewall
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
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@ -12,12 +12,10 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Logging</font></h1> <h1 align="center"><font color="#ffffff">Logging</font></h1>
</td> </td>
</tr> </tr>
@ -88,19 +86,19 @@ file, you must restart syslogd before the changes can take effect.<br>
Beginning with Shorewall version 1.3.12, if your kernel has ULOG Beginning with Shorewall version 1.3.12, if your kernel has ULOG
target support (and most vendor-supplied kernels do), you may also specify target support (and most vendor-supplied kernels do), you may also specify
a log level of ULOG (must be all caps). When ULOG is used, Shorewall will a log level of ULOG (must be all caps). When ULOG is used, Shorewall will
direct netfilter to log the related messages via the ULOG target which will direct netfilter to log the related messages via the ULOG target which
send them to a process called 'ulogd'. The ulogd program is available from will send them to a process called 'ulogd'. The ulogd program is available
http://www.gnumonks.org/projects/ulogd and can be configured to log all from http://www.gnumonks.org/projects/ulogd and can be configured to log
Shorewall message to their own log file.<br> all Shorewall message to their own log file.<br>
<br> <br>
<b>Note: </b>The ULOG logging mechanism is <u>completely separate</u> from <b>Note: </b>The ULOG logging mechanism is <u>completely separate</u> from
syslog. Once you switch to ULOG, the settings in /etc/syslog.conf have absolutely syslog. Once you switch to ULOG, the settings in /etc/syslog.conf have absolutely
no effect on your Shorewall logging (except for Shorewall status messages no effect on your Shorewall logging (except for Shorewall status messages
which still go to syslog).<br> which still go to syslog).<br>
<br> <br>
You will need to have the kernel source available to compile ulogd.<br> You will need to have the kernel source available to compile ulogd.<br>
<br> <br>
Download the ulod tar file and:<br> Download the ulod tar file and:<br>
<ol> <ol>
<li>Be sure that /usr/src/linux is linked to your kernel source tree<br> <li>Be sure that /usr/src/linux is linked to your kernel source tree<br>
@ -115,9 +113,9 @@ Download the ulod tar file and:<br>
</li> </li>
</ol> </ol>
If you are like me and don't have a development environment on your firewall, If you are like me and don't have a development environment on your
you can do the first six steps on another system then either NFS mount firewall, you can do the first six steps on another system then either
your /usr/local/src directory or tar up the /usr/local/src/ulogd-<i>version</i> NFS mount your /usr/local/src directory or tar up the /usr/local/src/ulogd-<i>version</i>
directory and move it to your firewall system.<br> directory and move it to your firewall system.<br>
<br> <br>
Now on the firewall system, edit /usr/local/etc/ulogd.conf and set:<br> Now on the firewall system, edit /usr/local/etc/ulogd.conf and set:<br>
@ -129,9 +127,9 @@ your /usr/local/src directory or tar up the /usr/local/src/ulogd-<i>version</i>
</ol> </ol>
I also copied the file /usr/local/src/ulogd-<i>version</i>/ulogd.init I also copied the file /usr/local/src/ulogd-<i>version</i>/ulogd.init
to /etc/init.d/ulogd. I had to edit the line that read "daemon /usr/local/sbin/ulogd" to /etc/init.d/ulogd. I had to edit the line that read "daemon /usr/local/sbin/ulogd"
to read daemon /usr/local/sbin/ulogd -d". On a RedHat system, a simple to read daemon /usr/local/sbin/ulogd -d". On a RedHat system, a simple "chkconfig
"chkconfig --level 3 ulogd on" starts ulogd during boot up. Your init system --level 3 ulogd on" starts ulogd during boot up. Your init system may need
may need something else done to activate the script.<br> something else done to activate the script.<br>
<br> <br>
You will need to change all instances of log levels (usually 'info') in You will need to change all instances of log levels (usually 'info') in
your configuration files to 'ULOG' - this includes entries in the policy, your configuration files to 'ULOG' - this includes entries in the policy,
@ -140,17 +138,15 @@ rules and shorewall.conf files. Here's what I have:<br>
<pre> [root@gateway shorewall]# grep ULOG *<br> policy:loc&nbsp; fw&nbsp;&nbsp; REJECT&nbsp; ULOG<br> policy:net&nbsp; all&nbsp; DROP&nbsp;&nbsp;&nbsp; ULOG&nbsp;&nbsp;&nbsp;10/sec:40<br> policy:all&nbsp; all&nbsp; REJECT&nbsp; ULOG<br> rules:REJECT:ULOG loc net tcp 6667<br> shorewall.conf:TCP_FLAGS_LOG_LEVEL=ULOG<br> shorewall.conf:RFC1918_LOG_LEVEL=ULOG<br> [root@gateway shorewall]#<br></pre> <pre> [root@gateway shorewall]# grep ULOG *<br> policy:loc&nbsp; fw&nbsp;&nbsp; REJECT&nbsp; ULOG<br> policy:net&nbsp; all&nbsp; DROP&nbsp;&nbsp;&nbsp; ULOG&nbsp;&nbsp;&nbsp;10/sec:40<br> policy:all&nbsp; all&nbsp; REJECT&nbsp; ULOG<br> rules:REJECT:ULOG loc net tcp 6667<br> shorewall.conf:TCP_FLAGS_LOG_LEVEL=ULOG<br> shorewall.conf:RFC1918_LOG_LEVEL=ULOG<br> [root@gateway shorewall]#<br></pre>
Finally edit /etc/shorewall/shorewall.conf and set LOGFILE=<i>&lt;file Finally edit /etc/shorewall/shorewall.conf and set LOGFILE=<i>&lt;file
that you wish to log to&gt;</i>. This tells the /sbin/shorewall program that you wish to log to&gt;</i>. This tells the /sbin/shorewall program
where to look for the log when processing its "show log", "logwatch" and where to look for the log when processing its "show log", "logwatch" and "monitor"
"monitor" commands.<br> commands.<br>
<p><font size="2"> Updated 1/11/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2"> Updated 1/11/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <p><a href="copyright.htm"><font size="2">Copyright</font> &copy;
<font size="2">2001, 2002, 2003 Thomas M. Eastep</font></a><br> <font size="2">2001, 2002, 2003 Thomas M. Eastep</font></a><br>
</p> </p>
<br>
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@ -16,10 +16,11 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Shorewall Mirrors</font></h1> <h1 align="center"><font color="#ffffff">Shorewall Mirrors</font></h1>
</td> </td>
</tr> </tr>
@ -37,12 +38,12 @@
and is located in California, USA. It is mirrored at:</p> and is located in California, USA. It is mirrored at:</p>
<ul> <ul>
<li><a target="_top" href="http://slovakia.shorewall.net"> http://slovakia.shorewall.net</a> <li><a target="_top" href="http://slovakia.shorewall.net">
(Slovak Republic).</li> http://slovakia.shorewall.net</a> (Slovak Republic).</li>
<li> <a href="http://www.infohiiway.com/shorewall" <li> <a href="http://www.infohiiway.com/shorewall"
target="_top"> http://shorewall.infohiiway.com</a> (Texas, USA).</li> target="_top"> http://shorewall.infohiiway.com</a> (Texas, USA).</li>
<li><a target="_top" href="http://germany.shorewall.net"> http://germany.shorewall.net</a> <li><a target="_top" href="http://germany.shorewall.net">
(Hamburg, Germany)</li> http://germany.shorewall.net</a> (Hamburg, Germany)</li>
<li><a target="_top" <li><a target="_top"
href="http://france.shorewall.net">http://france.shorewall.net</a> href="http://france.shorewall.net">http://france.shorewall.net</a>
(Paris, France)</li> (Paris, France)</li>
@ -51,7 +52,9 @@
<li><a href="http://shorewall.greshko.com" target="_top">http://shorewall.greshko.com</a> <li><a href="http://shorewall.greshko.com" target="_top">http://shorewall.greshko.com</a>
(Taipei, Taiwan)</li> (Taipei, Taiwan)</li>
<li><a href="http://argentina.shorewall.net" target="_top">http://argentina.shorewall.net</a> <li><a href="http://argentina.shorewall.net" target="_top">http://argentina.shorewall.net</a>
(Argentina)<br> (Argentina)</li>
<li><a href="http://shorewall.securityopensource.org.br"
target="_top">http://shorewall.securityopensource.org.br</a> (Brazil)<br>
</li> </li>
<li><a href="http://www.shorewall.net" target="_top">http://www.shorewall.net</a> <li><a href="http://www.shorewall.net" target="_top">http://www.shorewall.net</a>
(Washington State, USA)<br> (Washington State, USA)<br>
@ -76,15 +79,15 @@
(Paris, France)</li> (Paris, France)</li>
<li><a href="ftp://shorewall.greshko.com/pub/shorewall" <li><a href="ftp://shorewall.greshko.com/pub/shorewall"
target="_top">ftp://shorewall.greshko.com</a> (Taipei, Taiwan)</li> target="_top">ftp://shorewall.greshko.com</a> (Taipei, Taiwan)</li>
<li><a href="ftp://ftp.shorewall.net/pub/shorewall" target="_blank">ftp://ftp.shorewall.net <li><a href="ftp://ftp.shorewall.net/pub/shorewall"
</a>(Washington State, USA)<br> target="_blank">ftp://ftp.shorewall.net </a>(Washington State, USA)<br>
</li> </li>
</ul> </ul>
Search results and the mailing list archives are always fetched from Search results and the mailing list archives are always fetched from
the site in Washington State.<br> the site in Washington State.<br>
<p align="left"><font size="2">Last Updated 6/19/2003 - <a <p align="left"><font size="2">Last Updated 7/15/2003 - <a
href="support.htm">Tom Eastep</a></font></p> href="support.htm">Tom Eastep</a></font></p>
<p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font <p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font
@ -98,5 +101,7 @@
<br> <br>
<br> <br>
<br> <br>
<br>
<br>
</body> </body>
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -32,10 +32,10 @@
<ul> <ul>
<li>A kernel that supports netfilter. I've tested with 2.4.2 - <li>A kernel that supports netfilter. I've tested with 2.4.2 -
2.4.20. With current releases of Shorewall, Traffic Shaping/Control requires 2.4.20. With current releases of Shorewall, Traffic Shaping/Control requires
at least 2.4.18.  <a href="kernel.htm"> Check here for kernel at least 2.4.18.  <a href="kernel.htm"> Check here for kernel configuration
configuration information.</a> If you are looking for a firewall information.</a> If you are looking for a firewall for use with
for use with 2.2 kernels, <a href="http://seawall.sf.net"> see 2.2 kernels, <a href="http://seawall.sf.net"> see the Seattle
the Seattle Firewall site</a> .</li> Firewall site</a> .</li>
<li>iptables 1.2 or later but beware version 1.2.3 -- see the <li>iptables 1.2 or later but beware version 1.2.3 -- see the
<a href="errata.htm">Errata</a>. <font color="#ff0000"><b>WARNING: <a href="errata.htm">Errata</a>. <font color="#ff0000"><b>WARNING:
</b></font>The buggy iptables version 1.2.3 is included in RedHat </b></font>The buggy iptables version 1.2.3 is included in RedHat
@ -81,5 +81,6 @@ have awk (gawk) installed.</li>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
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@ -18,7 +18,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -61,9 +61,9 @@ we must all first walk before we can run.<br>
<p>The <a href="shorewall_setup_guide.htm">Shorewall Setup Guide</a> (See <p>The <a href="shorewall_setup_guide.htm">Shorewall Setup Guide</a> (See
Index Below) outlines the steps necessary to set up a firewall Index Below) outlines the steps necessary to set up a firewall
where <b>there are multiple public IP addresses involved or where <b>there are multiple public IP addresses involved
if you want to learn more about Shorewall than is explained in or if you want to learn more about Shorewall than is explained
the single-address guides above.</b></p> in the single-address guides above.</b></p>
<ul> <ul>
@ -72,9 +72,9 @@ we must all first walk before we can run.<br>
<h2><a name="Documentation"></a>Documentation Index</h2> <h2><a name="Documentation"></a>Documentation Index</h2>
<p>The following documentation covers a variety of topics and <b>supplements <p>The following documentation covers a variety of topics and <b>supplements
the <a href="shorewall_quickstart_guide.htm">QuickStart Guides</a> the <a href="shorewall_quickstart_guide.htm">QuickStart
described above</b>. Please review the appropriate guide before Guides</a> described above</b>. Please review the appropriate
trying to use this documentation directly.</p> guide before trying to use this documentation directly.</p>
<ul> <ul>
<li><a <li><a
@ -162,10 +162,13 @@ a test configuration)</a></li>
href="Documentation.htm#Routestopped">routestopped</a></li> href="Documentation.htm#Routestopped">routestopped</a></li>
</ul> </ul>
</li>
<li><a href="CorpNetwork.htm">Corporate
Network Example</a> (Contributed by a Graeme Boyle)<br>
</li> </li>
<li><a href="dhcp.htm">DHCP</a></li> <li><a href="dhcp.htm">DHCP</a></li>
<li><a href="ECN.html">ECN Disabling by <li><a href="ECN.html">ECN Disabling by
host or subnet</a></li> host or subnet</a></li>
<li><a href="errata.htm">Errata</a><br> <li><a href="errata.htm">Errata</a><br>
</li> </li>
<li><font color="#000099"><a <li><font color="#000099"><a
@ -187,7 +190,8 @@ host or subnet</a></li>
href="kernel.htm">Kernel Configuration</a></font></li> href="kernel.htm">Kernel Configuration</a></font></li>
<li><a href="shorewall_logging.html">Logging</a><br> <li><a href="shorewall_logging.html">Logging</a><br>
</li> </li>
<li><a href="MAC_Validation.html">MAC Verification</a></li> <li><a href="MAC_Validation.html">MAC
Verification</a></li>
<li><a href="http://lists.shorewall.net">Mailing Lists</a><br> <li><a href="http://lists.shorewall.net">Mailing Lists</a><br>
</li> </li>
<li><a href="myfiles.htm">My Shorewall <li><a href="myfiles.htm">My Shorewall
@ -229,6 +233,7 @@ host or subnet</a></li>
</ul> </ul>
<ul> <ul>
<li><a href="shorewall_setup_guide.htm#RFC1918">4.5 RFC <li><a href="shorewall_setup_guide.htm#RFC1918">4.5 RFC
1918</a></li> 1918</a></li>
@ -243,23 +248,27 @@ host or subnet</a></li>
</ul> </ul>
<ul> <ul>
<li><a href="shorewall_setup_guide.htm#NonRouted">5.2 Non-routed</a> <li><a href="shorewall_setup_guide.htm#NonRouted">5.2 Non-routed</a>
<ul> <ul>
<li><a href="shorewall_setup_guide.htm#SNAT">5.2.1 SNAT</a></li> <li><a href="shorewall_setup_guide.htm#SNAT">5.2.1
<li><a href="shorewall_setup_guide.htm#DNAT">5.2.2 DNAT</a></li> SNAT</a></li>
<li><a href="shorewall_setup_guide.htm#DNAT">5.2.2
DNAT</a></li>
<li><a href="shorewall_setup_guide.htm#ProxyARP">5.2.3 <li><a href="shorewall_setup_guide.htm#ProxyARP">5.2.3
Proxy ARP</a></li> Proxy ARP</a></li>
<li><a href="shorewall_setup_guide.htm#NAT">5.2.4 Static <li><a href="shorewall_setup_guide.htm#NAT">5.2.4
NAT</a></li> Static NAT</a></li>
</ul> </ul>
</li> </li>
<li><a href="shorewall_setup_guide.htm#Rules">5.3 Rules</a></li> <li><a href="shorewall_setup_guide.htm#Rules">5.3 Rules</a></li>
<li><a href="shorewall_setup_guide.htm#OddsAndEnds">5.4 Odds <li><a href="shorewall_setup_guide.htm#OddsAndEnds">5.4
and Ends</a></li> Odds and Ends</a></li>
</ul> </ul>
</li> </li>
@ -285,7 +294,7 @@ host or subnet</a></li>
<li><a href="traffic_shaping.htm">Traffic <li><a href="traffic_shaping.htm">Traffic
Shaping/QOS</a></li> Shaping/QOS</a></li>
<li><a href="troubleshoot.htm">Troubleshooting (Things to try if it doesn't <li><a href="troubleshoot.htm">Troubleshooting (Things to try if it doesn't
work)</a><br> work)</a><br>
</li> </li>
<li><a href="upgrade_issues.htm">Upgrade Issues</a><br> <li><a href="upgrade_issues.htm">Upgrade Issues</a><br>
</li> </li>
@ -299,8 +308,8 @@ work)</a><br>
<li><a href="PPTP.htm">PPTP</a></li> <li><a href="PPTP.htm">PPTP</a></li>
<li><a href="6to4.htm">6t04</a><br> <li><a href="6to4.htm">6t04</a><br>
</li> </li>
<li><a href="VPN.htm">IPSEC/PPTP</a> from <li><a href="VPN.htm">IPSEC/PPTP</a>
a system behind your firewall to a remote network.</li> from a system behind your firewall to a remote network.</li>
</ul> </ul>
</li> </li>
@ -312,10 +321,12 @@ work)</a><br>
<p>If you use one of these guides and have a suggestion for improvement <a <p>If you use one of these guides and have a suggestion for improvement <a
href="mailto:webmaster@shorewall.net">please let me know</a>.</p> href="mailto:webmaster@shorewall.net">please let me know</a>.</p>
<p><font size="2">Last modified 7/6/2003 - <a href="support.htm">Tom Eastep</a></font></p> <p><font size="2">Last modified 7/16/2003 - <a href="support.htm">Tom Eastep</a></font></p>
<p><a href="copyright.htm"><font size="2">Copyright 2002, 2003 Thomas M. <p><a href="copyright.htm"><font size="2">Copyright 2002, 2003 Thomas M.
Eastep</font></a><br> Eastep</font></a><br>
</p> </p>
<br>
<br>
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@ -9,38 +9,31 @@
<title>Shoreline Firewall (Shorewall) 1.4</title> <title>Shoreline Firewall (Shorewall) 1.4</title>
<base target="_self"> <base
target="_self">
</head> </head>
<body> <body>
<table border="0" cellpadding="0" cellspacing="4" <table border="0" cellpadding="0" cellspacing="4"
style="border-collapse: collapse;" width="100%" id="AutoNumber3" style="border-collapse: collapse;" width="100%" id="AutoNumber3"
bgcolor="#4b017c"> bgcolor="#3366ff">
<tbody> <tbody>
<tr> <tr>
<td width="33%" height="90" valign="middle" <td width="33%" height="90"
align="left"><a href="http://www.cityofshoreline.com"><img valign="middle" align="left"><a href="http://www.cityofshoreline.com"><img
src="images/washington.jpg" alt="" width="97" height="80" hspace="4" src="images/washington.jpg" alt="" width="97" height="80" hspace="4"
border="0"> border="0">
</a></td> </a></td>
<td valign="middle" width="34%" align="center"> <td valign="middle"
bgcolor="#ffffff" width="34%" align="center">
<img
src="images/Logo1.png" alt="(Shorewall Logo)" width="341" height="80">
<h1><font color="#ffffff">Shorewall 1.4</font><i><font
color="#ffffff"> <small><small><small>"iptables made easy"</small></small></small></font></i></h1>
</td> </td>
<td valign="middle"> <td valign="top" width="33"><br>
<h1 align="center"><a href="http://www.shorewall.net"
target="_top"><br>
</a></h1>
<br>
</td> </td>
</tr> </tr>
@ -64,6 +57,7 @@
<h2 align="left">What is it?</h2> <h2 align="left">What is it?</h2>
@ -84,18 +78,18 @@
<p>This program is free software; you can redistribute it and/or modify <p>This program is free software; you can redistribute it and/or modify
it under the terms of <a it under the terms of <a
href="http://www.gnu.org/licenses/gpl.html">Version 2 of the href="http://www.gnu.org/licenses/gpl.html">Version 2 of the GNU
GNU General Public License</a> as published by the Free Software General Public License</a> as published by the Free Software
Foundation.<br> Foundation.<br>
<br> <br>
This program is distributed in This program is distributed
the hope that it will be useful, but in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the WITHOUT ANY WARRANTY; without even
implied warranty of MERCHANTABILITY or the implied warranty of MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE. See the GNU or FITNESS FOR A PARTICULAR PURPOSE. See the
General Public License for more details.<br> GNU General Public License for more details.<br>
<br> <br>
@ -116,6 +110,19 @@ GNU General Public License</a> as published by the Free Software
<h2>This is the Shorewall 1.4 Web Site</h2>
The information on this site applies only to 1.4.x releases of Shorewall.
For older versions:<br>
<ul>
<li>The 1.3 site is <a href="http://www.shorewall.net/1.3"
target="_top">here.</a></li>
<li>The 1.2 site is <a href="http://shorewall.net/1.2/"
target="_top">here</a>.<br>
</li>
</ul>
<h2>Getting Started with Shorewall</h2> <h2>Getting Started with Shorewall</h2>
New to Shorewall? Start by selecting the New to Shorewall? Start by selecting the
<a <a
@ -129,7 +136,7 @@ GNU General Public License</a> as published by the Free Software
<h2>Running Shorewall on Mandrake with a two-interface setup?</h2> <h2>Running Shorewall on Mandrake with a two-interface setup?</h2>
If so, the documentation<b> </b>on this site will If so, the documentation<b> </b>on this site will
not apply directly to your setup. If you want to use the documentation not apply directly to your setup. If you want to use the documentation
that you find here, you will want to consider uninstalling what you have that you find here, you will want to consider uninstalling what you have
and installing a setup that matches the documentation on this site. and installing a setup that matches the documentation on this site.
See the <a href="two-interface.htm">Two-interface QuickStart Guide</a> See the <a href="two-interface.htm">Two-interface QuickStart Guide</a>
@ -138,39 +145,48 @@ not apply directly to your setup. If you want to use the documentation
<h2><b>News</b></h2> <h2><b>News</b></h2>
<p><b>7/15/2003 - New Mirror in Brazil</b><b> <img border="0"
src="images/new10.gif" width="28" height="12" alt="(New)">
<br>
</b></p>
Thanks to the folks at securityopensource.org.br, there is now a <a
href="http://shorewall.securityopensource.org.br" target="_top">Shorewall
mirror in Brazil</a>.
<p><b>7/15/2003 - Shorewall-1.4.6 RC 1</b><b> <img border="0" <p><b>7/15/2003 - Shorewall-1.4.6 RC 1</b><b> <img border="0"
src="images/new10.gif" width="28" height="12" alt="(New)"> src="images/new10.gif" width="28" height="12" alt="(New)">
<br> <br>
</b> </p> </b> </p>
<blockquote><b><a <blockquote><b><a
href="http://shorewall.net/pub/shorewall/testing">http://shorewall.net/pub/shorewall/testing</a></b><b><a href="http://shorewall.net/pub/shorewall/testing">http://shorewall.net/pub/shorewall/testing</a></b><b><a
href="ftp://shorewall.net/pub/shorewall/testing" target="_top"><br> href="ftp://shorewall.net/pub/shorewall/testing" target="_top"><br>
ftp://shorewall.net/pub/shorewall/testing</a></b></blockquote> ftp://shorewall.net/pub/shorewall/testing</a></b></blockquote>
<p><b>Problems Corrected:</b><br> <p><b>Problems Corrected:</b><br>
</p> </p>
<ol> <ol>
<li>A problem seen on RH7.3 systems where Shorewall encountered <li>A problem seen on RH7.3 systems where Shorewall encountered
start errors when started using the "service" mechanism has been worked start errors when started using the "service" mechanism has been worked
around.<br> around.<br>
<br> <br>
</li> </li>
<li>Where a list of IP addresses appears in the DEST column of a <li>Where a list of IP addresses appears in the DEST column of
DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in the nat a DNAT[-] rule, Shorewall incorrectly created multiple DNAT rules in the
table (one for each element in the list). Shorewall now correctly creates nat table (one for each element in the list). Shorewall now correctly creates
a single DNAT rule with multiple "--to-destination" clauses.<br> a single DNAT rule with multiple "--to-destination" clauses.<br>
<br> <br>
</li> </li>
<li>Corrected a problem in Beta 1 where DNS names containing a "-" <li>Corrected a problem in Beta 1 where DNS names containing
were mis-handled when they appeared in the DEST column of a rule.<br> a "-" were mis-handled when they appeared in the DEST column of a rule.<br>
<br> <br>
</li> </li>
<li value="4">A number of problems with rule parsing have been corrected. <li value="4">A number of problems with rule parsing have been
Corrections involve the handling of "z1!z2" in the SOURCE column as well corrected. Corrections involve the handling of "z1!z2" in the SOURCE column
as lists in the ORIGINAL DESTINATION column.<br> as well as lists in the ORIGINAL DESTINATION column.<br>
</li> </li>
</ol> </ol>
@ -180,19 +196,19 @@ as lists in the ORIGINAL DESTINATION column.<br>
<ol> <ol>
<li>In earlier versions, an undocumented feature allowed entries <li>In earlier versions, an undocumented feature allowed entries
in the host file as follows:<br> in the host file as follows:<br>
<br> <br>
    z    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br>     z    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br>
<br> <br>
This capability was never documented and has been removed in 1.4.6 to allow This capability was never documented and has been removed in 1.4.6 to
entries of the following format:<br> allow entries of the following format:<br>
<br> <br>
    z   eth1:192.168.1.0/24,192.168.2.0/24<br>     z   eth1:192.168.1.0/24,192.168.2.0/24<br>
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have been <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have
removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically been removed from /etc/shorewall/shorewall.conf. These capabilities are
detected by Shorewall (see below).<br> now automatically detected by Shorewall (see below).<br>
</li> </li>
</ol> </ol>
@ -201,22 +217,22 @@ removed from /etc/shorewall/shorewall.conf. These capabilities are now automatic
</p> </p>
<ol> <ol>
<li>A 'newnotsyn' interface option has been added. This option may <li>A 'newnotsyn' interface option has been added. This option
be specified in /etc/shorewall/interfaces and overrides the setting NEWNOTSYN=No may be specified in /etc/shorewall/interfaces and overrides the setting
for packets arriving on the associated interface.<br> NEWNOTSYN=No for packets arriving on the associated interface.<br>
<br> <br>
</li> </li>
<li>The means for specifying a range of IP addresses in /etc/shorewall/masq <li>The means for specifying a range of IP addresses in /etc/shorewall/masq
to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for address to use for SNAT is now documented. ADD_SNAT_ALIASES=Yes is enabled for
ranges.<br> address ranges.<br>
<br> <br>
</li> </li>
<li>Shorewall can now add IP addresses to subnets other than the <li>Shorewall can now add IP addresses to subnets other than
first one on an interface.<br> the first one on an interface.<br>
<br> <br>
</li> </li>
<li>DNAT[-] rules may now be used to load balance (round-robin) <li>DNAT[-] rules may now be used to load balance (round-robin)
over a set of servers. Servers may be specified in a range of addresses over a set of servers. Servers may be specified in a range of addresses
given as &lt;first address&gt;-&lt;last address&gt;.<br> given as &lt;first address&gt;-&lt;last address&gt;.<br>
<br> <br>
Example:<br> Example:<br>
@ -225,8 +241,8 @@ over a set of servers. Servers may be specified in a range of addresses
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration
options have been removed and have been replaced by code that detects whether options have been removed and have been replaced by code that detects whether
these capabilities are present in the current kernel. The output of the these capabilities are present in the current kernel. The output of the
start, restart and check commands have been enhanced to report the outcome:<br> start, restart and check commands have been enhanced to report the outcome:<br>
<br> <br>
Shorewall has detected the following iptables/netfilter capabilities:<br> Shorewall has detected the following iptables/netfilter capabilities:<br>
@ -237,11 +253,11 @@ start, restart and check commands have been enhanced to report the outcome:<br>
<br> <br>
</li> </li>
<li>Support for the Connection Tracking Match Extension has been <li>Support for the Connection Tracking Match Extension has been
added. This extension is available in recent kernel/iptables releases and added. This extension is available in recent kernel/iptables releases
allows for rules which match against elements in netfilter's connection tracking and allows for rules which match against elements in netfilter's connection
table. Shorewall automatically detects the availability of this extension tracking table. Shorewall automatically detects the availability of this
and reports its availability in the output of the start, restart and check extension and reports its availability in the output of the start, restart
commands.<br> and check commands.<br>
<br> <br>
Shorewall has detected the following iptables/netfilter capabilities:<br> Shorewall has detected the following iptables/netfilter capabilities:<br>
   NAT: Available<br>    NAT: Available<br>
@ -250,18 +266,18 @@ allows for rules which match against elements in netfilter's connection trackin
   Connection Tracking Match: Available<br>    Connection Tracking Match: Available<br>
Verifying Configuration...<br> Verifying Configuration...<br>
<br> <br>
If this extension is available, the ruleset generated by Shorewall is If this extension is available, the ruleset generated by Shorewall
changed in the following ways:</li> is changed in the following ways:</li>
<ul> <ul>
<li>To handle 'norfc1918' filtering, Shorewall will not create <li>To handle 'norfc1918' filtering, Shorewall will not create
chains in the mangle table but will rather do all 'norfc1918' filtering in chains in the mangle table but will rather do all 'norfc1918' filtering
the filter table (rfc1918 chain).</li> in the filter table (rfc1918 chain).</li>
<li>Recall that Shorewall DNAT rules generate two netfilter rules; <li>Recall that Shorewall DNAT rules generate two netfilter
one in the nat table and one in the filter table. If the Connection Tracking rules; one in the nat table and one in the filter table. If the Connection
Match Extension is available, the rule in the filter table is extended to Tracking Match Extension is available, the rule in the filter table is extended
check that the original destination address was the same as specified (or to check that the original destination address was the same as specified
defaulted to) in the DNAT rule.<br> (or defaulted to) in the DNAT rule.<br>
<br> <br>
</li> </li>
@ -273,7 +289,7 @@ defaulted to) in the DNAT rule.<br>
<li>An 'ipcalc' command has been added to /sbin/shorewall.<br> <li>An 'ipcalc' command has been added to /sbin/shorewall.<br>
<br> <br>
      ipcalc [ &lt;address&gt; &lt;netmask&gt; | &lt;address&gt;/&lt;vlsm&gt;       ipcalc [ &lt;address&gt; &lt;netmask&gt; | &lt;address&gt;/&lt;vlsm&gt;
]<br> ]<br>
<br> <br>
Examples:<br> Examples:<br>
<br> <br>
@ -293,10 +309,10 @@ defaulted to) in the DNAT rule.<br>
<br> <br>
Warning:<br> Warning:<br>
<br> <br>
If your shell only supports 32-bit signed arithmatic (ash or dash), then If your shell only supports 32-bit signed arithmatic (ash or dash),
the ipcalc command produces incorrect information for IP addresses 128.0.0.0-1 then the ipcalc command produces incorrect information for IP addresses
and for /1 networks. Bash should produce correct information for all valid 128.0.0.0-1 and for /1 networks. Bash should produce correct information
IP addresses.<br> for all valid IP addresses.<br>
<br> <br>
</li> </li>
<li>An 'iprange' command has been added to /sbin/shorewall. <br> <li>An 'iprange' command has been added to /sbin/shorewall. <br>
@ -304,11 +320,12 @@ defaulted to) in the DNAT rule.<br>
      iprange &lt;address&gt;-&lt;address&gt;<br>       iprange &lt;address&gt;-&lt;address&gt;<br>
<br> <br>
This command decomposes a range of IP addressses into a list of network This command decomposes a range of IP addressses into a list of network
and host addresses. The command can be useful if you need to construct an and host addresses. The command can be useful if you need to construct
efficient set of rules that accept connections from a range of network addresses.<br> an efficient set of rules that accept connections from a range of network
addresses.<br>
<br> <br>
Note: If your shell only supports 32-bit signed arithmetic (ash or dash) Note: If your shell only supports 32-bit signed arithmetic (ash or dash)
then the range may not span 128.0.0.0.<br> then the range may not span 128.0.0.0.<br>
<br> <br>
Example:<br> Example:<br>
<br> <br>
@ -327,7 +344,8 @@ then the range may not span 128.0.0.0.<br>
      [root@gateway root]#<br>       [root@gateway root]#<br>
<br> <br>
</li> </li>
<li>A list of host/net addresses is now allowed in an entry in /etc/shorewall/hosts.<br> <li>A list of host/net addresses is now allowed in an entry in
/etc/shorewall/hosts.<br>
<br> <br>
Example:<br> Example:<br>
<br> <br>
@ -341,37 +359,44 @@ then the range may not span 128.0.0.0.<br>
<p><b>6/17/2003 - Shorewall-1.4.5</b><b> </b></p> <p><b>6/17/2003 - Shorewall-1.4.5</b><b> </b></p>
<p>Problems Corrected:<br> <p>Problems Corrected:<br>
</p> </p>
<ol> <ol>
<li>The command "shorewall debug try &lt;directory&gt;" now <li>The command "shorewall debug try &lt;directory&gt;"
correctly traces the attempt.</li> now correctly traces the attempt.</li>
<li>The INCLUDE directive now works properly in the zones <li>The INCLUDE directive now works properly in the zones
file; previously, INCLUDE in that file was ignored.</li> file; previously, INCLUDE in that file was ignored.</li>
<li>/etc/shorewall/routestopped records with an empty second <li>/etc/shorewall/routestopped records with an empty
column are no longer ignored.<br> second column are no longer ignored.<br>
</li> </li>
</ol> </ol>
<p>New Features:<br> <p>New Features:<br>
</p> </p>
<ol> <ol>
<li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-] <li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-]
rule may now contain a list of addresses. If the list begins with "!' rule may now contain a list of addresses. If the list begins with "!'
then the rule will take effect only if the original destination address then the rule will take effect only if the original destination address
in the connection request does not match any of the addresses listed.</li> in the connection request does not match any of the addresses listed.</li>
</ol> </ol>
<p><b>6/15/2003 - Shorewall, Kernel 2.4.21 and iptables 1.2.8</b><b> <p><b>6/15/2003 - Shorewall, Kernel 2.4.21 and iptables 1.2.8</b><b>
</b></p> </b></p>
The firewall at shorewall.net has been upgraded to the 2.4.21 The firewall at shorewall.net has been upgraded to the 2.4.21
kernel and iptables 1.2.8 (using the "official" RPM from netfilter.org). kernel and iptables 1.2.8 (using the "official" RPM from netfilter.org).
No problems have been encountered with this set of software. The Shorewall No problems have been encountered with this set of software. The Shorewall
version is 1.4.4b plus the accumulated changes for 1.4.5. version is 1.4.4b plus the accumulated changes for 1.4.5.
<p><b>6/8/2003 - Updated Samples</b><b> </b></p> <p><b>6/8/2003 - Updated Samples</b><b> </b></p>
@ -385,14 +410,17 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
<ol> <ol>
</ol> </ol>
<p><b></b></p> <p><b></b></p>
<p><b></b></p> <p><b></b></p>
@ -400,12 +428,14 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
<blockquote> <blockquote>
<ol> <ol>
</ol> </ol>
</blockquote> </blockquote>
@ -419,33 +449,36 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
<p><b><a href="News.htm">More News</a></b></p> <p><b><a href="News.htm">More News</a></b></p>
<b> </b> <b> </b>
<h2><b> </b></h2> <h2><b> </b></h2>
<b> </b> <b> </b>
<p> <a href="http://leaf.sourceforge.net" target="_top"><img <p> <a href="http://leaf.sourceforge.net" target="_top"><img
border="0" src="images/leaflogo.gif" width="49" height="36" border="0" src="images/leaflogo.gif" width="49" height="36"
alt="(Leaf Logo)"> alt="(Leaf Logo)">
</a>Jacques Nilo and Eric Wolzak </a>Jacques Nilo and Eric
have a LEAF (router/firewall/gateway Wolzak have a LEAF (router/firewall/gateway
on a floppy, CD or compact flash) distribution on a floppy, CD or compact flash) distribution
called <i>Bering</i> that features called <i>Bering</i> that
Shorewall-1.4.2 and Kernel-2.4.20. features Shorewall-1.4.2 and Kernel-2.4.20.
You can find their work at: <a You can find their work at:
href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo</a></p> <a href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo</a></p>
<b>Congratulations to Jacques <b>Congratulations to Jacques
and Eric on the recent release of Bering 1.2!!! and Eric on the recent release of Bering
</b><br> 1.2!!! </b><br>
@ -459,12 +492,14 @@ You can find their work at: <a
<h4><b> </b></h4> <h4><b> </b></h4>
<b> </b> <b> </b>
<h2><b>This site is hosted by the generous folks at <a <h2><b>This site is hosted by the generous folks at <a
href="http://www.sf.net">SourceForge.net</a> </b></h2> href="http://www.sf.net">SourceForge.net</a> </b></h2>
<b> </b> <b> </b>
@ -472,18 +507,22 @@ You can find their work at: <a
<h2><b><a name="Donations"></a>Donations</b></h2>
<b> </b></td>
<td width="88" bgcolor="#4b017c" <h2><b><a name="Donations"></a>Donations</b></h2>
<b>
</b></td>
<td width="88" bgcolor="#3366ff"
valign="top" align="center"> valign="top" align="center">
<form method="post" <form method="post"
action="http://lists.shorewall.net/cgi-bin/htsearch"> action="http://lists.shorewall.net/cgi-bin/htsearch">
<p><strong><br> <p><strong><br>
<font color="#ffffff"><b>Note: </b></font></strong> <font color="#ffffff"><b>Note: </b></font></strong>
<font color="#ffffff">Search is unavailable Daily <font color="#ffffff">Search is unavailable Daily
@ -508,6 +547,7 @@ You can find their work at: <a
<p><font color="#ffffff"><b> <a <p><font color="#ffffff"><b> <a
href="http://lists.shorewall.net/htdig/search.html"> <font href="http://lists.shorewall.net/htdig/search.html"> <font
color="#ffffff">Extended Search</font></a></b></font></p> color="#ffffff">Extended Search</font></a></b></font></p>
@ -531,7 +571,7 @@ You can find their work at: <a
<table border="0" cellpadding="5" cellspacing="0" <table border="0" cellpadding="5" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber2" style="border-collapse: collapse;" width="100%" id="AutoNumber2"
bgcolor="#4b017c"> bgcolor="#3366ff">
<tbody> <tbody>
@ -553,12 +593,13 @@ You can find their work at: <a
<p align="center"><font size="4" color="#ffffff"><br> <p align="center"><font size="4" color="#ffffff"><br>
<font size="+2">Shorewall is free but if you try it <font size="+2">Shorewall is free but if you try
and find it useful, please consider making a donation it and find it useful, please consider making a donation
to <a to
href="http://www.starlight.org"><font color="#ffffff">Starlight Children's <a href="http://www.starlight.org"><font color="#ffffff">Starlight
Foundation.</font></a> Thanks!</font></font></p> Children's Foundation.</font></a> Thanks!</font></font></p>
</td> </td>
@ -572,6 +613,7 @@ You can find their work at: <a
<p><font size="2">Updated 7/15/2003 - <a href="support.htm">Tom Eastep</a></font> <p><font size="2">Updated 7/15/2003 - <a href="support.htm">Tom Eastep</a></font>
<br> <br>
</p> </p>
<br>
</body> </body>
</html> </html>

62
Shorewall-docs/standalone.htm
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber6" bgcolor="#400169" height="90"> id="AutoNumber6" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -45,16 +45,16 @@
<p>Shorewall requires that you have the iproute/iproute2 package installed <p>Shorewall requires that you have the iproute/iproute2 package installed
(on RedHat, the package is called <i>iproute</i>)<i>. </i>You can tell (on RedHat, the package is called <i>iproute</i>)<i>. </i>You can tell
if this package is installed by the presence of an <b>ip</b> program if this package is installed by the presence of an <b>ip</b> program on
on your firewall system. As root, you can use the 'which' command to your firewall system. As root, you can use the 'which' command to check
check for this program:</p> for this program:</p>
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre> <pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
<p>I recommend that you read through the guide first to familiarize yourself <p>I recommend that you read through the guide first to familiarize yourself
with what's involved then go back through it again making your configuration with what's involved then go back through it again making your configuration
changes.  Points at which configuration changes are recommended are changes.  Points at which configuration changes are recommended are flagged
flagged with <img border="0" src="images/BD21298_.gif" width="13" with <img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
.</p> .</p>
@ -68,8 +68,9 @@ disk, you must run dos2unix against the copy before using it with Shorewall.</p
<ul> <ul>
<li><a href="http://www.simtel.net/pub/pd/51438.html">Windows <li><a href="http://www.simtel.net/pub/pd/51438.html">Windows
Version of dos2unix</a></li> Version of dos2unix</a></li>
<li><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux <li><a
Version of dos2unix</a></li> href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version
of dos2unix</a></li>
</ul> </ul>
@ -118,11 +119,11 @@ one zone is defined:</p>
in terms of zones.</p> in terms of zones.</p>
<ul> <ul>
<li>You express your default policy for connections from one zone <li>You express your default policy for connections from one
to another zone in the<a href="Documentation.htm#Policy"> /etc/shorewall/policy zone to another zone in the<a href="Documentation.htm#Policy"> /etc/shorewall/policy
</a>file.</li> </a>file.</li>
<li>You define exceptions to those default policies in the <a <li>You define exceptions to those default policies in the
href="Documentation.htm#Rules">/etc/shorewall/rules </a>file.</li> <a href="Documentation.htm#Rules">/etc/shorewall/rules </a>file.</li>
</ul> </ul>
@ -133,8 +134,8 @@ one zone is defined:</p>
the request is first checked against the rules in /etc/shorewall/common the request is first checked against the rules in /etc/shorewall/common
(the samples provide that file for you).</p> (the samples provide that file for you).</p>
<p>The /etc/shorewall/policy file included with the one-interface sample <p>The /etc/shorewall/policy file included with the one-interface sample has
has the following policies:</p> the following policies:</p>
<blockquote> <blockquote>
<table border="1" cellpadding="2" style="border-collapse: collapse;" <table border="1" cellpadding="2" style="border-collapse: collapse;"
@ -179,9 +180,9 @@ has the following policies:</p>
<ol> <ol>
<li>allow all connection requests from the firewall to the internet</li> <li>allow all connection requests from the firewall to the internet</li>
<li>drop (ignore) all connection requests from the internet to <li>drop (ignore) all connection requests from the internet to
your firewall</li> your firewall</li>
<li>reject all other connection requests (Shorewall requires this <li>reject all other connection requests (Shorewall requires
catchall policy).</li> this catchall policy).</li>
</ol> </ol>
@ -235,8 +236,8 @@ option list. </p>
<p align="left">These addresses are sometimes referred to as <i>non-routable</i> <p align="left">These addresses are sometimes referred to as <i>non-routable</i>
because the Internet backbone routers will not forward a packet whose because the Internet backbone routers will not forward a packet whose
destination address is reserved by RFC 1918. In some cases though, destination address is reserved by RFC 1918. In some cases though, ISPs
ISPs are assigning these addresses then using <i>Network Address Translation are assigning these addresses then using <i>Network Address Translation
</i>to rewrite packet headers when forwarding to/from the internet.</p> </i>to rewrite packet headers when forwarding to/from the internet.</p>
<p align="left"><img border="0" src="images/BD21298_.gif" align="left" <p align="left"><img border="0" src="images/BD21298_.gif" align="left"
@ -285,8 +286,8 @@ ISPs are assigning these addresses then using <i>Network Address Translat
</div> </div>
<div align="left"> <div align="left">
<p align="left">Example - You want to run a Web Server and a POP3 Server <p align="left">Example - You want to run a Web Server and a POP3 Server on
on your firewall system:</p> your firewall system:</p>
</div> </div>
<div align="left"> <div align="left">
@ -329,13 +330,13 @@ on your firewall system:</p>
<div align="left"> <div align="left">
<p align="left">If you don't know what port and protocol a particular application <p align="left">If you don't know what port and protocol a particular application
uses, see <a href="ports.htm">here</a>.</p> uses, see <a href="ports.htm">here</a>.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left"><b>Important: </b>I don't recommend enabling telnet to/from <p align="left"><b>Important: </b>I don't recommend enabling telnet to/from
the internet because it uses clear text (even for login!). If you the internet because it uses clear text (even for login!). If you want
want shell access to your firewall from the internet, use SSH:</p> shell access to your firewall from the internet, use SSH:</p>
</div> </div>
<div align="left"> <div align="left">
@ -386,7 +387,7 @@ want shell access to your firewall from the internet, use SSH:</p>
version 1.3.9 startup is disabled so that your system won't try to start version 1.3.9 startup is disabled so that your system won't try to start
Shorewall before configuration is complete. Once you have completed configuration Shorewall before configuration is complete. Once you have completed configuration
of your firewall, you can enable Shorewall startup by removing the file of your firewall, you can enable Shorewall startup by removing the file
/etc/shorewall/startup_disabled.<br> /etc/shorewall/startup_disabled.<br>
</p> </p>
<p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Users of the .deb <p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Users of the .deb
@ -396,8 +397,8 @@ want shell access to your firewall from the internet, use SSH:</p>
<div align="left"> <div align="left">
<p align="left">The firewall is started using the "shorewall start" command <p align="left">The firewall is started using the "shorewall start" command
and stopped using "shorewall stop". When the firewall is stopped, and stopped using "shorewall stop". When the firewall is stopped, routing
routing is enabled on those hosts that have an entry in <a is enabled on those hosts that have an entry in <a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. A href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. A
running firewall may be restarted using the "shorewall restart" command. running firewall may be restarted using the "shorewall restart" command.
If you want to totally remove any trace of Shorewall from your Netfilter If you want to totally remove any trace of Shorewall from your Netfilter
@ -407,9 +408,9 @@ routing is enabled on those hosts that have an entry in <a
<div align="left"> <div align="left">
<p align="left"><b>WARNING: </b>If you are connected to your firewall from <p align="left"><b>WARNING: </b>If you are connected to your firewall from
the internet, do not issue a "shorewall stop" command unless you have the internet, do not issue a "shorewall stop" command unless you have
added an entry for the IP address that you are connected from to added an entry for the IP address that you are connected from to <a
<a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
Also, I don't recommend using "shorewall restart"; it is better to create Also, I don't recommend using "shorewall restart"; it is better to create
an <i><a href="configuration_file_basics.htm#Configs">alternate configuration</a></i> an <i><a href="configuration_file_basics.htm#Configs">alternate configuration</a></i>
and test it using the <a and test it using the <a
href="starting_and_stopping_shorewall.htm">"shorewall try" command</a>.</p> href="starting_and_stopping_shorewall.htm">"shorewall try" command</a>.</p>
@ -429,5 +430,6 @@ routing is enabled on those hosts that have an entry in <a
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

176
Shorewall-docs/standalone_fr.html
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber6" bgcolor="#400169" height="90"> id="AutoNumber6" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -32,58 +32,58 @@
<p align="left"><small><i><u>Notes du traducteur</u> :<br> <p align="left"><small><i><u>Notes du traducteur</u> :<br>
Je ne prétends pas être un vrai traducteur dans le sens ou mon travail Je ne prétends pas être un vrai traducteur dans le sens ou mon travail
n'est pas des plus précis (loin de là...). Je ne me suis pas attaché à une n'est pas des plus précis (loin de là...). Je ne me suis pas attaché à une
traduction exacte du texte, mais plutôt à en faire une version française traduction exacte du texte, mais plutôt à en faire une version française intelligible
intelligible par tous (et par moi). Les termes techniques sont la plupart par tous (et par moi). Les termes techniques sont la plupart du temps conservés
du temps conservés sous leur forme originale et mis entre parenthèses car sous leur forme originale et mis entre parenthèses car vous pouvez les retrouver
vous pouvez les retrouver dans le reste des documentations ainsi que dans dans le reste des documentations ainsi que dans les fichiers de configuration.
les fichiers de configuration. N?hésitez pas à me contacter afin d?améliorer N?hésitez pas à me contacter afin d?améliorer ce document <a
ce document <a href="mailto:vetsel.patrice@wanadoo.fr">VETSEL Patrice</a> href="mailto:vetsel.patrice@wanadoo.fr">VETSEL Patrice</a> (merci à JMM
(merci à JMM pour sa relecture et ses commentaires pertinents, ainsi qu'à pour sa relecture et ses commentaires pertinents, ainsi qu'à Tom EASTEP pour
Tom EASTEP pour son formidable outil et sa disponibilité)</i><i>.</i></small></p> son formidable outil et sa disponibilité)</i><i>.</i></small></p>
<p align="left">Mettre en place un système Linux en tant que firewall (écluse) <p align="left">Mettre en place un système Linux en tant que firewall (écluse)
pour un petit réseau est une chose assez simple, si vous comprenez les bases pour un petit réseau est une chose assez simple, si vous comprenez les bases
et suivez la documentation.</p> et suivez la documentation.</p>
<p>Ce guide ne veut pas vous apprendre tous les rouages de Shorewall. Il se <p>Ce guide ne veut pas vous apprendre tous les rouages de Shorewall. Il
focalise sur ce qui est nécessaire pour configurer Shorewall, dans son utilisation se focalise sur ce qui est nécessaire pour configurer Shorewall, dans son
la plus courante :</p> utilisation la plus courante :</p>
<ul> <ul>
<li>Un système Linux</li> <li>Un système Linux</li>
<li>Une seule adresse IP externe</li> <li>Une seule adresse IP externe</li>
<li>Une connexion passant par un modem câble, ADSL, ISDN, Frame Relay, <li>Une connexion passant par un modem câble, ADSL, ISDN, Frame Relay,
rtc...</li> rtc...</li>
</ul> </ul>
<p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'installé. Vous <p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'installé.
pouvez voir si le paquet est installé en vérifiant la présence du programme Vous pouvez voir si le paquet est installé en vérifiant la présence du programme
ip sur votre système de firewall. Sous root, utilisez la commande 'which' ip sur votre système de firewall. Sous root, utilisez la commande 'which'
pour rechercher le programme :</p> pour rechercher le programme :</p>
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre> <pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
<p>Je vous recommande dans un premier temps de parcourir tout le guide pour <p>Je vous recommande dans un premier temps de parcourir tout le guide pour
vous familiariser avec ce qu'il va se passer, et de revenir au début en effectuant vous familiariser avec ce qu'il va se passer, et de revenir au début en
le changements dans votre configuration. Les points, où les changements dans effectuant le changements dans votre configuration. Les points, où les changements
la configuration sont recommandées, sont signalés par une <img dans la configuration sont recommandées, sont signalés par une <img
border="0" src="images/BD21298_.gif" width="13" height="13"> border="0" src="images/BD21298_.gif" width="13" height="13">
.</p> .</p>
<p><img border="0" src="images/j0213519.gif" width="60" height="60"> <p><img border="0" src="images/j0213519.gif" width="60" height="60">
Si vous éditez vos fichiers de configuration sur un système Windows, vous Si vous éditez vos fichiers de configuration sur un système Windows, vous
devez les sauver comme des fichiers Unix si votre éditeur supporte cette devez les sauver comme des fichiers Unix si votre éditeur supporte cette
option sinon vous devez les faire passer par dos2unix avant d'essayer de option sinon vous devez les faire passer par dos2unix avant d'essayer de les
les utiliser. De la même manière, si vous copiez un fichier de configuration utiliser. De la même manière, si vous copiez un fichier de configuration depuis
depuis votre disque dur Windows vers une disquette, vous devez lancer dos2unix votre disque dur Windows vers une disquette, vous devez lancer dos2unix sur
sur la copie avant de l'utiliser avec Shorewall.</p> la copie avant de l'utiliser avec Shorewall.</p>
<ul> <ul>
<li><a href="http://www.simtel.net/pub/pd/51438.html">Windows Version <li><a href="http://www.simtel.net/pub/pd/51438.html">Windows Version
of dos2unix</a></li> of dos2unix</a></li>
<li><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version <li><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux
of dos2unix</a></li> Version of dos2unix</a></li>
</ul> </ul>
@ -93,7 +93,7 @@ of dos2unix</a></li>
alt=""> alt="">
Les fichiers de configuration pour Shorewall sont situés dans le répertoire Les fichiers de configuration pour Shorewall sont situés dans le répertoire
/etc/shorewall -- pour de simples paramétrages, vous n'avez à faire qu'avec /etc/shorewall -- pour de simples paramétrages, vous n'avez à faire qu'avec
quelques un d'entre eux comme décris dans ce guide. Après avoir <a quelques un d'entre eux comme décris dans ce guide. Après avoir <a
href="Install.htm">installé Shorewall</a>, <b>téléchargez le <a href="Install.htm">installé Shorewall</a>, <b>téléchargez le <a
href="http://www1.shorewall.net/pub/shorewall/Samples/">one-interface sample</a>, href="http://www1.shorewall.net/pub/shorewall/Samples/">one-interface sample</a>,
un-tarez le (tar -zxvf one-interface.tgz) et copiez les fichiers vers /etc/shorewall un-tarez le (tar -zxvf one-interface.tgz) et copiez les fichiers vers /etc/shorewall
@ -101,12 +101,12 @@ un-tarez le (tar -zxvf one-interface.tgz) et copiez les fichiers vers /etc/shor
installés lors de l'installation de Shorewall)</b>.</p> installés lors de l'installation de Shorewall)</b>.</p>
<p>Parallèlement à la description, je vous suggère de jeter un oeil à ceux <p>Parallèlement à la description, je vous suggère de jeter un oeil à ceux
physiquement présents sur votre système -- chacun des fichiers contient des physiquement présents sur votre système -- chacun des fichiers contient
instructions de configuration détaillées et des entrées par défaut.</p> des instructions de configuration détaillées et des entrées par défaut.</p>
<p>Shorewall voit le réseau où il tourne comme composé par un ensemble de <p>Shorewall voit le réseau où il tourne comme composé par un ensemble de
<i>zones.</i> Dans les fichiers de configuration fournis pour une unique interface, <i>zones.</i> Dans les fichiers de configuration fournis pour une unique
une seule zone est définie :</p> interface, une seule zone est définie :</p>
<table border="0" style="border-collapse: collapse;" cellpadding="3" <table border="0" style="border-collapse: collapse;" cellpadding="3"
cellspacing="0" id="AutoNumber2"> cellspacing="0" id="AutoNumber2">
@ -126,30 +126,31 @@ une seule zone est d
<p>Les zones de Shorewall sont définies dans <a <p>Les zones de Shorewall sont définies dans <a
href="Documentation.htm#Zones"> /etc/shorewall/zones</a>.</p> href="Documentation.htm#Zones"> /etc/shorewall/zones</a>.</p>
<p>Shorewall reconnaît aussi le système de firewall comme sa propre zone - <p>Shorewall reconnaît aussi le système de firewall comme sa propre zone
par défaut, le firewall lui-même est connu en tant que <b>fw</b>.</p> - par défaut, le firewall lui-même est connu en tant que <b>fw</b>.</p>
<p>Les règles concernant le trafic à autoriser ou à interdire sont exprimées <p>Les règles concernant le trafic à autoriser ou à interdire sont exprimées
en utilisant les termes de zones.</p> en utilisant les termes de zones.</p>
<ul> <ul>
<li>Vous exprimez les politiques par défaut pour les connexions d'une <li>Vous exprimez les politiques par défaut pour les connexions d'une
zone à une autre dans le fichier<a href="Documentation.htm#Policy"> /etc/shorewall/policy zone à une autre dans le fichier<a href="Documentation.htm#Policy"> /etc/shorewall/policy
</a>.</li> </a>.</li>
<li>Vous définissez les exceptions à ces règles de politiques par défaut <li>Vous définissez les exceptions à ces règles de politiques par défaut
dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li> dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li>
</ul> </ul>
<p>Pour chacune des demandes de connexion entrantes dans le firewall, les <p>Pour chacune des demandes de connexion entrantes dans le firewall, les
demandes sont en premier lieu comparées par rapport au fichier /etc/shorewall/rules. demandes sont en premier lieu comparées par rapport au fichier /etc/shorewall/rules.
Si aucune des règles dans ce fichier ne correspondent, alors la première politique Si aucune des règles dans ce fichier ne correspondent, alors la première
dans /etc/shorewall/policy qui y correspond est appliquée. Si cette politique politique dans /etc/shorewall/policy qui y correspond est appliquée. Si cette
est REJECT ou DROP la requête est alors comparée par rapport aux règles contenues politique est REJECT ou DROP la requête est alors comparée par rapport aux
dans /etc/shorewall/common (l'archive d'exemple vous fournit ce fichier).</p> règles contenues dans /etc/shorewall/common (l'archive d'exemple vous fournit
ce fichier).</p>
<p>Le fichier /etc/shorewall/policy d'exemple contenu dans l'archive one-interface <p>Le fichier /etc/shorewall/policy d'exemple contenu dans l'archive one-interface
a les politiques suivantes :</p> a les politiques suivantes :</p>
<blockquote> <blockquote>
<table border="1" cellpadding="2" style="border-collapse: collapse;" <table border="1" cellpadding="2" style="border-collapse: collapse;"
@ -200,33 +201,33 @@ a les politiques suivantes :</p>
<li>drop (ignorer) toutes les demandes de connexion depuis l'Internet <li>drop (ignorer) toutes les demandes de connexion depuis l'Internet
vers votre firewall</li> vers votre firewall</li>
<li>rejeter toutes les autres requêtes de connexion (Shorewall à besoin <li>rejeter toutes les autres requêtes de connexion (Shorewall à besoin
de cette politique).</li> de cette politique).</li>
</ol> </ol>
<p>A ce point, éditez votre /etc/shorewall/policy et faites y les changements <p>A ce point, éditez votre /etc/shorewall/policy et faites y les changements
que vous désirez.</p> que vous désirez.</p>
<h2 align="left">Interface Externe</h2> <h2 align="left">Interface Externe</h2>
<p align="left">Le firewall possède une seule interface réseau. Lorsque la <p align="left">Le firewall possède une seule interface réseau. Lorsque la
connexion Internet passe par un modem câble ou par un routeur ADSL (pas un connexion Internet passe par un modem câble ou par un routeur ADSL (pas
simple modem), l'<i>External Interface</i> (interface externe) sera l'adaptateur un simple modem), l'<i>External Interface</i> (interface externe) sera l'adaptateur
ethernet (<b>eth0</b>) qui y est connecté <u>à moins que</u> vous vous connectiez ethernet (<b>eth0</b>) qui y est connecté <u>à moins que</u> vous vous connectiez
par <i><u>P</u>oint-to-<u>P</u>oint <u>P</u>rotocol over <u>E</u>thernet</i> par <i><u>P</u>oint-to-<u>P</u>oint <u>P</u>rotocol over <u>E</u>thernet</i>
(PPPoE) ou <i><u>P</u>oint-to-<u>P</u>oint <u>T</u>unneling<u>P</u>rotocol</i>(PPTP) (PPPoE) ou <i><u>P</u>oint-to-<u>P</u>oint <u>T</u>unneling<u>P</u>rotocol</i>(PPTP)
dans ce cas l'interface externe sera <b>ppp0</b>. Si vous vous connectez dans ce cas l'interface externe sera <b>ppp0</b>. Si vous vous connectez
par un simple modem (RTC), votre interface externe sera aussi <b>ppp0</b>. par un simple modem (RTC), votre interface externe sera aussi <b>ppp0</b>.
Si vous vous connectez en utilisant l'ISDN (numéris), votre interface externe Si vous vous connectez en utilisant l'ISDN (numéris), votre interface externe
sera<b> ippp0.</b></p> sera<b> ippp0.</b></p>
<p align="left"><img border="0" src="images/BD21298_3.gif" width="13" <p align="left"><img border="0" src="images/BD21298_3.gif" width="13"
height="13"> height="13">
L'exemple de configuration de Shorewall pour une interface suppose que L'exemple de configuration de Shorewall pour une interface suppose que
votre interface externe est <b>eth0</b>. Si votre configuration est différente, votre interface externe est <b>eth0</b>. Si votre configuration est différente,
vous devrez modifier le fichier d'exemple /etc/shorewall/interfaces en conséquence. vous devrez modifier le fichier d'exemple /etc/shorewall/interfaces en conséquence.
Puisque vous y êtes, vous pourriez parcourir la liste d'options qui sont Puisque vous y êtes, vous pourriez parcourir la liste d'options qui sont
spécifiées pour l'interface. Quelques astuces :</p> spécifiées pour l'interface. Quelques astuces :</p>
<ul> <ul>
<li> <li>
@ -237,7 +238,7 @@ sp
<li> <li>
<p align="left"> Si votre interface externe est <b>ppp0</b> ou <b>ippp0</b> <p align="left"> Si votre interface externe est <b>ppp0</b> ou <b>ippp0</b>
ou bien si vous avez une adresse IP statique, vous pouvez enlever le "dhcp" ou bien si vous avez une adresse IP statique, vous pouvez enlever le "dhcp"
de la liste d'option. </p> de la liste d'option. </p>
</li> </li>
</ul> </ul>
@ -247,8 +248,8 @@ de la liste d'option. </p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">La RFC 1918 définie plusieurs plage d'adresses IP privée (<i>Private</i>IP) <p align="left">La RFC 1918 définie plusieurs plage d'adresses IP privée
pour l'utilisation dans des réseaux privés :</p> (<i>Private</i>IP) pour l'utilisation dans des réseaux privés :</p>
<div align="left"> <div align="left">
<pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre> <pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre>
@ -256,16 +257,16 @@ pour l'utilisation dans des r
<p align="left">Ces adresses sont parfois désignées comme étant <i>non-routables</i> <p align="left">Ces adresses sont parfois désignées comme étant <i>non-routables</i>
car les routeurs sur les backbones Internet ne font pas passer les paquets car les routeurs sur les backbones Internet ne font pas passer les paquets
dont les adresses de destinations sont définies dans la RFC 1918. Dans certains dont les adresses de destinations sont définies dans la RFC 1918. Dans certains
cas, les fournisseurs (provider ou ISP) utilisent ces adresses et utilisent cas, les fournisseurs (provider ou ISP) utilisent ces adresses et utilisent
le <i>Network Address Translation </i>afin de récrire les entêtes des paquets le <i>Network Address Translation </i>afin de récrire les entêtes des paquets
lorsqu'ils les font circuler depuis ou vers l'Internet.</p> lorsqu'ils les font circuler depuis ou vers l'Internet.</p>
<p align="left"><img border="0" src="images/BD21298_.gif" align="left" <p align="left"><img border="0" src="images/BD21298_.gif" align="left"
width="13" height="13"> width="13" height="13">
Avant de lancer Shorewall, vous devriez regarder l'adresse de votre interface Avant de lancer Shorewall, vous devriez regarder l'adresse de votre interface
externe et si elle est comprise dans une des plages précédentes, vous devriez externe et si elle est comprise dans une des plages précédentes, vous devriez
enlever l'option 'norfc1918' dans le fichier /etc/shorewall/interfaces.</p> enlever l'option 'norfc1918' dans le fichier /etc/shorewall/interfaces.</p>
</div> </div>
<div align="left"> <div align="left">
@ -274,7 +275,7 @@ enlever l'option 'norfc1918' dans le fichier /etc/shorewall/interfaces.</p>
<div align="left"> <div align="left">
<p align="left">Si vous désirez autoriser d'autres connexions depuis l'Internet <p align="left">Si vous désirez autoriser d'autres connexions depuis l'Internet
vers votre firewall, le format général est :</p> vers votre firewall, le format général est :</p>
</div> </div>
<div align="left"> <div align="left">
@ -309,8 +310,8 @@ vers votre firewall, le format g
</div> </div>
<div align="left"> <div align="left">
<p align="left">Exemple - Vous voulez faire tourner un serveur Web et un serveur <p align="left">Exemple - Vous voulez faire tourner un serveur Web et un
POP3 sur votre système de firewall :</p> serveur POP3 sur votre système de firewall :</p>
</div> </div>
<div align="left"> <div align="left">
@ -357,14 +358,14 @@ POP3 sur votre syst
<div align="left"> <div align="left">
<p align="left">Si vous ne savez pas quel port ou protocole une application <p align="left">Si vous ne savez pas quel port ou protocole une application
particulière utilise, regardez <a href="ports.htm">ici</a>.</p> particulière utilise, regardez <a href="ports.htm">ici</a>.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left"><b>Important: </b>Je ne vous recommande pas d'autoriser le <p align="left"><b>Important: </b>Je ne vous recommande pas d'autoriser le
telnet depuis ou vers l'Internet car il utilise du texte en clair (même pour telnet depuis ou vers l'Internet car il utilise du texte en clair (même
le login et le mot de passe !). Si vous voulez avoir un accès au shell de pour le login et le mot de passe !). Si vous voulez avoir un accès au shell
votre firewall depuis Internet, utilisez SSH :</p> de votre firewall depuis Internet, utilisez SSH :</p>
</div> </div>
<div align="left"> <div align="left">
@ -406,7 +407,7 @@ votre firewall depuis Internet, utilisez SSH :</p>
<p align="left"><img border="0" src="images/BD21298_3.gif" width="13" <p align="left"><img border="0" src="images/BD21298_3.gif" width="13"
height="13"> height="13">
A ce point, éditez /etc/shorewall/rules pour rajouter les autres connexions A ce point, éditez /etc/shorewall/rules pour rajouter les autres connexions
désirées.</p> désirées.</p>
</div> </div>
<div align="left"> <div align="left">
@ -419,33 +420,33 @@ d
La <a href="Install.htm">procédure d'installation </a> configure votre La <a href="Install.htm">procédure d'installation </a> configure votre
système pour lancer Shorewall au boot du système, mais au début avec la version système pour lancer Shorewall au boot du système, mais au début avec la version
1.3.9 de Shorewall le lancement est désactivé, n'essayer pas de lancer Shorewall 1.3.9 de Shorewall le lancement est désactivé, n'essayer pas de lancer Shorewall
avec que la configuration soit finie. Une fois que vous en aurez fini avec avec que la configuration soit finie. Une fois que vous en aurez fini avec
la configuration du firewall, vous pouvez permettre le lancement de Shorewall la configuration du firewall, vous pouvez permettre le lancement de Shorewall
en supprimant le fichier /etc/shorewall/startup_disabled.<br> en supprimant le fichier /etc/shorewall/startup_disabled.<br>
</p> </p>
<p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Les utilisateurs des <p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Les utilisateurs
paquets .deb doivent éditer /etc/default/shorewall et mettre 'startup=1'.</font><br> des paquets .deb doivent éditer /etc/default/shorewall et mettre 'startup=1'.</font><br>
</p> </p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">Le firewall est activé en utilisant la commande "shorewall <p align="left">Le firewall est activé en utilisant la commande "shorewall
start" et arrêté avec "shorewall stop". Lorsque le firewall est stoppé, le start" et arrêté avec "shorewall stop". Lorsque le firewall est stoppé,
routage est autorisé sur les hôtes qui possèdent une entrée dans <a le routage est autorisé sur les hôtes qui possèdent une entrée dans <a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un
firewall qui tourne peut être relancé en utilisant la commande "shorewall firewall qui tourne peut être relancé en utilisant la commande "shorewall
restart". Si vous voulez enlever toutes traces de Shorewall sur votre configuration restart". Si vous voulez enlever toutes traces de Shorewall sur votre
de Netfilter, utilisez "shorewall clear".</p> configuration de Netfilter, utilisez "shorewall clear".</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left"><b>ATTENTION: </b>Si vous êtes connecté à votre firewall depuis <p align="left"><b>ATTENTION: </b>Si vous êtes connecté à votre firewall
Internet, n'essayez pas une commande "shorewall stop" tant que vous n'avez depuis Internet, n'essayez pas une commande "shorewall stop" tant que vous
pas ajouté une entrée pour votre adresse IP (celle à partir de laquelle vous n'avez pas ajouté une entrée pour votre adresse IP (celle à partir de laquelle
êtes connectée) dans <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. vous êtes connectée) dans <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
De la même manière, je ne vous recommande pas d'utiliser "shorewall restart"; De la même manière, je ne vous recommande pas d'utiliser "shorewall restart";
il est plus intéressant de créer une <i><a il est plus intéressant de créer une <i><a
href="configuration_file_basics.htm#Configs">configuration alternative</a></i> href="configuration_file_basics.htm#Configs">configuration alternative</a></i>
et de la tester en utilisant la commande <a et de la tester en utilisant la commande <a
href="starting_and_stopping_shorewall.htm">"shorewall try"</a>.</p> href="starting_and_stopping_shorewall.htm">"shorewall try"</a>.</p>
@ -455,7 +456,8 @@ il est plus int
href="support.htm">Tom Eastep</a></font></p> href="support.htm">Tom Eastep</a></font></p>
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002 Thomas <p align="left"><a href="copyright.htm"><font size="2">Copyright 2002 Thomas
M. Eastep</font></a></p> M. Eastep</font></a></p>
<br>
<br> <br>
<br> <br>
<br> <br>

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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -30,21 +30,21 @@
<p> If you have a permanent internet connection such as DSL or Cable, <p> If you have a permanent internet connection such as DSL or Cable,
I recommend that you start the firewall automatically at boot. I recommend that you start the firewall automatically at boot.
Once you have installed "firewall" in your init.d directory, simply Once you have installed "firewall" in your init.d directory, simply
type "chkconfig --add firewall". This will start the firewall type "chkconfig --add firewall". This will start the firewall
in run levels 2-5 and stop it in run levels 1 and 6. If you want to in run levels 2-5 and stop it in run levels 1 and 6. If you want
configure your firewall differently from this default, you can use to configure your firewall differently from this default, you can
the "--level" option in chkconfig (see "man chkconfig") or using your use the "--level" option in chkconfig (see "man chkconfig") or using
favorite graphical run-level editor.</p> your favorite graphical run-level editor.</p>
<p><strong><u> <font color="#000099"> Important Notes:</font></u></strong><br> <p><strong><u> <font color="#000099"> Important Notes:</font></u></strong><br>
</p> </p>
<ol> <ol>
<li>Shorewall startup is disabled by default. Once you have <li>Shorewall startup is disabled by default. Once you have
configured your firewall, you can enable startup by removing the file configured your firewall, you can enable startup by removing the file
/etc/shorewall/startup_disabled. Note: Users of the .deb package must /etc/shorewall/startup_disabled. Note: Users of the .deb package must
edit /etc/default/shorewall and set 'startup=1'.<br> edit /etc/default/shorewall and set 'startup=1'.<br>
</li> </li>
<li>If you use dialup, you may want to start the firewall <li>If you use dialup, you may want to start the firewall
in your /etc/ppp/ip-up.local script. I recommend just placing "shorewall in your /etc/ppp/ip-up.local script. I recommend just placing "shorewall
@ -64,8 +64,8 @@ edit /etc/default/shorewall and set 'startup=1'.<br>
running) and then starts it again</li> running) and then starts it again</li>
<li>shorewall reset - reset the packet and byte counters <li>shorewall reset - reset the packet and byte counters
in the firewall</li> in the firewall</li>
<li>shorewall clear - remove all rules and chains installed <li>shorewall clear - remove all rules and chains
by Shoreline Firewall</li> installed by Shoreline Firewall</li>
<li>shorewall refresh - refresh the rules involving the <li>shorewall refresh - refresh the rules involving the
broadcast addresses of firewall interfaces, <a broadcast addresses of firewall interfaces, <a
href="blacklisting_support.htm">the black list</a>, <a href="blacklisting_support.htm">the black list</a>, <a
@ -73,13 +73,13 @@ broadcast addresses of firewall interfaces, <a
href="ECN.html">ECN control rules</a>.</li> href="ECN.html">ECN control rules</a>.</li>
</ul> </ul>
If you include the keyword <i>debug</i> as the first argument, then If you include the keyword <i>debug</i> as the first argument,
a shell trace of the command is produced as in:<br> then a shell trace of the command is produced as in:<br>
<pre> <font color="#009900"><b>shorewall debug start 2&gt; /tmp/trace</b></font><br></pre> <pre> <font color="#009900"><b>shorewall debug start 2&gt; /tmp/trace</b></font><br></pre>
<p>The above command would trace the 'start' command and place the trace information <p>The above command would trace the 'start' command and place the trace
in the file /tmp/trace<br> information in the file /tmp/trace<br>
</p> </p>
<p>The <a href="#StateDiagram">Shorewall State Diagram</a> is shown at the <p>The <a href="#StateDiagram">Shorewall State Diagram</a> is shown at the
@ -90,7 +90,7 @@ in the file /tmp/trace<br>
<ul> <ul>
<li>shorewall status - produce a verbose report about the <li>shorewall status - produce a verbose report about the
firewall (iptables -L -n -v)</li> firewall (iptables -L -n -v)</li>
<li>shorewall show <i>chain</i> - produce a verbose report <li>shorewall show <i>chain</i> - produce a verbose report
about <i>chain </i>(iptables -L <i>chain</i> -n -v)</li> about <i>chain </i>(iptables -L <i>chain</i> -n -v)</li>
<li>shorewall show nat - produce a verbose report about <li>shorewall show nat - produce a verbose report about
@ -101,44 +101,46 @@ the mangle table (iptables -t mangle -L -n -v)</li>
entries.</li> entries.</li>
<li>shorewall show connections - displays the IP connections <li>shorewall show connections - displays the IP connections
currently being tracked by the firewall.</li> currently being tracked by the firewall.</li>
<li>shorewall show <li>shorewall
tc - displays show tc - displays
information about the traffic control/shaping configuration.</li> information about the traffic control/shaping configuration.</li>
<li>shorewall monitor [ delay ] - Continuously display the <li>shorewall monitor [ delay ] - Continuously display
firewall status, last 20 log entries and nat. When the log the firewall status, last 20 log entries and nat. When the
entry display changes, an audible alarm is sounded.</li> log entry display changes, an audible alarm is sounded.</li>
<li>shorewall hits - Produces several reports about the <li>shorewall hits - Produces several reports about the
Shorewall packet log messages in the current /var/log/messages Shorewall packet log messages in the current /var/log/messages
file.</li> file.</li>
<li>shorewall version - Displays the installed version <li>shorewall version - Displays the installed version
number.</li> number.</li>
<li>shorewall check - Performs a <u>cursory</u> validation of the <li>shorewall check - Performs a <u>cursory</u> validation of
zones, interfaces, hosts, rules and policy files.<br> the zones, interfaces, hosts, rules and policy files.<br>
<br> <br>
<font size="4" color="#ff6666"><b>The "check" command is totally unsuppored <font size="4" color="#ff6666"><b>The "check" command is totally unsuppored
and does not parse and validate the generated iptables commands. and does not parse and validate the generated iptables commands.
Even though the "check" command completes successfully, the configuration Even though the "check" command completes successfully, the configuration
may fail to start. Problem reports that complain about errors that the 'check' may fail to start. Problem reports that complain about errors that the 'check'
command does not detect will not be accepted.<br> command does not detect will not be accepted.<br>
<br> <br>
See the recommended way to make configuration changes described below.</b></font><br> See the recommended way to make configuration changes described
below.</b></font><br>
<br> <br>
</li> </li>
<li>shorewall try<i> configuration-directory</i> [<i> timeout</i> <li>shorewall try<i> configuration-directory</i> [<i> timeout</i>
] - Restart shorewall using the specified configuration and if ] - Restart shorewall using the specified configuration and if
an error occurs or if the<i> timeout </i> option is given and the an error occurs or if the<i> timeout </i> option is given and the new
new configuration has been up for that many seconds then shorewall configuration has been up for that many seconds then shorewall is
is restarted using the standard configuration.</li> restarted using the standard configuration.</li>
<li>shorewall deny, shorewall reject, shorewall accept and <li>shorewall deny, shorewall reject, shorewall accept
shorewall save implement <a href="blacklisting_support.htm">dynamic and shorewall save implement <a
blacklisting</a>.</li> href="blacklisting_support.htm">dynamic blacklisting</a>.</li>
<li>shorewall logwatch (added in version 1.3.2) - Monitors <li>shorewall logwatch (added in version 1.3.2) - Monitors
the <a href="#Conf">LOGFILE </a>and produces an audible alarm when the <a href="#Conf">LOGFILE </a>and produces an audible alarm
new Shorewall messages are logged.</li> when new Shorewall messages are logged.</li>
</ul> </ul>
Beginning with Shorewall 1.4.6, /sbin/shorewall supports a couple of commands Beginning with Shorewall 1.4.6, /sbin/shorewall supports a couple of commands
for dealing with IP addresses and IP address ranges:<br> for dealing with IP addresses and IP address ranges:<br>
<ul> <ul>
<li>shorewall ipcalc [ <i>address mask </i>| <i>address/vlsm</i> ] - displays <li>shorewall ipcalc [ <i>address mask </i>| <i>address/vlsm</i> ] - displays
the network address, broadcast address, network in CIDR notation and netmask the network address, broadcast address, network in CIDR notation and netmask
@ -147,13 +149,15 @@ corresponding to the input[s].</li>
range of IP addresses into the equivalent list of network/host addresses. range of IP addresses into the equivalent list of network/host addresses.
<br> <br>
</li> </li>
</ul> </ul>
Finally, the "shorewall" program may be used to dynamically alter the Finally, the "shorewall" program may be used to dynamically alter the
contents of a zone.<br> contents of a zone.<br>
<ul> <ul>
<li>shorewall add <i>interface</i>[:<i>host]</i> <i>zone </i>- <li>shorewall add <i>interface</i>[:<i>host]</i> <i>zone </i>-
Adds the specified interface (and host if included) to the specified zone.</li> Adds the specified interface (and host if included) to the specified
zone.</li>
<li>shorewall delete <i>interface</i>[:<i>host]</i> <i>zone <li>shorewall delete <i>interface</i>[:<i>host]</i> <i>zone
</i>- Deletes the specified interface (and host if included) from </i>- Deletes the specified interface (and host if included) from
the specified zone.</li> the specified zone.</li>
@ -165,8 +169,8 @@ the specified zone.</li>
<blockquote><font color="#009900"><b>shorewall add ipsec0:192.0.2.24 vpn1</b></font> <blockquote><font color="#009900"><b>shorewall add ipsec0:192.0.2.24 vpn1</b></font>
-- adds the address 192.0.2.24 from interface ipsec0 to the zone vpn1<br> -- adds the address 192.0.2.24 from interface ipsec0 to the zone vpn1<br>
<font color="#009900"><b> shorewall delete ipsec0:192.0.2.24 <font color="#009900"><b> shorewall delete ipsec0:192.0.2.24
vpn1</b></font> -- deletes the address 192.0.2.24 from interface ipsec0 vpn1</b></font> -- deletes the address 192.0.2.24 from interface ipsec0
from zone vpn1<br> from zone vpn1<br>
</blockquote> </blockquote>
</blockquote> </blockquote>
@ -182,9 +186,9 @@ from zone vpn1<br>
<p> If a <i>configuration-directory</i> is specified, each time that Shorewall <p> If a <i>configuration-directory</i> is specified, each time that Shorewall
is going to use a file in /etc/shorewall it will first look in the is going to use a file in /etc/shorewall it will first look in the
<i>configuration-directory</i> . If the file is present in the <i>configuration-directory</i>, <i>configuration-directory</i> . If the file is present in the <i>configuration-directory</i>,
that file will be used; otherwise, the file in /etc/shorewall will be that file will be used; otherwise, the file in /etc/shorewall will
used.</p> be used.</p>
<p> When changing the configuration of a production firewall, I recommend <p> When changing the configuration of a production firewall, I recommend
the following:</p> the following:</p>
@ -202,8 +206,9 @@ from /etc/shorewall to . and change them here&gt;</li>
</ul> </ul>
<p> If the configuration starts but doesn't work, just "shorewall restart" <p> If the configuration starts but doesn't work, just "shorewall restart"
to restore the old configuration. If the new configuration fails to to restore the old configuration. If the new configuration fails
start, the "try" command will automatically start the old one for you.</p> to start, the "try" command will automatically start the old one for
you.</p>
<p> When the new configuration works then just </p> <p> When the new configuration works then just </p>
@ -225,8 +230,8 @@ from /etc/shorewall to . and change them here&gt;</li>
<p>  <br> <p>  <br>
</p> </p>
You will note that the commands that result in state transitions You will note that the commands that result in state transitions
use the word "firewall" rather than "shorewall". That is because the actual use the word "firewall" rather than "shorewall". That is because the
transitions are done by /usr/lib/shorewall/firewall (/usr/share/shorewall/firewall actual transitions are done by /usr/lib/shorewall/firewall (/usr/share/shorewall/firewall
on Debian); /sbin/shorewall runs 'firewall" according to the following on Debian); /sbin/shorewall runs 'firewall" according to the following
table:<br> table:<br>
<br> <br>
@ -290,5 +295,6 @@ table:<br>
</p> </p>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

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@ -12,15 +12,17 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td
width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Shorewall Support Guide<img <h1 align="center"><font color="#ffffff">Shorewall Support Guide<img
src="images/obrasinf.gif" alt="" width="90" height="90" align="middle"> src="images/obrasinf.gif" alt="" width="90" height="90" align="middle">
</font></h1> </font></h1>
</td> </td>
</tr> </tr>
@ -30,11 +32,11 @@
<h2>Before Reporting a Problem or Asking a Question<br> <h2>Before Reporting a Problem or Asking a Question<br>
</h2> </h2>
There are a number of sources of Shorewall information. Please There are a number of sources of Shorewall information. Please
try these before you post. try these before you post.
<ul> <ul>
<li>Shorewall versions <li>Shorewall versions
earlier that 1.3.0 are no longer supported.<br> earlier that 1.3.0 are no longer supported.<br>
</li> </li>
<li>More than half of the questions posted on the support <li>More than half of the questions posted on the support
list have answers directly accessible from the <a list have answers directly accessible from the <a
@ -48,13 +50,13 @@ earlier that 1.3.0 are no longer supported.<br>
<li> <li>
The <a href="http://www.shorewall.net/troubleshoot.htm">Troubleshooting</a> The <a href="http://www.shorewall.net/troubleshoot.htm">Troubleshooting</a>
Information contains a number of tips to Information contains a number of tips to
help you solve common problems. </li> help you solve common problems. </li>
<li> <li>
The <a href="http://www.shorewall.net/errata.htm"> Errata</a> The <a href="http://www.shorewall.net/errata.htm"> Errata</a>
has links to download updated components. </li> has links to download updated components. </li>
<li> <li>
The Site and Mailing List Archives search facility can The Site and Mailing List Archives search facility can
locate documents and posts about similar problems: locate documents and posts about similar problems:
</li> </li>
</ul> </ul>
@ -105,28 +107,28 @@ locate documents and posts about similar problems:
</h2> </h2>
<ul> <ul>
<li>Please remember we only know <li>Please remember we only
what is posted in your message. Do not leave out any information know what is posted in your message. Do not leave out any
that appears to be correct, or was mentioned in a previous information that appears to be correct, or was mentioned
post. There have been countless posts by people who were sure in a previous post. There have been countless posts by people
that some part of their configuration was correct when it actually who were sure that some part of their configuration was correct
contained a small error. We tend to be skeptics where detail when it actually contained a small error. We tend to be skeptics
is lacking.<br> where detail is lacking.<br>
<br> <br>
</li> </li>
<li>Please keep in mind that <li>Please keep in mind that
you're asking for <strong>free</strong> technical you're asking for <strong>free</strong> technical
support. Any help we offer is an act of generosity, not an obligation. support. Any help we offer is an act of generosity, not an obligation.
Try to make it easy for us to help you. Follow good, courteous Try to make it easy for us to help you. Follow good, courteous
practices in writing and formatting your e-mail. Provide details that practices in writing and formatting your e-mail. Provide details
we need if you expect good answers. <em>Exact quoting </em> of that we need if you expect good answers. <em>Exact quoting </em>
error messages, log entries, command output, and other output is better of error messages, log entries, command output, and other output is
than a paraphrase or summary.<br> better than a paraphrase or summary.<br>
<br> <br>
</li> </li>
<li> <li>
Please don't describe your environment and then Please don't describe your environment and then
ask us to send you custom configuration files. ask us to send you custom configuration files.
We're here to answer your questions but we can't We're here to answer your questions but we can't
do your job for you.<br> do your job for you.<br>
<br> <br>
@ -142,8 +144,8 @@ ask us to send you custom configuration files.
<li>the exact version of Shorewall <li>the exact version of Shorewall
you are running.<br> you are running.<br>
<br> <br>
<b><font color="#009900">shorewall <b><font
version</font><br> color="#009900">shorewall version</font><br>
</b> <br> </b> <br>
</li> </li>
@ -186,8 +188,8 @@ ask us to send you custom configuration files.
<ul> <ul>
<li><big><font color="#ff0000"><u><i><big><b>THIS IS <li><big><font color="#ff0000"><u><i><big><b>THIS IS
IMPORTANT!</b></big></i></u></font><big><big><big> </big>If your problem IMPORTANT!</b></big></i></u></font><big><big><big> </big>If your problem is
is that some type of connection to/from or through your firewall isn't working that some type of connection to/from or through your firewall isn't working
then please perform the following four steps:</big></big></big><br> then please perform the following four steps:</big></big></big><br>
<br> <br>
1. <b><font color="#009900">/sbin/shorewall reset</font></b><br> 1. <b><font color="#009900">/sbin/shorewall reset</font></b><br>
@ -216,12 +218,12 @@ then please perform the following four steps:</big></big></big><br>
</ul> </ul>
<li>As a general matter, please <strong>do not edit the diagnostic <li>As a general matter, please <strong>do not edit the
information</strong> in an attempt to conceal your IP address, diagnostic information</strong> in an attempt to conceal
netmask, nameserver addresses, domain name, etc. These aren't your IP address, netmask, nameserver addresses, domain name,
secrets, and concealing them often misleads us (and 80% of the time, etc. These aren't secrets, and concealing them often misleads us
a hacker could derive them anyway from information contained (and 80% of the time, a hacker could derive them anyway from
in the SMTP headers of your post).<br> information contained in the SMTP headers of your post).<br>
<br> <br>
<strong></strong></li> <strong></strong></li>
<li>Do you see any "Shorewall" messages <li>Do you see any "Shorewall" messages
@ -239,16 +241,17 @@ your /etc/shorewall/interfaces file.<br>
one also knows the policies).<br> one also knows the policies).<br>
<br> <br>
</li> </li>
<li>If an error occurs when you try to <li>If an error occurs when you try
"<font color="#009900"><b>shorewall start</b></font>", include to "<font color="#009900"><b>shorewall start</b></font>", include
a trace (See the <a a trace (See the <a
href="http://www.shorewall.net/troubleshoot.htm">Troubleshooting</a> href="http://www.shorewall.net/troubleshoot.htm">Troubleshooting</a>
section for instructions).<br> section for instructions).<br>
<br> <br>
</li> </li>
<li><b>The list server limits posts to 120kb so <li><b>The list server limits posts to 120kb
don't post GIFs of your network layout, so don't post GIFs of your network
etc. to the Mailing List -- your post will be rejected.</b></li> layout, etc. to the Mailing List -- your post will be
rejected.</b></li>
</ul> </ul>
@ -260,25 +263,25 @@ your /etc/shorewall/interfaces file.<br>
<h2>When using the mailing list, please post in plain text</h2> <h2>When using the mailing list, please post in plain text</h2>
<blockquote> A growing number of MTAs serving list subscribers are rejecting <blockquote> A growing number of MTAs serving list subscribers are
all HTML traffic. At least one MTA has gone so far as to blacklist rejecting all HTML traffic. At least one MTA has gone so far as to
shorewall.net "for continuous abuse" because it has been my policy blacklist shorewall.net "for continuous abuse" because it has been
to allow HTML in list posts!!<br> my policy to allow HTML in list posts!!<br>
<br> <br>
I think that blocking all I think that blocking all
HTML is a Draconian way to control spam and that the HTML is a Draconian way to control spam and that the ultimate
ultimate losers here are not the spammers but the list subscribers losers here are not the spammers but the list subscribers
whose MTAs are bouncing all shorewall.net mail. As one list whose MTAs are bouncing all shorewall.net mail. As one list
subscriber wrote to me privately "These e-mail admin's need subscriber wrote to me privately "These e-mail admin's need
to get a <i>(expletive deleted)</i> life instead of trying to rid to get a <i>(expletive deleted)</i> life instead of trying to
the planet of HTML based e-mail". Nevertheless, to allow subscribers rid the planet of HTML based e-mail". Nevertheless, to allow
to receive list posts as must as possible, I have now configured subscribers to receive list posts as must as possible, I have now
the list server at shorewall.net to strip all HTML from outgoing configured the list server at shorewall.net to strip all HTML from
posts.<br> outgoing posts.<br>
<br> <br>
<big><font color="#cc0000"><b>If you run your own outgoing mail server <big><font color="#cc0000"><b>If you run your own outgoing mail server
and it doesn't have a valid DNS PTR record, your email won't reach the lists and it doesn't have a valid DNS PTR record, your email won't reach the
unless/until the postmaster notices that your posts are being rejected. lists unless/until the postmaster notices that your posts are being rejected.
To avoid this problem, you should configure your MTA to forward posts to To avoid this problem, you should configure your MTA to forward posts to
shorewall.net through an MTA that <u>does</u> have a valid PTR record (such shorewall.net through an MTA that <u>does</u> have a valid PTR record (such
as the one at your ISP). </b></font></big><br> as the one at your ISP). </b></font></big><br>
@ -317,6 +320,7 @@ as the one at your ISP). </b></font></big><br>
<p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font <p align="left"><font face="Trebuchet MS"><a href="copyright.htm"> <font
size="2">Copyright</font> © <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br> size="2">Copyright</font> © <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br>
</p> </p>
<br>
</body> </body>
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@ -16,10 +16,11 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber5" bgcolor="#400169" height="90"> id="AutoNumber5" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Three-Interface Firewall</font></h1> <h1 align="center"><font color="#ffffff">Three-Interface Firewall</font></h1>
</td> </td>
</tr> </tr>
@ -43,7 +44,7 @@
<li>Single public IP address.</li> <li>Single public IP address.</li>
<li>DMZ connected to a separate ethernet interface.</li> <li>DMZ connected to a separate ethernet interface.</li>
<li>Connection through DSL, Cable Modem, ISDN, Frame <li>Connection through DSL, Cable Modem, ISDN, Frame
Relay, dial-up, ...</li> Relay, dial-up, ...</li>
</ul> </ul>
@ -56,16 +57,16 @@ Relay, dial-up, ...</li>
<p>Shorewall requires that you have the iproute/iproute2 package installed <p>Shorewall requires that you have the iproute/iproute2 package installed
(on RedHat, the package is called <i>iproute</i>)<i>. </i>You can (on RedHat, the package is called <i>iproute</i>)<i>. </i>You can
tell if this package is installed by the presence of an <b>ip</b> tell if this package is installed by the presence of an <b>ip</b>
program on your firewall system. As root, you can use the 'which' program on your firewall system. As root, you can use the 'which' command
command to check for this program:</p> to check for this program:</p>
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre> <pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
<p>I recommend that you first read through the guide to familiarize yourself <p>I recommend that you first read through the guide to familiarize yourself
with what's involved then go back through it again making your with what's involved then go back through it again making your configuration
configuration changes. Points at which configuration changes are changes. Points at which configuration changes are recommended
recommended are flagged with <img border="0" are flagged with <img border="0" src="images/BD21298_.gif"
src="images/BD21298_.gif" width="13" height="13"> width="13" height="13">
. Configuration notes that are unique to LEAF/Bering are marked with <img . Configuration notes that are unique to LEAF/Bering are marked with <img
src="images/leaflogo.gif" alt="(LEAF Logo)" width="49" height="36"> src="images/leaflogo.gif" alt="(LEAF Logo)" width="49" height="36">
</p> </p>
@ -75,16 +76,16 @@ configuration changes. Points at which configuration changes are
system, you must save them as Unix files if your editor supports system, you must save them as Unix files if your editor supports
that option or you must run them through dos2unix before trying to that option or you must run them through dos2unix before trying to
use them. Similarly, if you copy a configuration file from your Windows use them. Similarly, if you copy a configuration file from your Windows
hard drive to a floppy disk, you must run dos2unix against the copy hard drive to a floppy disk, you must run dos2unix against the copy before
before using it with Shorewall.</p> using it with Shorewall.</p>
<ul> <ul>
<li><a <li><a
href="http://www.simtel.net/pub/pd/51438.html">Windows Version of href="http://www.simtel.net/pub/pd/51438.html">Windows Version of
dos2unix</a></li> dos2unix</a></li>
<li><a <li><a
href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version of
of dos2unix</a></li> dos2unix</a></li>
</ul> </ul>
@ -94,8 +95,8 @@ of dos2unix</a></li>
alt=""> alt="">
    The configuration files for Shorewall are contained in the     The configuration files for Shorewall are contained in the
directory /etc/shorewall -- for simple setups, you will only need to directory /etc/shorewall -- for simple setups, you will only need to
deal with a few of these as described in this guide. After you have deal with a few of these as described in this guide. After you have <a
<a href="Install.htm">installed Shorewall</a>, <b>download the <a href="Install.htm">installed Shorewall</a>, <b>download the <a
href="http://www.shorewall.net/pub/shorewall/Samples/">three-interface href="http://www.shorewall.net/pub/shorewall/Samples/">three-interface
sample</a>, un-tar it (tar -zxvf three-interfaces.tgz) and and copy sample</a>, un-tar it (tar -zxvf three-interfaces.tgz) and and copy
the files to /etc/shorewall (the files will replace files with the the files to /etc/shorewall (the files will replace files with the
@ -152,8 +153,8 @@ in the <a href="Documentation.htm#Rules">/etc/shorewall/rules </a>file.<
<p>For each connection request entering the firewall, the request is first <p>For each connection request entering the firewall, the request is first
checked against the /etc/shorewall/rules file. If no rule in that checked against the /etc/shorewall/rules file. If no rule in that
file matches the connection request then the first policy in /etc/shorewall/policy file matches the connection request then the first policy in /etc/shorewall/policy
that matches the request is applied. If that policy is REJECT that matches the request is applied. If that policy is REJECT or
or DROP  the request is first checked against the rules in /etc/shorewall/common DROP  the request is first checked against the rules in /etc/shorewall/common
(the samples provide that file for you).</p> (the samples provide that file for you).</p>
<p>The /etc/shorewall/policy file included with the three-interface sample <p>The /etc/shorewall/policy file included with the three-interface sample
@ -228,10 +229,11 @@ or DROP
<ol> <ol>
<li>allow all connection requests from your local network <li>allow all connection requests from your local network
to the internet</li> to the internet</li>
<li>drop (ignore) all connection requests from the internet <li>drop (ignore) all connection requests from the
to your firewall or local network</li> internet to your firewall or local network</li>
<li>optionally accept all connection requests from the <li>optionally accept all connection requests from
firewall to the internet (if you uncomment the additional policy)</li> the firewall to the internet (if you uncomment the additional
policy)</li>
<li>reject all other connection requests.</li> <li>reject all other connection requests.</li>
</ol> </ol>
@ -248,8 +250,8 @@ or DROP
<p align="left">The firewall has three network interfaces. Where Internet <p align="left">The firewall has three network interfaces. Where Internet
connectivity is through a cable or DSL "Modem", the <i>External connectivity is through a cable or DSL "Modem", the <i>External
Interface</i> will be the ethernet adapter that is connected to Interface</i> will be the ethernet adapter that is connected to that
that "Modem" (e.g., <b>eth0</b>)  <u>unless</u> you connect via <i><u>P</u>oint-to-<u>P</u>oint "Modem" (e.g., <b>eth0</b>)  <u>unless</u> you connect via <i><u>P</u>oint-to-<u>P</u>oint
<u>P</u>rotocol over <u>E</u>thernet</i> (PPPoE) or <i><u>P</u>oint-to-<u>P</u>oint <u>P</u>rotocol over <u>E</u>thernet</i> (PPPoE) or <i><u>P</u>oint-to-<u>P</u>oint
<u>T</u>unneling <u>P</u>rotocol </i>(PPTP) in which case the External <u>T</u>unneling <u>P</u>rotocol </i>(PPTP) in which case the External
Interface will be a ppp interface (e.g., <b>ppp0</b>). If you connect Interface will be a ppp interface (e.g., <b>ppp0</b>). If you connect
@ -265,13 +267,13 @@ that "Modem" (e.g., <b>eth0</b>)
<p align="left">Your <i>Local Interface</i> will be an ethernet adapter (eth0, <p align="left">Your <i>Local Interface</i> will be an ethernet adapter (eth0,
eth1 or eth2) and will be connected to a hub or switch. Your local eth1 or eth2) and will be connected to a hub or switch. Your local
computers will be connected to the same switch (note: If you have computers will be connected to the same switch (note: If you have
only a single local system, you can connect the firewall directly only a single local system, you can connect the firewall directly to
to the computer using a <i>cross-over </i> cable).</p> the computer using a <i>cross-over </i> cable).</p>
<p align="left">Your <i>DMZ Interface</i> will also be an ethernet adapter <p align="left">Your <i>DMZ Interface</i> will also be an ethernet adapter
(eth0, eth1 or eth2) and will be connected to a hub or switch. (eth0, eth1 or eth2) and will be connected to a hub or switch. Your
Your DMZ computers will be connected to the same switch (note: If DMZ computers will be connected to the same switch (note: If you
you have only a single DMZ system, you can connect the firewall directly have only a single DMZ system, you can connect the firewall directly
to the computer using a <i>cross-over </i> cable).</p> to the computer using a <i>cross-over </i> cable).</p>
<p align="left"><u><b> <img border="0" src="images/j0213519.gif" <p align="left"><u><b> <img border="0" src="images/j0213519.gif"
@ -307,18 +309,18 @@ list of options that are specified for the interfaces. Some hints:</p>
<h2 align="left">IP Addresses</h2> <h2 align="left">IP Addresses</h2>
<p align="left">Before going further, we should say a few words about Internet <p align="left">Before going further, we should say a few words about Internet
Protocol (IP) <i>addresses</i>. Normally, your ISP will assign Protocol (IP) <i>addresses</i>. Normally, your ISP will assign you
you a single <i> Public</i> IP address. This address may be assigned a single <i> Public</i> IP address. This address may be assigned via
via the<i> Dynamic Host Configuration Protocol</i> (DHCP) or as part the<i> Dynamic Host Configuration Protocol</i> (DHCP) or as part of
of establishing your connection when you dial in (standard modem) or establishing your connection when you dial in (standard modem) or establish
establish your PPP connection. In rare cases, your ISP may assign you your PPP connection. In rare cases, your ISP may assign you a<i> static</i>
a<i> static</i> IP address; that means that you configure your firewall's IP address; that means that you configure your firewall's external interface
external interface to use that address permanently.<i> </i>Regardless to use that address permanently.<i> </i>Regardless of how the address
of how the address is assigned, it will be shared by all of your systems is assigned, it will be shared by all of your systems when you access
when you access the Internet. You will have to assign your own addresses the Internet. You will have to assign your own addresses for your internal
for your internal network (the local and DMZ Interfaces on your firewall network (the local and DMZ Interfaces on your firewall plus your other
plus your other computers). RFC 1918 reserves several <i>Private </i>IP computers). RFC 1918 reserves several <i>Private </i>IP address ranges
address ranges for this purpose:</p> for this purpose:</p>
<div align="left"> <div align="left">
<pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre> <pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre>
@ -328,16 +330,16 @@ address ranges for this purpose:</p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
    Before starting Shorewall, you should look at the     Before starting Shorewall, you should look at the
IP address of your external interface and if it is one of the IP address of your external interface and if it is one of the above
above ranges, you should remove the 'norfc1918' option from the ranges, you should remove the 'norfc1918' option from the external
external interface's entry in /etc/shorewall/interfaces.</p> interface's entry in /etc/shorewall/interfaces.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">You will want to assign your local addresses from one <i> <p align="left">You will want to assign your local addresses from one <i>
sub-network </i>or <i>subnet</i> and your DMZ addresses from another sub-network </i>or <i>subnet</i> and your DMZ addresses from another
subnet. For our purposes, we can consider a subnet to consists subnet. For our purposes, we can consider a subnet to consists of
of a range of addresses x.y.z.0 - x.y.z.255. Such a subnet will have a range of addresses x.y.z.0 - x.y.z.255. Such a subnet will have
a <i>Subnet Mask </i>of 255.255.255.0. The address x.y.z.0 is reserved a <i>Subnet Mask </i>of 255.255.255.0. The address x.y.z.0 is reserved
as the <i>Subnet Address</i> and x.y.z.255 is reserved as the <i>Subnet as the <i>Subnet Address</i> and x.y.z.255 is reserved as the <i>Subnet
Broadcast</i> <i>Address</i>. In Shorewall, a subnet is described using <a Broadcast</i> <i>Address</i>. In Shorewall, a subnet is described using <a
@ -394,19 +396,19 @@ from the left of the subnet mask. </p>
<div align="left"> <div align="left">
<p align="left"><img border="0" src="images/BD21298_1.gif" width="13" <p align="left"><img border="0" src="images/BD21298_1.gif" width="13"
height="13"> height="13">
    Your local computers (Local Computers 1 &amp; 2)     Your local computers (Local Computers 1 &amp;
should be configured with their<i> default gateway</i> set to 2) should be configured with their<i> default gateway</i> set
the IP address of the firewall's internal interface and your DMZ to the IP address of the firewall's internal interface and your
computers ( DMZ Computers 1 &amp; 2) should be configured with their DMZ computers ( DMZ Computers 1 &amp; 2) should be configured with
default gateway set to the IP address of the firewall's DMZ interface.   their default gateway set to the IP address of the firewall's DMZ
</p> interface.   </p>
</div> </div>
<p align="left">The foregoing short discussion barely scratches the surface <p align="left">The foregoing short discussion barely scratches the surface
regarding subnetting and routing. If you are interested in learning regarding subnetting and routing. If you are interested in learning
more about IP addressing and routing, I highly recommend <i>"IP more about IP addressing and routing, I highly recommend <i>"IP Fundamentals:
Fundamentals: What Everyone Needs to Know about Addressing &amp; What Everyone Needs to Know about Addressing &amp; Routing",</i>
Routing",</i> Thomas A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.</p> Thomas A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.</p>
<p align="left">The remainder of this quide will assume that you have configured <p align="left">The remainder of this quide will assume that you have configured
your network as shown here:</p> your network as shown here:</p>
@ -422,33 +424,33 @@ Routing",</i> Thomas A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13" alt=""> height="13" alt="">
    <font color="#ff0000"><b>WARNING: </b></font><b>Your ISP  might     <font color="#ff0000"><b>WARNING: </b></font><b>Your ISP  might
assign your external interface an RFC 1918 address. If that address is assign your external interface an RFC 1918 address. If that address is
in the 10.10.10.0/24 subnet then you will need to select a DIFFERENT RFC in the 10.10.10.0/24 subnet then you will need to select a DIFFERENT RFC
1918 subnet for your local network and if it is in the 10.10.11.0/24 subnet 1918 subnet for your local network and if it is in the 10.10.11.0/24 subnet
then you will need to select a different RFC 1918 subnet for your DMZ.</b><br> then you will need to select a different RFC 1918 subnet for your DMZ.</b><br>
</p> </p>
<p align="left">IP Masquerading (SNAT)</p> <p align="left">IP Masquerading (SNAT)</p>
<p align="left">The addresses reserved by RFC 1918 are sometimes referred <p align="left">The addresses reserved by RFC 1918 are sometimes referred
to as <i>non-routable</i> because the Internet backbone routers to as <i>non-routable</i> because the Internet backbone routers don't
don't forward packets which have an RFC-1918 destination address. forward packets which have an RFC-1918 destination address. When
When one of your local systems (let's assume local computer 1) sends one of your local systems (let's assume local computer 1) sends a
a connection request to an internet host, the firewall must perform connection request to an internet host, the firewall must perform <i>Network
<i>Network Address Translation </i>(NAT). The firewall rewrites the Address Translation </i>(NAT). The firewall rewrites the source address
source address in the packet to be the address of the firewall's external in the packet to be the address of the firewall's external interface;
interface; in other words, the firewall makes it look as if the firewall in other words, the firewall makes it look as if the firewall itself
itself is initiating the connection.  This is necessary so that the is initiating the connection.  This is necessary so that the destination
destination host will be able to route return packets back to the firewall host will be able to route return packets back to the firewall (remember
(remember that packets whose destination address is reserved by RFC that packets whose destination address is reserved by RFC 1918 can't
1918 can't be routed accross the internet). When the firewall receives be routed accross the internet). When the firewall receives a return
a return packet, it rewrites the destination address back to 10.10.10.1 packet, it rewrites the destination address back to 10.10.10.1 and forwards
and forwards the packet on to local computer 1. </p> the packet on to local computer 1. </p>
<p align="left">On Linux systems, the above process is often referred to <p align="left">On Linux systems, the above process is often referred to as<i>
as<i> IP Masquerading</i> and you will also see the term <i>Source Network IP Masquerading</i> and you will also see the term <i>Source Network Address
Address Translation </i>(SNAT) used. Shorewall follows the convention used Translation </i>(SNAT) used. Shorewall follows the convention used with
with Netfilter:</p> Netfilter:</p>
<ul> <ul>
<li> <li>
@ -470,14 +472,14 @@ with Netfilter:</p>
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
    If your external firewall interface is <b>eth0</b>,     If your external firewall interface is <b>eth0</b>,
your local interface <b>eth1 </b>and your DMZ interface is <b>eth2</b> your local interface <b>eth1 </b>and your DMZ interface is <b>eth2</b>
then you do not need to modify the file provided with the sample. Otherwise, then you do not need to modify the file provided with the sample. Otherwise,
edit /etc/shorewall/masq and change it to match your configuration.</p> edit /etc/shorewall/masq and change it to match your configuration.</p>
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
    If your external IP is static, you can enter it in     If your external IP is static, you can enter it in
the third column in the /etc/shorewall/masq entry if you like although the third column in the /etc/shorewall/masq entry if you like although
your firewall will work fine if you leave that column empty. Entering your firewall will work fine if you leave that column empty. Entering
your static IP in column 3 makes <br> your static IP in column 3 makes <br>
processing outgoing packets a little more efficient.<br> processing outgoing packets a little more efficient.<br>
@ -500,13 +502,13 @@ the third column in the /etc/shorewall/masq entry if you like although
<h2 align="left">Port Forwarding (DNAT)</h2> <h2 align="left">Port Forwarding (DNAT)</h2>
<p align="left">One of your goals will be to run one or more servers on your <p align="left">One of your goals will be to run one or more servers on your
DMZ computers. Because these computers have RFC-1918 addresses, DMZ computers. Because these computers have RFC-1918 addresses, it
it is not possible for clients on the internet to connect directly is not possible for clients on the internet to connect directly to
to them. It is rather necessary for those clients to address their them. It is rather necessary for those clients to address their connection
connection requests to your firewall who rewrites the destination requests to your firewall who rewrites the destination address to
address to the address of your server and forwards the packet to that the address of your server and forwards the packet to that server.
server. When your server responds, the firewall automatically performs When your server responds, the firewall automatically performs SNAT
SNAT to rewrite the source address in the response.</p> to rewrite the source address in the response.</p>
<p align="left">The above process is called<i> Port Forwarding</i> or <i> <p align="left">The above process is called<i> Port Forwarding</i> or <i>
Destination Network Address Translation</i> (DNAT). You configure Destination Network Address Translation</i> (DNAT). You configure
@ -543,8 +545,8 @@ SNAT to rewrite the source address in the response.</p>
</table> </table>
</blockquote> </blockquote>
<p>If you don't specify the <i>&lt;server port&gt;</i>, it is assumed to <p>If you don't specify the <i>&lt;server port&gt;</i>, it is assumed to be
be the same as <i>&lt;port&gt;</i>.</p> the same as <i>&lt;port&gt;</i>.</p>
<p>Example - you run a Web Server on DMZ 2 and you want to forward incoming <p>Example - you run a Web Server on DMZ 2 and you want to forward incoming
TCP port 80 to that system:</p> TCP port 80 to that system:</p>
@ -589,12 +591,12 @@ be the same as <i>&lt;port&gt;</i>.</p>
<ul> <ul>
<li>When you are connecting to your server from your <li>When you are connecting to your server from your
local systems, you must use the server's internal IP address (10.10.11.2).</li> local systems, you must use the server's internal IP address (10.10.11.2).</li>
<li>Many ISPs block incoming connection requests to <li>Many ISPs block incoming connection requests to
port 80. If you have problems connecting to your web server, try port 80. If you have problems connecting to your web server, try
the following rule and try connecting to port 5000 (e.g., connect the following rule and try connecting to port 5000 (e.g., connect
to <a href="http://w.x.y.z:5000"> http://w.x.y.z:5000</a> where w.x.y.z to <a href="http://w.x.y.z:5000"> http://w.x.y.z:5000</a> where w.x.y.z
is your external IP).</li> is your external IP).</li>
</ul> </ul>
@ -698,38 +700,38 @@ is your external IP).</li>
</blockquote> </blockquote>
<p>If you want to access your server from the DMZ using your external IP <p>If you want to access your server from the DMZ using your external IP
address, see <a href="FAQ.htm#faq2a">FAQ 2a</a>.</p> address, see <a href="FAQ.htm#faq2a">FAQ 2a</a>.</p>
<p><img border="0" src="images/BD21298_2.gif" width="13" height="13"> <p><img border="0" src="images/BD21298_2.gif" width="13" height="13">
    At this point, add the DNAT and ACCEPT rules for your     At this point, add the DNAT and ACCEPT rules for
servers. </p> your servers. </p>
<h2 align="left">Domain Name Server (DNS)</h2> <h2 align="left">Domain Name Server (DNS)</h2>
<p align="left">Normally, when you connect to your ISP, as part of getting <p align="left">Normally, when you connect to your ISP, as part of getting
an IP address your firewall's <i>Domain Name Service </i>(DNS) an IP address your firewall's <i>Domain Name Service </i>(DNS) resolver
resolver will be automatically configured (e.g., the /etc/resolv.conf will be automatically configured (e.g., the /etc/resolv.conf file
file will be written). Alternatively, your ISP may have given you will be written). Alternatively, your ISP may have given you the IP
the IP address of a pair of DNS <i> name servers</i> for you to manually address of a pair of DNS <i> name servers</i> for you to manually configure
configure as your primary and secondary name servers. It is <u>your</u> as your primary and secondary name servers. It is <u>your</u> responsibility
responsibility to configure the resolver in your internal systems. to configure the resolver in your internal systems. You can take
You can take one of two approaches:</p> one of two approaches:</p>
<ul> <ul>
<li> <li>
<p align="left">You can configure your internal systems to use your ISP's <p align="left">You can configure your internal systems to use your ISP's
name servers. If you ISP gave you the addresses of their servers name servers. If you ISP gave you the addresses of their servers
or if those addresses are available on their web site, you can or if those addresses are available on their web site, you can configure
configure your internal systems to use those addresses. If that your internal systems to use those addresses. If that information
information isn't available, look in /etc/resolv.conf on your firewall isn't available, look in /etc/resolv.conf on your firewall system
system -- the name servers are given in "nameserver" records in that -- the name servers are given in "nameserver" records in that file.
file. </p> </p>
</li> </li>
<li> <li>
<p align="left"><img border="0" src="images/BD21298_2.gif" <p align="left"><img border="0" src="images/BD21298_2.gif"
width="13" height="13"> width="13" height="13">
    You can configure a<i> Caching Name Server </i>on your     You can configure a<i> Caching Name Server </i>on
firewall or in your DMZ.<i> </i>Red Hat has an RPM for a caching your firewall or in your DMZ.<i> </i>Red Hat has an RPM for a caching
name server (which also requires the 'bind' RPM) and for Bering name server (which also requires the 'bind' RPM) and for Bering
users, there is dnscache.lrp. If you take this approach, you configure users, there is dnscache.lrp. If you take this approach, you configure
your internal systems to use the caching name server as their primary your internal systems to use the caching name server as their primary
@ -1136,7 +1138,7 @@ you want shell access to your firewall from the internet, use SSH:</p>
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
    Now modify /etc/shorewall/rules to add or remove     Now modify /etc/shorewall/rules to add or remove
other connections as required.</p> other connections as required.</p>
</div> </div>
<div align="left"> <div align="left">
@ -1149,8 +1151,8 @@ other connections as required.</p>
    The <a href="Install.htm">installation procedure </a>     The <a href="Install.htm">installation procedure </a>
configures your system to start Shorewall at system boot  but beginning configures your system to start Shorewall at system boot  but beginning
with Shorewall version 1.3.9 startup is disabled so that your system with Shorewall version 1.3.9 startup is disabled so that your system
won't try to start Shorewall before configuration is complete. Once you won't try to start Shorewall before configuration is complete. Once
have completed configuration of your firewall, you can enable Shorewall you have completed configuration of your firewall, you can enable Shorewall
startup by removing the file /etc/shorewall/startup_disabled.<br> startup by removing the file /etc/shorewall/startup_disabled.<br>
</p> </p>
@ -1166,25 +1168,25 @@ other connections as required.</p>
routing is enabled on those hosts that have an entry in <a routing is enabled on those hosts that have an entry in <a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. A href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. A
running firewall may be restarted using the "shorewall restart" running firewall may be restarted using the "shorewall restart"
command. If you want to totally remove any trace of Shorewall command. If you want to totally remove any trace of Shorewall from
from your Netfilter configuration, use "shorewall clear".</p> your Netfilter configuration, use "shorewall clear".</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
    The three-interface sample assumes that you want to     The three-interface sample assumes that you want to
enable routing to/from <b>eth1 (</b>your local network) and<b> eth2 enable routing to/from <b>eth1 (</b>your local network) and<b>
</b>(DMZ) when Shorewall is stopped. If these two interfaces don't eth2 </b>(DMZ) when Shorewall is stopped. If these two interfaces
connect to your local network and DMZ or if you want to enable a don't connect to your local network and DMZ or if you want to enable
different set of hosts, modify /etc/shorewall/routestopped accordingly.</p> a different set of hosts, modify /etc/shorewall/routestopped accordingly.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left"><b>WARNING: </b>If you are connected to your firewall from <p align="left"><b>WARNING: </b>If you are connected to your firewall from
the internet, do not issue a "shorewall stop" command unless the internet, do not issue a "shorewall stop" command unless you
you have added an entry for the IP address that you are connected have added an entry for the IP address that you are connected from
from to <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. to <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
Also, I don't recommend using "shorewall restart"; it is better to Also, I don't recommend using "shorewall restart"; it is better to
create an <i><a href="configuration_file_basics.htm#Configs">alternate create an <i><a href="configuration_file_basics.htm#Configs">alternate
configuration</a></i> and test it using the <a configuration</a></i> and test it using the <a
@ -1196,6 +1198,7 @@ create an <i><a href="configuration_file_basics.htm#Configs">alternate
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002, 2003 <p align="left"><a href="copyright.htm"><font size="2">Copyright 2002, 2003
Thomas M. Eastep</font></a><br> Thomas M. Eastep</font></a><br>
</p> </p>
<br>
</body> </body>
</html> </html>

319
Shorewall-docs/three-interface_fr.html
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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber5" bgcolor="#400169" height="90"> id="AutoNumber5" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -42,21 +42,21 @@ ce document <a href="mailto:vetsel.patrice@wanadoo.fr">VETSEL Patrice</a>
Tom EASTEP pour son formidable outil et sa disponibilité).</i></small></p> Tom EASTEP pour son formidable outil et sa disponibilité).</i></small></p>
<p align="left"><br> <p align="left"><br>
Mettre en place un système linux en tant que firewall pour un petit réseau Mettre en place un système linux en tant que firewall pour un petit
contenant une DMZ est une chose assez simple à réaliser si vous comprenez réseau contenant une DMZ est une chose assez simple à réaliser si vous
les bases et suivez cette documentation.</p> comprenez les bases et suivez cette documentation.</p>
<p>Ce guide ne prétend pas vous mettre au courant de toutes les possibilités <p>Ce guide ne prétend pas vous mettre au courant de toutes les possibilités
de Shorewall. Il se focalise sur les besoins pour configurer Shorewall dans de Shorewall. Il se focalise sur les besoins pour configurer Shorewall
une de ses utilisations les plus populaire :</p> dans une de ses utilisations les plus populaire :</p>
<ul> <ul>
<li>Un système Linux utilisé en tant que firewall/routeur pour un petit <li>Un système Linux utilisé en tant que firewall/routeur pour un
réseau local.</li> petit réseau local.</li>
<li>Une seule adresse IP publique.</li> <li>Une seule adresse IP publique.</li>
<li>Une DMZ connectée sur une interface Ethernet séparée.</li> <li>Une DMZ connectée sur une interface Ethernet séparée.</li>
<li>Une connexion passant par l'ADSL, un Modem Câble, ISDN, Frame Relay, <li>Une connexion passant par l'ADSL, un Modem Câble, ISDN, Frame
RTC, ...</li> Relay, RTC, ...</li>
</ul> </ul>
@ -66,17 +66,17 @@ Tom EASTEP pour son formidable outil et sa disponibilit
height="635"> height="635">
</p> </p>
<p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'installé. Vous <p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'installé.
pouvez voir si le paquet est installé en vérifiant la présence du programme Vous pouvez voir si le paquet est installé en vérifiant la présence du programme
ip sur votre système de firewall. Sous root, utilisez la commande 'which' ip sur votre système de firewall. Sous root, utilisez la commande 'which'
pour rechercher le programme :</p> pour rechercher le programme :</p>
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre> <pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
<p>Je vous recommande dans un premier temps de parcourir tout le guide pour <p>Je vous recommande dans un premier temps de parcourir tout le guide pour
vous familiariser avec ce qu'il va se passer, et de revenir au début en effectuant vous familiariser avec ce qu'il va se passer, et de revenir au début en
le changements dans votre configuration. Les points où, les changements dans effectuant le changements dans votre configuration. Les points où, les changements
la configuration sont recommandées, sont signalés par une <img dans la configuration sont recommandées, sont signalés par une <img
border="0" src="images/BD21298_.gif" width="13" height="13"> border="0" src="images/BD21298_.gif" width="13" height="13">
</p> </p>
@ -92,7 +92,7 @@ sur la copie avant de l'utiliser avec Shorewall.</p>
<li><a href="http://www.simtel.net/pub/pd/51438.html">Windows Version <li><a href="http://www.simtel.net/pub/pd/51438.html">Windows Version
of dos2unix</a></li> of dos2unix</a></li>
<li><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux <li><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux
Version of dos2unix</a></li> Version of dos2unix</a></li>
</ul> </ul>
@ -107,8 +107,8 @@ Version of dos2unix</a></li>
d'exemple <a href="http://www1.shorewall.net/pub/shorewall/Samples/">three-interface d'exemple <a href="http://www1.shorewall.net/pub/shorewall/Samples/">three-interface
sample</a>, un-tarez la (tar -zxvf three-interfaces.tgz) </b><b>et copiez sample</a>, un-tarez la (tar -zxvf three-interfaces.tgz) </b><b>et copiez
les fichiers vers /etc/shorewall (Ils remplaceront les fichiers de même les fichiers vers /etc/shorewall (Ils remplaceront les fichiers de même
nom déjà existant dans /etc/shorewall installés lors de l'installation de nom déjà existant dans /etc/shorewall installés lors de l'installation de
Shorewall)</b>.</p> Shorewall)</b>.</p>
<p>En même temps que chacun des fichiers est présenté, je vous suggère de <p>En même temps que chacun des fichiers est présenté, je vous suggère de
jeter un oeil à ceux qui se trouvent réellement sur votre système -- chacun jeter un oeil à ceux qui se trouvent réellement sur votre système -- chacun
@ -144,8 +144,8 @@ Shorewall)</b>.</p>
<p>Les noms de zone sont définis dans <a href="Documentation.htm#Zones">/etc/shorewall/zones</a>.</p> <p>Les noms de zone sont définis dans <a href="Documentation.htm#Zones">/etc/shorewall/zones</a>.</p>
<p>Shorewall reconnaît aussi le système de firewall comme sa propre zone - <p>Shorewall reconnaît aussi le système de firewall comme sa propre zone
par défaut, le firewall lui même est connu en tant que <b>fw</b>.</p> - par défaut, le firewall lui même est connu en tant que <b>fw</b>.</p>
<p>Les règles concernant le trafic à autoriser ou à interdire sont exprimées <p>Les règles concernant le trafic à autoriser ou à interdire sont exprimées
en utilisant les termes de zones.</p> en utilisant les termes de zones.</p>
@ -154,18 +154,18 @@ par d
<li>Vous exprimez les politiques par défaut pour les connexions d'une <li>Vous exprimez les politiques par défaut pour les connexions d'une
zone à une autre dans le fichier<a href="Documentation.htm#Policy"> /etc/shorewall/policy zone à une autre dans le fichier<a href="Documentation.htm#Policy"> /etc/shorewall/policy
</a>.</li> </a>.</li>
<li>Vous définissez les exceptions à ces règles de politiques par défaut <li>Vous définissez les exceptions à ces règles de politiques par
dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li> défaut dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li>
</ul> </ul>
<p>Pour chacune des demandes de connexion entrantes dans le firewall, les <p>Pour chacune des demandes de connexion entrantes dans le firewall, les
demandes sont en premier lieu comparées par rapport au fichier /etc/shorewall/rules. demandes sont en premier lieu comparées par rapport au fichier /etc/shorewall/rules.
Si aucune des règles dans ce fichier ne correspondent, alors la première Si aucune des règles dans ce fichier ne correspondent, alors la première
politique dans /etc/shorewall/policy qui y correspond est appliquée. Si cette politique dans /etc/shorewall/policy qui y correspond est appliquée. Si
politique est REJECT ou DROP la requête est alors comparée par rapport aux cette politique est REJECT ou DROP la requête est alors comparée par rapport
règles contenues dans /etc/shorewall/common (l'archive d'exemple vous fournit aux règles contenues dans /etc/shorewall/common (l'archive d'exemple vous
ce fichier).</p> fournit ce fichier).</p>
<p>Le fichier /etc/shorewall/policy d'exemple contenu dans l'archive three-interface <p>Le fichier /etc/shorewall/policy d'exemple contenu dans l'archive three-interface
sample a les politiques suivantes :</p> sample a les politiques suivantes :</p>
@ -265,13 +265,13 @@ l'Internet</li>
<p align="left">Le firewall a trois interfaces de réseau. Lorsque la connexion <p align="left">Le firewall a trois interfaces de réseau. Lorsque la connexion
Internet passe par le câble ou par un ROUTEUR (pas un simple modem) ADSL Internet passe par le câble ou par un ROUTEUR (pas un simple modem) ADSL
(non USB), l'interface vers l'extérieur (External Interface) sera l'adaptateur (non USB), l'interface vers l'extérieur (External Interface) sera l'adaptateur
sur lequel est connecté le routeur (e.g., eth0) à moins que vous ne vous sur lequel est connecté le routeur (e.g., eth0) à moins que vous ne vous
connectiez par Point-to-PointProtocol overEthernet (PPPoE) ou par Point-to-PointTunneling connectiez par Point-to-PointProtocol overEthernet (PPPoE) ou par Point-to-PointTunneling
Protocol (PPTP), dans ce cas l'interface extérieure sera une interface de Protocol (PPTP), dans ce cas l'interface extérieure sera une interface
type ppp (e.g., ppp0). Si vous vous connectez par un simple modem (RTC), de type ppp (e.g., ppp0). Si vous vous connectez par un simple modem (RTC),
votre interface extérieure sera aussi ppp0. Si votre connexion passe par Numéris votre interface extérieure sera aussi ppp0. Si votre connexion passe par
(ISDN), votre interface extérieure sera ippp0<b>.</b></p> Numéris (ISDN), votre interface extérieure sera ippp0<b>.</b></p>
<p align="left"><img border="0" src="images/BD21298_1.gif" width="13" <p align="left"><img border="0" src="images/BD21298_1.gif" width="13"
height="13"> height="13">
@ -279,31 +279,31 @@ votre interface ext
CLAMPMSS=yes dans <a href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf.</a></p> CLAMPMSS=yes dans <a href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf.</a></p>
<p align="left">Votre <i>Interface locale</i> sera un adaptateur Ethernet <p align="left">Votre <i>Interface locale</i> sera un adaptateur Ethernet
(eth0, eth1 ou eth2) et sera connecté à un hub ou un switch. Vos ordinateurs (eth0, eth1 ou eth2) et sera connecté à un hub ou un switch. Vos
locaux seront connectés à ce même switch (note : si vous n'avez qu'un seul ordinateurs locaux seront connectés à ce même switch (note : si vous n'avez
ordinateur en local, vous pouvez le connecter directement au firewall par qu'un seul ordinateur en local, vous pouvez le connecter directement au
un <i>câble croisé</i>).</p> firewall par un <i>câble croisé</i>).</p>
<p align="left">Votre <i>interface DMZ</i> sera aussi un adaptateur Ethernet <p align="left">Votre <i>interface DMZ</i> sera aussi un adaptateur Ethernet
(eth0, eth1 ou eth2) et sera connecté à un hub ou un switch. Vos ordinateurs (eth0, eth1 ou eth2) et sera connecté à un hub ou un switch. Vos ordinateurs
appartenant à la DMZ seront connectés à ce même switch (note : si vous n'avez appartenant à la DMZ seront connectés à ce même switch (note : si vous
qu'un seul ordinateur dans la DMZ, vous pouvez le connecter directement au n'avez qu'un seul ordinateur dans la DMZ, vous pouvez le connecter directement
firewall par un <i>câble croisé</i>).</p> au firewall par un <i>câble croisé</i>).</p>
<p align="left"><u><b> <img border="0" src="images/j0213519.gif" <p align="left"><u><b> <img border="0" src="images/j0213519.gif"
width="60" height="60"> width="60" height="60">
</b></u> Ne connectez pas l'interface interne et externe sur le même hub </b></u> Ne connectez pas l'interface interne et externe sur le même
ou switch (même pour tester). Cela ne fonctionnera pas et ne croyez pas que hub ou switch (même pour tester). Cela ne fonctionnera pas et ne croyez
ce soit shorewall qui ne marche pas.</p> pas que ce soit shorewall qui ne marche pas.</p>
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
L'exemple de configuration de Shorewall pour trois interfaces suppose L'exemple de configuration de Shorewall pour trois interfaces suppose
que l'interface externe est <b>eth0, </b>l'interface locale est <b>eth1 </b> que l'interface externe est <b>eth0, </b>l'interface locale est <b>eth1
et que la DMZ est sur l'interface <b>eth2</b>. Si votre configuration diffère, </b> et que la DMZ est sur l'interface <b>eth2</b>. Si votre configuration
vous devrez modifier le fichier d'exemple /etc/shorewall/interfaces en conséquence. diffère, vous devrez modifier le fichier d'exemple /etc/shorewall/interfaces
Tant que vous y êtes, vous pourriez parcourir la liste des options qui sont en conséquence. Tant que vous y êtes, vous pourriez parcourir la liste des
spécifiées pour les interfaces. Quelques trucs :</p> options qui sont spécifiées pour les interfaces. Quelques trucs :</p>
<ul> <ul>
<li> <li>
@ -311,9 +311,9 @@ et que la DMZ est sur l'interface <b>eth2</b>. Si votre configuration diff
remplacer le "detect" dans la seconde colonne par un "-". </p> remplacer le "detect" dans la seconde colonne par un "-". </p>
</li> </li>
<li> <li>
<p align="left">Si votre interface externe est ppp0 ou ippp0 ou bien si <p align="left">Si votre interface externe est ppp0 ou ippp0 ou bien
vous avez une adresse IP statique, vous pouvez enlever le "dhcp" de la liste si vous avez une adresse IP statique, vous pouvez enlever le "dhcp" de la
d'option. </p> liste d'option. </p>
</li> </li>
</ul> </ul>
@ -324,15 +324,16 @@ d'option. </p>
sujet du Protocole d'adresse Internet (IP). Normalement, votre fournisseur sujet du Protocole d'adresse Internet (IP). Normalement, votre fournisseur
Internet (ISP) vous assignera une seule adresse IP (single Public IP address). Internet (ISP) vous assignera une seule adresse IP (single Public IP address).
Cette adresse peut être assignée par le Dynamic Host Configuration Protocol Cette adresse peut être assignée par le Dynamic Host Configuration Protocol
(DHCP) ou lors de l'établissement de votre connexion lorsque vous vous connectez (DHCP) ou lors de l'établissement de votre connexion lorsque vous vous
(modem standard) ou établissez votre connexion PPP. Dans de rares cas , votre connectez (modem standard) ou établissez votre connexion PPP. Dans de rares
provider peu vous assigner une adresse statique (staticIP address); cela cas , votre provider peu vous assigner une adresse statique (staticIP address);
signifie que vous configurez votre interface externe sur votre firewall afin cela signifie que vous configurez votre interface externe sur votre firewall
d'utiliser cette adresse de manière permanente. Une fois votre adresse externe afin d'utiliser cette adresse de manière permanente. Une fois votre adresse
assignée, elle va être partagée par tout vos systèmes lors de l'accès à Internet. externe assignée, elle va être partagée par tout vos systèmes lors de l'accès
Vous devrez assigner vos propres adresses à votre réseau local (votre interface à Internet. Vous devrez assigner vos propres adresses à votre réseau local
interne sur le firewall ainsi que les autres ordinateurs). La RFC 1918 (votre interface interne sur le firewall ainsi que les autres ordinateurs).
réserve plusieurs plages d'IP (Private IP address ranges) à cette fin :</p> La RFC 1918 réserve plusieurs plages d'IP (Private IP address ranges) à
cette fin :</p>
<div align="left"> <div align="left">
<pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre> <pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre>
@ -341,9 +342,9 @@ r
<div align="left"> <div align="left">
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
Avant de lancer Shorewall, vous devriez regarder l'adresse de votre interface Avant de lancer Shorewall, vous devriez regarder l'adresse de votre
externe et si elle est comprise dans une des plages précédentes, vous devriez interface externe et si elle est comprise dans une des plages précédentes,
enlever l'option 'norfc1918' dans le fichier /etc/shorewall/interfaces.</p> vous devriez enlever l'option 'norfc1918' dans le fichier /etc/shorewall/interfaces.</p>
</div> </div>
<div align="left"> <div align="left">
@ -351,14 +352,15 @@ r
(<i>sub-network </i>ou <i>subnet)</i> et les adresse pour la DMZ à un autre (<i>sub-network </i>ou <i>subnet)</i> et les adresse pour la DMZ à un autre
sous-réseau. Pour ce faire, nous pouvons considérer qu'un sous-réseau consiste sous-réseau. Pour ce faire, nous pouvons considérer qu'un sous-réseau consiste
en une plage d'adresse x.y.z.0 à x.y.z.255. Chacun des sous-réseaux possèdera en une plage d'adresse x.y.z.0 à x.y.z.255. Chacun des sous-réseaux possèdera
une masque (<i>Subnet Mask)</i> de 255.255.255.0. L'adresse x.y.z.0 est une masque (<i>Subnet Mask)</i> de 255.255.255.0. L'adresse x.y.z.0
réservée comme l'adresse du sous-réseau (<i>Subnet Address)</i> et x.y.z.255 est réservée comme l'adresse du sous-réseau (<i>Subnet Address)</i>
est réservée en tant qu'adresse de broadcast du sous-réseau (<i>Subnet Broadcast</i> et x.y.z.255 est réservée en tant qu'adresse de broadcast du sous-réseau
<i>Address)</i>. Sous Shorewall, un sous-réseau est décrit/désigné en utilisant (<i>Subnet Broadcast</i> <i>Address)</i>. Sous Shorewall, un sous-réseau
la notation <a href="shorewall_setup_guide.htm#Subnets"><i>Classless InterDomain est décrit/désigné en utilisant la notation <a
Routing</i>(CIDR)</a> qui consiste en l'adresse du sous-réseau suivie par href="shorewall_setup_guide.htm#Subnets"><i>Classless InterDomain Routing</i>(CIDR)</a>
"/24". Le "24" se réfère au nombre de bits "1" consécutifs dans la partie qui consiste en l'adresse du sous-réseau suivie par "/24". Le "24" se réfère
gauche du masque de sous-réseau. </p> au nombre de bits "1" consécutifs dans la partie gauche du masque de sous-réseau.
</p>
</div> </div>
<div align="left"> <div align="left">
@ -393,17 +395,17 @@ r
</div> </div>
<div align="left"> <div align="left">
<p align="left">Il est de convention d'assigner à l'interface interne la première <p align="left">Il est de convention d'assigner à l'interface interne la
adresse utilisable dans le sous-réseau (10.10.10.1 dans l'exemple précédent) première adresse utilisable dans le sous-réseau (10.10.10.1 dans l'exemple
ou la dernière utilisable (10.10.10.254).</p> précédent) ou la dernière utilisable (10.10.10.254).</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">L'un des buts d'un sous-réseau est de permettre à tous les <p align="left">L'un des buts d'un sous-réseau est de permettre à tous les
ordinateurs dans le sous-réseau de savoir avec quels autres ordinateurs ils ordinateurs dans le sous-réseau de savoir avec quels autres ordinateurs
peuvent communiquer directement. Pour communiquer avec des systèmes en dehors ils peuvent communiquer directement. Pour communiquer avec des systèmes
du sous-réseau, les ordinateurs envoient des paquets à travers le gateway en dehors du sous-réseau, les ordinateurs envoient des paquets à travers
(routeur).</p> le gateway (routeur).</p>
</div> </div>
<div align="left"> <div align="left">
@ -413,13 +415,13 @@ adresse utilisable dans le sous-r
avec leur passerelle par défaut (<i>default gateway)</i>pointant sur l'adresse avec leur passerelle par défaut (<i>default gateway)</i>pointant sur l'adresse
IP de l'interface interne du firewall, et les ordinateurs de la DMZ devraient IP de l'interface interne du firewall, et les ordinateurs de la DMZ devraient
être configurés avec leur passerelle par défaut (<i>default gateway)</i> être configurés avec leur passerelle par défaut (<i>default gateway)</i>
pointant sur l'adresse IP de l'interface DMZ du firewall. </p> pointant sur l'adresse IP de l'interface DMZ du firewall. </p>
</div> </div>
<p align="left">Cette courte description ne fait que survoler les concepts <p align="left">Cette courte description ne fait que survoler les concepts
de routage et de sous-réseau. Si vous vous voulez en apprendre plus sur l'adressage de routage et de sous-réseau. Si vous vous voulez en apprendre plus sur
IP et le routage, je vous recommande chaudement <i>"IP Fundamentals: l'adressage IP et le routage, je vous recommande chaudement <i>"IP Fundamentals:
What Everyone Needs to Know about Addressing &amp; Routing",</i> Thomas What Everyone Needs to Know about Addressing &amp; Routing",</i> Thomas
A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.</p> A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.</p>
<p align="left">Pour rappel, ce guide supposera que vous avez configuré votre <p align="left">Pour rappel, ce guide supposera que vous avez configuré votre
@ -430,8 +432,8 @@ What Everyone Needs to Know about Addressing &amp; Routing",</i> Thomas
</p> </p>
<p align="left">La passerelle par défaut (default gateway) pour les ordinateurs <p align="left">La passerelle par défaut (default gateway) pour les ordinateurs
de la DMZ sera 10.10.11.254 et le passerelle par défaut pour les ordinateurs de la DMZ sera 10.10.11.254 et le passerelle par défaut pour les
en local sera 10.10.10.254.</p> ordinateurs en local sera 10.10.10.254.</p>
<h2 align="left">IP Masquerading (SNAT)</h2> <h2 align="left">IP Masquerading (SNAT)</h2>
@ -439,21 +441,22 @@ What Everyone Needs to Know about Addressing &amp; Routing",</i> Thomas
comme non-routables car les routeurs Internet (backbone) ne font pas circuler comme non-routables car les routeurs Internet (backbone) ne font pas circuler
les paquets qui ont une adresse de destination appartenant à la RFC-1918. les paquets qui ont une adresse de destination appartenant à la RFC-1918.
Lorsqu'un de vos systèmes en local (supposons l'ordinateur1) demande une Lorsqu'un de vos systèmes en local (supposons l'ordinateur1) demande une
connexion à un serveur par Internet, le firewall doit appliquer un NAT (Network connexion à un serveur par Internet, le firewall doit appliquer un NAT (Network
Address Translation). Le firewall ré écrit l'adresse source dans le paquet, Address Translation). Le firewall ré écrit l'adresse source dans le paquet,
et l'a remplace par l'adresse de l'interface externe du firewall; en d'autres et l'a remplace par l'adresse de l'interface externe du firewall; en d'autres
mots, le firewall fait croire que c'est lui même qui initie la connexion. mots, le firewall fait croire que c'est lui même qui initie la connexion.
Ceci est nécessaire afin que l'hôte de destination soit capable de renvoyer Ceci est nécessaire afin que l'hôte de destination soit capable de renvoyer
les paquets au firewall (souvenez vous que les paquets qui ont pour adresse les paquets au firewall (souvenez vous que les paquets qui ont pour adresse
de destination, une adresse réservée par la RFC 1918 ne pourront pas être de destination, une adresse réservée par la RFC 1918 ne pourront pas être
routés à travers Internet, donc l'hôte Internet ne pourra adresser sa réponse routés à travers Internet, donc l'hôte Internet ne pourra adresser sa réponse
à l'ordinateur 1). Lorsque le firewall reçoit le paquet de réponse, il remet à l'ordinateur 1). Lorsque le firewall reçoit le paquet de réponse, il remet
l'adresse de destination à 10.10.10.1 et fait passer le paquet vers l'ordinateur l'adresse de destination à 10.10.10.1 et fait passer le paquet vers l'ordinateur
1. </p> 1. </p>
<p align="left">Sur les systèmes Linux, ce procédé est souvent appelé de l'IP <p align="left">Sur les systèmes Linux, ce procédé est souvent appelé de
Masquerading mais vous verrez aussi le terme de Source Network Address Translation l'IP Masquerading mais vous verrez aussi le terme de Source Network Address
(SNAT) utilisé. Shorewall suit la convention utilisée avec Netfilter :</p> Translation (SNAT) utilisé. Shorewall suit la convention utilisée avec Netfilter
:</p>
<ul> <ul>
<li> <li>
@ -481,9 +484,9 @@ Masquerading mais vous verrez aussi le terme de Source Network Address Translati
height="13"> height="13">
Si votre IP externe est statique, vous pouvez la mettre dans la troisième Si votre IP externe est statique, vous pouvez la mettre dans la troisième
colonne dans /etc/shorewall/masq si vous le désirez, de toutes façons votre colonne dans /etc/shorewall/masq si vous le désirez, de toutes façons votre
firewall fonctionnera bien si vous laissez cette colonne vide. Le fait de firewall fonctionnera bien si vous laissez cette colonne vide. Le fait
mettre votre IP statique dans la troisième colonne permet un traitement des de mettre votre IP statique dans la troisième colonne permet un traitement
paquets sortant un peu plus efficace.<br> des paquets sortant un peu plus efficace.<br>
</p> </p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
@ -506,10 +509,10 @@ Masquerading mais vous verrez aussi le terme de Source Network Address Translati
serveurs sur nos ordinateurs dans la DMZ. que ces ordinateurs on une adresse serveurs sur nos ordinateurs dans la DMZ. que ces ordinateurs on une adresse
RFC-1918, il n'est pas possible pour les clients sur Internet de se connecter RFC-1918, il n'est pas possible pour les clients sur Internet de se connecter
directement à eux. Il est nécessaire à ces clients d'adresser leurs demandes directement à eux. Il est nécessaire à ces clients d'adresser leurs demandes
de connexion au firewall qui ré écrit l'adresse de destination de votre serveur, de connexion au firewall qui ré écrit l'adresse de destination de votre
et fait passer le paquet à celui-ci. Lorsque votre serveur répond, le firewall serveur, et fait passer le paquet à celui-ci. Lorsque votre serveur répond,
applique automatiquement un SNAT pour ré écrire l'adresse source dans la le firewall applique automatiquement un SNAT pour ré écrire l'adresse source
réponse.</p> dans la réponse.</p>
<p align="left">Ce procédé est appelé Port Forwarding ou Destination Network <p align="left">Ce procédé est appelé Port Forwarding ou Destination Network
Address Translation(DNAT). Vous configurez le port forwarding en utilisant Address Translation(DNAT). Vous configurez le port forwarding en utilisant
@ -535,7 +538,7 @@ r
<td>DNAT</td> <td>DNAT</td>
<td>net</td> <td>net</td>
<td>dmz:<i>&lt;server local ip address&gt; </i>[:<i>&lt;server <td>dmz:<i>&lt;server local ip address&gt; </i>[:<i>&lt;server
port&gt;</i>]</td> port&gt;</i>]</td>
<td><i>&lt;protocol&gt;</i></td> <td><i>&lt;protocol&gt;</i></td>
<td><i>&lt;port&gt;</i></td> <td><i>&lt;port&gt;</i></td>
<td> <br> <td> <br>
@ -594,14 +597,14 @@ port&gt;</i>]</td>
<p>Deux points importants à garder en mémoire :</p> <p>Deux points importants à garder en mémoire :</p>
<ul> <ul>
<li>Lorsque vous vous connectez à votre serveur à partir de votre réseau <li>Lorsque vous vous connectez à votre serveur à partir de votre
local, vous devez utiliser l'adresse IP interne du serveur (10.10.11.2).</li> réseau local, vous devez utiliser l'adresse IP interne du serveur (10.10.11.2).</li>
<li>Quelques fournisseurs Internet (Provider/ISP) bloquent les requêtes <li>Quelques fournisseurs Internet (Provider/ISP) bloquent les requêtes
de connexion entrantes sur le port 80. Si vous avez des problèmes pour vous de connexion entrantes sur le port 80. Si vous avez des problèmes pour
connecter à votre serveur web, essayez la règle suivante et connectez vous vous connecter à votre serveur web, essayez la règle suivante et connectez
sur le port 5000 (c.a.d., connectez vous à <a vous sur le port 5000 (c.a.d., connectez vous à <a
href="http://w.x.y.z:5000"> http://w.x.y.z:5000</a> où w.x.y.z est votre href="http://w.x.y.z:5000"> http://w.x.y.z:5000</a> où w.x.y.z est votre
IP externe).</li> IP externe).</li>
</ul> </ul>
@ -634,10 +637,10 @@ IP externe).</li>
</table> </table>
</blockquote> </blockquote>
<p>Si vous voulez avoir la possibilité de vous connecter à votre serveur depuis <p>Si vous voulez avoir la possibilité de vous connecter à votre serveur
le réseau local en utilisant votre adresse externe, et si vous avez une adresse depuis le réseau local en utilisant votre adresse externe, et si vous avez
IP externe statique (fixe), vous pouvez remplacer la règle loc-&gt;dmz précédente une adresse IP externe statique (fixe), vous pouvez remplacer la règle loc-&gt;dmz
par :</p> précédente par :</p>
<blockquote> <blockquote>
<table border="1" cellpadding="2" style="border-collapse: collapse;" <table border="1" cellpadding="2" style="border-collapse: collapse;"
@ -667,9 +670,9 @@ par :</p>
</blockquote> </blockquote>
<p>Si vous avez une IP dynamique, alors vous devez vous assurer que votre <p>Si vous avez une IP dynamique, alors vous devez vous assurer que votre
interface externe est en route avant de lancer Shorewall et vous devez suivre interface externe est en route avant de lancer Shorewall et vous devez
les étapes suivantes (en supposant que votre interface externe est <b>eth0</b>) suivre les étapes suivantes (en supposant que votre interface externe est
:</p> <b>eth0</b>) :</p>
<ol> <ol>
<li>Insérez ce qui suit dans /etc/shorewall/params :<br> <li>Insérez ce qui suit dans /etc/shorewall/params :<br>
@ -708,8 +711,8 @@ par :</p>
</table> </table>
</blockquote> </blockquote>
<p>Si vous voulez accéder à votre serveur dans la DMZ en utilisant votre adresse <p>Si vous voulez accéder à votre serveur dans la DMZ en utilisant votre
IP externe, regardez <a href="FAQ.htm#faq2a">FAQ 2a</a>.</p> adresse IP externe, regardez <a href="FAQ.htm#faq2a">FAQ 2a</a>.</p>
<p><img border="0" src="images/BD21298_2.gif" width="13" height="13"> <p><img border="0" src="images/BD21298_2.gif" width="13" height="13">
A ce point, ajoutez les règles DNAT et ACCEPT pour vos serveurs..</p> A ce point, ajoutez les règles DNAT et ACCEPT pour vos serveurs..</p>
@ -718,38 +721,38 @@ IP externe, regardez <a href="FAQ.htm#faq2a">FAQ 2a</a>.</p>
<p align="left">Normalement, quand vous vous connectez à votre fournisseur <p align="left">Normalement, quand vous vous connectez à votre fournisseur
(ISP), une partie consiste à obtenir votre adresse IP, votre DNS pour le (ISP), une partie consiste à obtenir votre adresse IP, votre DNS pour le
firewall (Domain Name Service) est configuré automatiquement (c.a.d., le fichier firewall (Domain Name Service) est configuré automatiquement (c.a.d., le
/etc/resolv.conf a été écrit). Il arrive que votre provider vous donne une fichier /etc/resolv.conf a été écrit). Il arrive que votre provider vous
paire d'adresse IP pour les DNS (name servers) afin que vous configuriez manuellement donne une paire d'adresse IP pour les DNS (name servers) afin que vous configuriez
votre serveur de nom primaire et secondaire. La manière dont le DNS est configuré manuellement votre serveur de nom primaire et secondaire. La manière dont
sur votre firewall est de votre responsabilité. Vous pouvez procéder d'une le DNS est configuré sur votre firewall est de votre responsabilité. Vous
de ses deux façons :</p> pouvez procéder d'une de ses deux façons :</p>
<ul> <ul>
<li> <li>
<p align="left">Vous pouvez configurer votre système interne pour utiliser <p align="left">Vous pouvez configurer votre système interne pour utiliser
les noms de serveurs de votre provider. Si votre fournisseur vous donne les les noms de serveurs de votre provider. Si votre fournisseur vous donne
adresses de leurs serveurs ou si ces adresses sont disponibles sur leur site les adresses de leurs serveurs ou si ces adresses sont disponibles sur leur
web, vous pouvez configurer votre système interne afin de les utiliser. Si site web, vous pouvez configurer votre système interne afin de les utiliser.
cette information n'est pas disponible, regardez dans /etc/resolv.conf sur Si cette information n'est pas disponible, regardez dans /etc/resolv.conf
votre firewall -- les noms des serveurs sont donnés dans l'enregistrement sur votre firewall -- les noms des serveurs sont donnés dans l'enregistrement
"nameserver" dans ce fichier. </p> "nameserver" dans ce fichier. </p>
</li> </li>
<li> <li>
<p align="left"><img border="0" src="images/BD21298_2.gif" <p align="left"><img border="0" src="images/BD21298_2.gif"
width="13" height="13"> width="13" height="13">
Vous pouvez installer/configurer un cache dns (Caching Name Server) sur Vous pouvez installer/configurer un cache dns (Caching Name Server)
votre firewall ou dans la DMZ.<i> </i>Red Hat a un RPM pour mettre en cache sur votre firewall ou dans la DMZ.<i> </i>Red Hat a un RPM pour mettre
un serveur de nom (le RPM requis aussi le RPM 'bind') et pour les utilisateurs en cache un serveur de nom (le RPM requis aussi le RPM 'bind') et pour
de Bering, il y a dnscache.lrp. Si vous adoptez cette approche, vous configurez les utilisateurs de Bering, il y a dnscache.lrp. Si vous adoptez cette
votre système interne pour utiliser le firewall lui même comme étant le seul approche, vous configurez votre système interne pour utiliser le firewall
serveur de nom primaire. Vous pouvez utiliser l'adresse IP interne du firewall lui même comme étant le seul serveur de nom primaire. Vous pouvez utiliser
(10.10.10.254 dans l'exemple) pour l'adresse de serveur de nom si vous décidez l'adresse IP interne du firewall (10.10.10.254 dans l'exemple) pour l'adresse
de faire tourner le serveur de nom sur votre firewall. Pour permettre à de serveur de nom si vous décidez de faire tourner le serveur de nom sur
vos systèmes locaux de discuter avec votre serveur cache de nom, vous devez votre firewall. Pour permettre à vos systèmes locaux de discuter avec votre
ouvrir le port 53 (UDP ET  TCP) sur le firewall vers le réseau local; vous serveur cache de nom, vous devez ouvrir le port 53 (UDP ET  TCP) sur le
ferez ceci en ajoutant les règles suivantes dans /etc/shorewall/rules. firewall vers le réseau local; vous ferez ceci en ajoutant les règles suivantes
</p> dans /etc/shorewall/rules. </p>
</li> </li>
</ul> </ul>
@ -1088,8 +1091,8 @@ ferez ceci en ajoutant les r
<div align="left"> <div align="left">
<p align="left">Important: Je ne vous recommande pas d'autoriser le telnet <p align="left">Important: Je ne vous recommande pas d'autoriser le telnet
depuis ou vers l'Internet car il utilise du texte en clair (même pour le depuis ou vers l'Internet car il utilise du texte en clair (même pour le
login et le mot de passe !). Si vous voulez avoir un accès au shell de votre login et le mot de passe !). Si vous voulez avoir un accès au shell de votre
firewall depuis Internet, utilisez SSH :</p> firewall depuis Internet, utilisez SSH :</p>
</div> </div>
<div align="left"> <div align="left">
@ -1126,8 +1129,8 @@ firewall depuis Internet, utilisez SSH :</p>
<div align="left"> <div align="left">
<p align="left"><img border="0" src="images/BD21298_2.gif" width="13" <p align="left"><img border="0" src="images/BD21298_2.gif" width="13"
height="13"> height="13">
Et maintenant, éditez /etc/shorewall/rules pour rajouter les autres connexions Et maintenant, éditez /etc/shorewall/rules pour rajouter les autres
désirées.</p> connexions désirées.</p>
</div> </div>
<div align="left"> <div align="left">
@ -1138,11 +1141,11 @@ firewall depuis Internet, utilisez SSH :</p>
<p align="left"> <img border="0" src="images/BD21298_2.gif" width="13" <p align="left"> <img border="0" src="images/BD21298_2.gif" width="13"
height="13" alt="Arrow"> height="13" alt="Arrow">
La <a href="Install.htm">procédure d'installation</a> configure votre La <a href="Install.htm">procédure d'installation</a> configure votre
système pour lancer Shorewall au boot du système, mais au début avec la version système pour lancer Shorewall au boot du système, mais au début avec la
1.3.9 de Shorewall le lancement est désactivé, n'essayer pas de lancer Shorewall version 1.3.9 de Shorewall le lancement est désactivé, n'essayer pas de
avec que la configuration soit finie. Une fois que vous en avez fini avec lancer Shorewall avec que la configuration soit finie. Une fois que vous
la configuration du firewall, vous pouvez permettre le lancement de Shorewall en avez fini avec la configuration du firewall, vous pouvez permettre le
en supprimant le fichier /etc/shorewall/startup_disabled.<br> lancement de Shorewall en supprimant le fichier /etc/shorewall/startup_disabled.<br>
</p> </p>
<p align="left">IMPORTANT: Les utilisateurs des paquets .deb doivent éditer <p align="left">IMPORTANT: Les utilisateurs des paquets .deb doivent éditer
@ -1152,8 +1155,8 @@ syst
<div align="left"> <div align="left">
<p align="left">Le firewall est activé en utilisant la commande "shorewall <p align="left">Le firewall est activé en utilisant la commande "shorewall
start" et arrêté avec "shorewall stop". Lorsque le firewall est stoppé, le start" et arrêté avec "shorewall stop". Lorsque le firewall est stoppé,
routage est autorisé sur les hôtes qui possèdent une entrée dans <a le routage est autorisé sur les hôtes qui possèdent une entrée dans <a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un
firewall qui tourne peut être relancé en utilisant la commande "shorewall firewall qui tourne peut être relancé en utilisant la commande "shorewall
restart". Si vous voulez enlever toutes traces de Shorewall sur votre configuration restart". Si vous voulez enlever toutes traces de Shorewall sur votre configuration
@ -1167,15 +1170,14 @@ syst
routage depuis/vers <b>eth1 </b>(votre réseau local) et<b> eth2</b>(DMZ) routage depuis/vers <b>eth1 </b>(votre réseau local) et<b> eth2</b>(DMZ)
lorsque Shorewall est arrêté. Si ces deux interfaces ne sont pas lorsque Shorewall est arrêté. Si ces deux interfaces ne sont pas
connectées à votre réseau local et votre DMZ, ou si vous voulez permettre connectées à votre réseau local et votre DMZ, ou si vous voulez permettre
un ensemble d'hôtes différents, modifiez /etc/shorewall/routestopped en un ensemble d'hôtes différents, modifiez /etc/shorewall/routestopped en conséquence.</p>
conséquence.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">ATTENTION: Si vous êtes connecté à votre firewall depuis Internet, <p align="left">ATTENTION: Si vous êtes connecté à votre firewall depuis
n'essayez pas une commande "shorewall stop" tant que vous n'avez pas ajouté Internet, n'essayez pas une commande "shorewall stop" tant que vous n'avez
une entrée pour votre adresse IP (celle à partir de laquelle vous êtes connectée) pas ajouté une entrée pour votre adresse IP (celle à partir de laquelle vous
dans <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. êtes connectée) dans <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
De la même manière, je ne vous recommande pas d'utiliser "shorewall restart"; De la même manière, je ne vous recommande pas d'utiliser "shorewall restart";
il est plus intéressant de créer une <i><a il est plus intéressant de créer une <i><a
href="configuration_file_basics.htm#Configs">configuration </a></i><i><a href="configuration_file_basics.htm#Configs">configuration </a></i><i><a
@ -1189,6 +1191,7 @@ dans <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002, 2003 <p align="left"><a href="copyright.htm"><font size="2">Copyright 2002, 2003
Thomas M. Eastep</font></a><br> Thomas M. Eastep</font></a><br>
</p> </p>
<br>
</body> </body>
</html> </html>

80
Shorewall-docs/traffic_shaping.htm
View File

@ -16,12 +16,10 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Traffic Shaping/Control</font></h1> <h1 align="center"><font color="#ffffff">Traffic Shaping/Control</font></h1>
</td> </td>
</tr> </tr>
@ -45,9 +43,9 @@ to be running Linux Kernel 2.4.18 or later.</p>
the setting of this variable determines whether Shorewall clears the traffic the setting of this variable determines whether Shorewall clears the traffic
shaping configuration during Shorewall [re]start and Shorewall stop. <br> shaping configuration during Shorewall [re]start and Shorewall stop. <br>
</li> </li>
<li><b>/etc/shorewall/tcrules</b> - A file where you can <li><b>/etc/shorewall/tcrules</b> - A file where you
specify firewall marking of packets. The firewall mark value may can specify firewall marking of packets. The firewall mark value
be used to classify packets for traffic shaping/control.<br> may be used to classify packets for traffic shaping/control.<br>
</li> </li>
<li><b>/etc/shorewall/tcstart </b>- A user-supplied file <li><b>/etc/shorewall/tcstart </b>- A user-supplied file
that is sourced by Shorewall during "shorewall start" and which that is sourced by Shorewall during "shorewall start" and which
@ -55,28 +53,28 @@ to be running Linux Kernel 2.4.18 or later.</p>
I have provided a <a I have provided a <a
href="ftp://ftp.shorewall.net/pub/shorewall/cbq">sample</a> that does href="ftp://ftp.shorewall.net/pub/shorewall/cbq">sample</a> that does
table-driven CBQ shaping but if you read the traffic shaping sections table-driven CBQ shaping but if you read the traffic shaping sections
of the HOWTO mentioned above, you can probably code your own of the HOWTO mentioned above, you can probably code your own faster
faster than you can learn how to use my sample. I personally use than you can learn how to use my sample. I personally use
<a href="http://luxik.cdi.cz/%7Edevik/qos/htb/">HTB</a> (see below). <a href="http://luxik.cdi.cz/%7Edevik/qos/htb/">HTB</a> (see below).
HTB support may eventually become an integral part of Shorewall HTB support may eventually become an integral part of Shorewall
since HTB is a lot simpler and better-documented than CBQ. As of since HTB is a lot simpler and better-documented than CBQ. As of 2.4.20,
2.4.20, HTB is a standard part of the kernel but iproute2 must be patched HTB is a standard part of the kernel but iproute2 must be patched in
in order to use it.<br> order to use it.<br>
<br> <br>
In tcstart, when you want to run the 'tc' utility, use In tcstart, when you want to run the 'tc' utility,
the run_tc function supplied by shorewall if you want tc errors use the run_tc function supplied by shorewall if you want tc errors
to stop the firewall.<br> to stop the firewall.<br>
<br> <br>
You can generally use off-the-shelf traffic shaping scripts by You can generally use off-the-shelf traffic shaping scripts by
simply copying them to /etc/shorewall/tcstart. I use <a simply copying them to /etc/shorewall/tcstart. I use <a
href="http://lartc.org/wondershaper/">The Wonder Shaper</a> (HTB version) href="http://lartc.org/wondershaper/">The Wonder Shaper</a> (HTB version)
that way (i.e., I just copied wshaper.htb to /etc/shorewall/tcstart and that way (i.e., I just copied wshaper.htb to /etc/shorewall/tcstart
modified it according to the Wonder Shaper README). <b>WARNING: </b>If and modified it according to the Wonder Shaper README). <b>WARNING: </b>If
you use use Masquerading or SNAT (i.e., you only have one external IP address) you use use Masquerading or SNAT (i.e., you only have one external IP address)
then listing internal hosts in the NOPRIOHOSTSRC variable in the wshaper[.htb] then listing internal hosts in the NOPRIOHOSTSRC variable in the wshaper[.htb]
script won't work. Traffic shaping occurs after SNAT has already been applied script won't work. Traffic shaping occurs after SNAT has already been
so when traffic shaping happens, all outbound traffic will have as a source applied so when traffic shaping happens, all outbound traffic will have
address the IP addresss of your firewall's external interface.<br> as a source address the IP addresss of your firewall's external interface.<br>
</li> </li>
<li><b>/etc/shorewall/tcclear</b> - A user-supplied file <li><b>/etc/shorewall/tcclear</b> - A user-supplied file
that is sourced by Shorewall when it is clearing traffic shaping. that is sourced by Shorewall when it is clearing traffic shaping.
@ -85,8 +83,8 @@ simply copying them to /etc/shorewall/tcstart. I use <a
</ul> </ul>
Shorewall allows you to start traffic shaping when Shorewall itself Shorewall allows you to start traffic shaping when Shorewall itself
starts or it allows you to bring up traffic shaping when you bring up starts or it allows you to bring up traffic shaping when you bring up your
your interfaces.<br> interfaces.<br>
<br> <br>
To start traffic shaping when Shorewall starts:<br> To start traffic shaping when Shorewall starts:<br>
@ -94,8 +92,8 @@ your interfaces.<br>
<li>Set TC_ENABLED=Yes and CLEAR_TC=Yes</li> <li>Set TC_ENABLED=Yes and CLEAR_TC=Yes</li>
<li>Supply an /etc/shorewall/tcstart script to configure your traffic <li>Supply an /etc/shorewall/tcstart script to configure your traffic
shaping rules.</li> shaping rules.</li>
<li>Optionally supply an /etc/shorewall/tcclear script to stop traffic <li>Optionally supply an /etc/shorewall/tcclear script to stop
shaping. That is usually unnecessary.</li> traffic shaping. That is usually unnecessary.</li>
<li>If your tcstart script uses the 'fwmark' classifier, you can <li>If your tcstart script uses the 'fwmark' classifier, you can
mark packets using entries in /etc/shorewall/tcrules.</li> mark packets using entries in /etc/shorewall/tcrules.</li>
@ -131,10 +129,10 @@ not be covered here. You then should:<br>
<p align="left">Normally, packet marking occurs in the PREROUTING chain before <p align="left">Normally, packet marking occurs in the PREROUTING chain before
any address rewriting takes place. This makes it impossible to mark inbound any address rewriting takes place. This makes it impossible to mark inbound
packets based on their destination address when SNAT or Masquerading are packets based on their destination address when SNAT or Masquerading
being used. Beginning with Shorewall 1.3.12, you can cause packet marking are being used. Beginning with Shorewall 1.3.12, you can cause packet
to occur in the FORWARD chain by using the MARK_IN_FORWARD_CHAIN option marking to occur in the FORWARD chain by using the MARK_IN_FORWARD_CHAIN
in <a href="Documentation.htm#Conf">shorewall.conf</a>.<br> option in <a href="Documentation.htm#Conf">shorewall.conf</a>.<br>
</p> </p>
<p align="left">Columns in the file are as follows:</p> <p align="left">Columns in the file are as follows:</p>
@ -142,18 +140,19 @@ not be covered here. You then should:<br>
<ul> <ul>
<li>MARK - Specifies the mark value is to be assigned <li>MARK - Specifies the mark value is to be assigned
in case of a match. This is an integer in the range 1-255. Beginning in case of a match. This is an integer in the range 1-255. Beginning
with Shorewall version 1.3.14, this value may be optionally followed by ":" with Shorewall version 1.3.14, this value may be optionally followed by
and either 'F' or 'P' to designate that the marking will occur in the FORWARD ":" and either 'F' or 'P' to designate that the marking will occur in the
or PREROUTING chains respectively. If this additional specification is omitted, FORWARD or PREROUTING chains respectively. If this additional specification
the chain used to mark packets will be determined by the setting of the is omitted, the chain used to mark packets will be determined by the setting
MARK_IN_FORWARD_CHAIN option in <a href="Documentation.htm#Conf">shorewall.conf</a>.<br> of the MARK_IN_FORWARD_CHAIN option in <a href="Documentation.htm#Conf">shorewall.conf</a>.<br>
<br> <br>
Example - 5<br> Example - 5<br>
</li> </li>
<li>SOURCE - The source of the packet. If the packet originates <li>SOURCE - The source of the packet. If the packet
on the firewall, place "fw" in this column. Otherwise, this is originates on the firewall, place "fw" in this column. Otherwise,
a comma-separated list of interface names, IP addresses, MAC addresses this is a comma-separated list of interface names, IP addresses, MAC
in <a href="Documentation.htm#MAC">Shorewall Format</a> and/or Subnets.<br> addresses in <a href="Documentation.htm#MAC">Shorewall Format</a> and/or
Subnets.<br>
<br> <br>
Examples<br> Examples<br>
    eth0<br>     eth0<br>
@ -166,9 +165,9 @@ list of IP addresses and/or subnets.<br>
from /etc/protocol, a number or "all"<br> from /etc/protocol, a number or "all"<br>
</li> </li>
<li>PORT(S) - Destination Ports. A comma-separated list <li>PORT(S) - Destination Ports. A comma-separated list
of Port names (from /etc/services), port numbers or port ranges of Port names (from /etc/services), port numbers or port ranges (e.g.,
(e.g., 21:22); if the protocol is "icmp", this column is interpreted 21:22); if the protocol is "icmp", this column is interpreted as
as the destination icmp type(s).<br> the destination icmp type(s).<br>
</li> </li>
<li>CLIENT PORT(S) - (Optional) Port(s) used by the client. <li>CLIENT PORT(S) - (Optional) Port(s) used by the client.
If omitted, any source port is acceptable. Specified as a comma-separate If omitted, any source port is acceptable. Specified as a comma-separate
@ -178,8 +177,8 @@ as the destination icmp type(s).<br>
<p align="left">Example 1 - All packets arriving on eth1 should be marked <p align="left">Example 1 - All packets arriving on eth1 should be marked
with 1. All packets arriving on eth2 and eth3 should be marked with with 1. All packets arriving on eth2 and eth3 should be marked with
2. All packets originating on the firewall itself should be marked 2. All packets originating on the firewall itself should be marked with
with 3.</p> 3.</p>
<table border="2" cellpadding="2" style="border-collapse: collapse;"> <table border="2" cellpadding="2" style="border-collapse: collapse;">
<tbody> <tbody>
@ -337,5 +336,6 @@ local systems or from my laptop or firewall).</li>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

72
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@ -14,7 +14,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -60,14 +60,14 @@
<blockquote> <blockquote>
<pre>Adding Common Rules<br>iptables: No chain/target/match by that name<br>Terminated<br></pre> <pre>Adding Common Rules<br>iptables: No chain/target/match by that name<br>Terminated<br></pre>
</blockquote> </blockquote>
A search through the trace for "No chain/target/match by that name" turned A search through the trace for "No chain/target/match by that name"
up the following:  turned up the following: 
<blockquote> <blockquote>
<pre>+ echo 'Adding Common Rules'<br>+ add_common_rules<br>+ run_iptables -A reject -p tcp -j REJECT --reject-with tcp-reset<br>++ echo -A reject -p tcp -j REJECT --reject-with tcp-reset<br>++ sed 's/!/! /g'<br>+ iptables -A reject -p tcp -j REJECT --reject-with tcp-reset<br>iptables: No chain/target/match by that name<br></pre> <pre>+ echo 'Adding Common Rules'<br>+ add_common_rules<br>+ run_iptables -A reject -p tcp -j REJECT --reject-with tcp-reset<br>++ echo -A reject -p tcp -j REJECT --reject-with tcp-reset<br>++ sed 's/!/! /g'<br>+ iptables -A reject -p tcp -j REJECT --reject-with tcp-reset<br>iptables: No chain/target/match by that name<br></pre>
</blockquote> </blockquote>
The command that failed was: "iptables -A reject -p tcp -j REJECT --reject-with The command that failed was: "iptables -A reject -p tcp -j REJECT --reject-with
tcp-reset". In this case, the user had compiled his own kernel and had forgotten tcp-reset". In this case, the user had compiled his own kernel and had
to include REJECT target support (see <a href="kernel.htm">kernel.htm</a>) forgotten to include REJECT target support (see <a href="kernel.htm">kernel.htm</a>)
<h3>Your network environment</h3> <h3>Your network environment</h3>
@ -78,8 +78,8 @@ an ill-conceived network setup. Here are several popular snafus: </p>
<li>Port Forwarding where client and server are <li>Port Forwarding where client and server are
in the same subnet. See <a href="FAQ.htm">FAQ 2.</a></li> in the same subnet. See <a href="FAQ.htm">FAQ 2.</a></li>
<li>Changing the IP address of a local system to be in the <li>Changing the IP address of a local system to be in the
external subnet, thinking that Shorewall will suddenly believe that external subnet, thinking that Shorewall will suddenly believe
the system is in the 'net' zone.</li> that the system is in the 'net' zone.</li>
<li>Multiple interfaces connected to the same HUB or Switch. <li>Multiple interfaces connected to the same HUB or Switch.
Given the way that the Linux kernel respond to ARP "who-has" requests, Given the way that the Linux kernel respond to ARP "who-has" requests,
this type of setup does NOT work the way that you expect it to.</li> this type of setup does NOT work the way that you expect it to.</li>
@ -89,10 +89,10 @@ the system is in the 'net' zone.</li>
<h3 align="left">If you are having connection problems:</h3> <h3 align="left">If you are having connection problems:</h3>
<p align="left">If the appropriate policy for the connection that you are <p align="left">If the appropriate policy for the connection that you are
trying to make is ACCEPT, please DO NOT ADD ADDITIONAL ACCEPT RULES TRYING trying to make is ACCEPT, please DO NOT ADD ADDITIONAL ACCEPT RULES
TO MAKE IT WORK. Such additional rules will NEVER make it work, they TRYING TO MAKE IT WORK. Such additional rules will NEVER make it work,
add clutter to your rule set and they represent a big security hole in they add clutter to your rule set and they represent a big security hole
the event that you forget to remove them later.</p> in the event that you forget to remove them later.</p>
<p align="left">I also recommend against setting all of your policies to <p align="left">I also recommend against setting all of your policies to
ACCEPT in an effort to make something work. That robs you of one of ACCEPT in an effort to make something work. That robs you of one of
@ -102,8 +102,8 @@ the event that you forget to remove them later.</p>
<p align="left">Check your log ("/sbin/shorewall show log"). If you don't <p align="left">Check your log ("/sbin/shorewall show log"). If you don't
see Shorewall messages, then your problem is probably NOT a Shorewall see Shorewall messages, then your problem is probably NOT a Shorewall
problem. If you DO see packet messages, it may be an indication that you problem. If you DO see packet messages, it may be an indication that
are missing one or more rules -- see <a href="FAQ.htm#faq17">FAQ 17</a>.</p> you are missing one or more rules -- see <a href="FAQ.htm#faq17">FAQ 17</a>.</p>
<p align="left">While you are troubleshooting, it is a good idea to clear <p align="left">While you are troubleshooting, it is a good idea to clear
two variables in /etc/shorewall/shorewall.conf:</p> two variables in /etc/shorewall/shorewall.conf:</p>
@ -123,9 +123,9 @@ the event that you forget to remove them later.</p>
<p align="left">Let's look at the important parts of this message:</p> <p align="left">Let's look at the important parts of this message:</p>
<ul> <ul>
<li>all2all:REJECT - This packet was REJECTed out of the all2all <li>all2all:REJECT - This packet was REJECTed out of the
chain -- the packet was rejected under the "all"-&gt;"all" REJECT all2all chain -- the packet was rejected under the "all"-&gt;"all"
policy (see <a href="FAQ.htm#faq17">FAQ 17).</a></li> REJECT policy (see <a href="FAQ.htm#faq17">FAQ 17).</a></li>
<li>IN=eth2 - the packet entered the firewall via eth2</li> <li>IN=eth2 - the packet entered the firewall via eth2</li>
<li>OUT=eth1 - if accepted, the packet would be sent on eth1</li> <li>OUT=eth1 - if accepted, the packet would be sent on eth1</li>
<li>SRC=192.168.2.2 - the packet was sent by 192.168.2.2</li> <li>SRC=192.168.2.2 - the packet was sent by 192.168.2.2</li>
@ -154,15 +154,15 @@ ping when you think that you shouldn't be allowed? Shorewall's 'Ping' Managemen
<ul> <ul>
<li>Seeing rejected/dropped packets logged out of the INPUT <li>Seeing rejected/dropped packets logged out of the INPUT
or FORWARD chains? This means that: or FORWARD chains? This means that:
<ol> <ol>
<li>your zone definitions are screwed up and the host that <li>your zone definitions are screwed up and the host that
is sending the packets or the destination host isn't in any zone is sending the packets or the destination host isn't in any zone
(using an <a href="Documentation.htm#Hosts">/etc/shorewall/hosts</a> (using an <a href="Documentation.htm#Hosts">/etc/shorewall/hosts</a>
file are you?); or</li> file are you?); or</li>
<li>the source and destination hosts are both connected <li>the source and destination hosts are both connected
to the same interface and you don't have a policy or rule for to the same interface and you don't have a policy or rule for the
the source zone to or from the destination zone.</li> source zone to or from the destination zone.</li>
</ol> </ol>
</li> </li>
@ -179,19 +179,19 @@ you have the following in /etc/shorewall/nat:<br>
    10.1.1.2    eth0    130.252.100.18<br>     10.1.1.2    eth0    130.252.100.18<br>
<br> <br>
and you ping 130.252.100.18, unless you have allowed icmp and you ping 130.252.100.18, unless you have allowed icmp
type 8 between the zone containing the system you are pinging from type 8 between the zone containing the system you are pinging from
and the zone containing 10.1.1.2, the ping requests will be dropped. </li> and the zone containing 10.1.1.2, the ping requests will be dropped. </li>
<li>If you specify "routefilter" for an interface, that <li>If you specify "routefilter" for an interface, that
interface must be up prior to starting the firewall.</li> interface must be up prior to starting the firewall.</li>
<li>Is your routing correct? For example, internal systems <li>Is your routing correct? For example, internal systems
usually need to be configured with their default gateway set to the usually need to be configured with their default gateway set to
IP address of their nearest firewall interface. One often overlooked the IP address of their nearest firewall interface. One often overlooked
aspect of routing is that in order for two hosts to communicate, the aspect of routing is that in order for two hosts to communicate,
routing between them must be set up <u>in both directions.</u> So when the routing between them must be set up <u>in both directions.</u>
setting up routing between <b>A</b> and<b> B</b>, be sure to verify So when setting up routing between <b>A</b> and<b> B</b>, be sure
that the route from <b>B</b> back to <b>A</b> is defined.</li> to verify that the route from <b>B</b> back to <b>A</b> is defined.</li>
<li>Some versions of LRP (EigerStein2Beta for example) have <li>Some versions of LRP (EigerStein2Beta for example) have
a shell with broken variable expansion. <a a shell with broken variable expansion. <a
href="ftp://ftp.shorewall.net/pub/shorewall/ash.gz"> You can get a corrected href="ftp://ftp.shorewall.net/pub/shorewall/ash.gz"> You can get a corrected
shell from the Shorewall Errata download site.</a> </li> shell from the Shorewall Errata download site.</a> </li>
<li>Do you have your kernel properly configured? <a <li>Do you have your kernel properly configured? <a
@ -199,12 +199,13 @@ a shell with broken variable expansion. <a
<li>Shorewall requires the "ip" program. That program <li>Shorewall requires the "ip" program. That program
is generally included in the "iproute" package which should be included is generally included in the "iproute" package which should be included
with your distribution (though many distributions don't install iproute with your distribution (though many distributions don't install iproute
by default). You may also download the latest source tarball from <a by default). You may also download the latest source tarball from
href="ftp://ftp.inr.ac.ru/ip-routing" target="_blank"> ftp://ftp.inr.ac.ru/ip-routing</a> <a href="ftp://ftp.inr.ac.ru/ip-routing" target="_blank"> ftp://ftp.inr.ac.ru/ip-routing</a>
.</li> .</li>
<li>Problems with NAT? Be sure that you let Shorewall <li>Problems with NAT? Be sure that you let
add all external addresses to be use with NAT unless you have set <a Shorewall add all external addresses to be use with NAT unless you
href="Documentation.htm#Aliases"> ADD_IP_ALIASES</a> =No in /etc/shorewall/shorewall.conf.</li> have set <a href="Documentation.htm#Aliases"> ADD_IP_ALIASES</a> =No
in /etc/shorewall/shorewall.conf.</li>
</ul> </ul>
@ -219,6 +220,7 @@ add all external addresses to be use with NAT unless you have set <a
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
© <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font><br> © <font size="2">2001, 2002 Thomas M. Eastep.</font></a></font><br>
</p> </p>
<br>
</body> </body>
</html> </html>

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@ -18,10 +18,11 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber5" style="border-collapse: collapse;" width="100%" id="AutoNumber5"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
<h1 align="center"><font color="#ffffff">Basic Two-Interface Firewall</font></h1> <h1 align="center"><font color="#ffffff">Basic Two-Interface Firewall</font></h1>
</td> </td>
</tr> </tr>
@ -34,12 +35,12 @@
and follow the documentation.</p> and follow the documentation.</p>
<p>This guide doesn't attempt to acquaint you with all of the features of <p>This guide doesn't attempt to acquaint you with all of the features of
Shorewall. It rather focuses on what is required to configure Shorewall. It rather focuses on what is required to configure Shorewall
Shorewall in its most common configuration:</p> in its most common configuration:</p>
<ul> <ul>
<li>Linux system used as a firewall/router for a small <li>Linux system used as a firewall/router for a
local network.</li> small local network.</li>
<li>Single public IP address.</li> <li>Single public IP address.</li>
<li>Internet connection through cable modem, DSL, <li>Internet connection through cable modem, DSL,
ISDN, Frame Relay, dial-up ...</li> ISDN, Frame Relay, dial-up ...</li>
@ -53,9 +54,9 @@ ISDN, Frame Relay, dial-up ...</li>
</p> </p>
<p><b>If you are running Shorewall under Mandrake 9.0 or later, you can easily <p><b>If you are running Shorewall under Mandrake 9.0 or later, you can easily
configure the above setup using the Mandrake "Internet Connection configure the above setup using the Mandrake "Internet Connection Sharing"
Sharing" applet. From the Mandrake Control Center, select "Network applet. From the Mandrake Control Center, select "Network &amp; Internet"
&amp; Internet" then "Connection Sharing".<br> then "Connection Sharing".<br>
</b></p> </b></p>
<p><b>Note however, that the Shorewall configuration produced by Mandrake <p><b>Note however, that the Shorewall configuration produced by Mandrake
@ -69,8 +70,8 @@ use the rest of this documentation (it has two local zones; "loc" and "masq"
</p> </p>
<p>Shorewall requires that you have the iproute/iproute2 package installed <p>Shorewall requires that you have the iproute/iproute2 package installed
(on RedHat, the package is called <i>iproute</i>)<i>. </i>You (on RedHat, the package is called <i>iproute</i>)<i>. </i>You can
can tell if this package is installed by the presence of an <b>ip</b> tell if this package is installed by the presence of an <b>ip</b>
program on your firewall system. As root, you can use the 'which' program on your firewall system. As root, you can use the 'which'
command to check for this program:</p> command to check for this program:</p>
@ -89,18 +90,18 @@ are marked with
<p><img border="0" src="images/j0213519.gif" width="60" height="60"> <p><img border="0" src="images/j0213519.gif" width="60" height="60">
    If you edit your configuration files on a Windows     If you edit your configuration files on a Windows
system, you must save them as Unix files if your editor supports system, you must save them as Unix files if your editor supports
that option or you must run them through dos2unix before trying that option or you must run them through dos2unix before trying to
to use them. Similarly, if you copy a configuration file from your use them. Similarly, if you copy a configuration file from your Windows
Windows hard drive to a floppy disk, you must run dos2unix against the hard drive to a floppy disk, you must run dos2unix against the copy
copy before using it with Shorewall.</p> before using it with Shorewall.</p>
<ul> <ul>
<li><a <li><a
href="http://www.simtel.net/pub/pd/51438.html">Windows Version of href="http://www.simtel.net/pub/pd/51438.html">Windows Version of
dos2unix</a></li> dos2unix</a></li>
<li><a <li><a
href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version of
of dos2unix</a></li> dos2unix</a></li>
</ul> </ul>
@ -108,14 +109,13 @@ of dos2unix</a></li>
<p> <img border="0" src="images/BD21298_.gif" width="13" height="13" <p> <img border="0" src="images/BD21298_.gif" width="13" height="13"
alt=""> alt="">
    The configuration files for Shorewall are contained in the     The configuration files for Shorewall are contained in
directory /etc/shorewall -- for simple setups, you will only need to the directory /etc/shorewall -- for simple setups, you will only need
deal with a few of these as described in this guide. After you have <a to deal with a few of these as described in this guide. After you have
href="Install.htm">installed Shorewall</a>, <b>download the <a <a href="Install.htm">installed Shorewall</a>, <b>download the <a
href="http://www1.shorewall.net/pub/shorewall/Samples/">two-interface sample</a>, href="http://www1.shorewall.net/pub/shorewall/Samples/">two-interface sample</a>,
un-tar it (tar -zxvf two-interfaces.tgz) and and copy the files un-tar it (tar -zxvf two-interfaces.tgz) and and copy the files to
to /etc/shorewall (these files will replace files with the same /etc/shorewall (these files will replace files with the same name).</b></p>
name).</b></p>
<p>As each file is introduced, I suggest that you look through the actual <p>As each file is introduced, I suggest that you look through the actual
file on your system -- each file contains detailed configuration file on your system -- each file contains detailed configuration
@ -169,8 +169,8 @@ name).</b></p>
or DROP  the request is first checked against the rules in /etc/shorewall/common or DROP  the request is first checked against the rules in /etc/shorewall/common
(the samples provide that file for you).</p> (the samples provide that file for you).</p>
<p>The /etc/shorewall/policy file included with the two-interface sample <p>The /etc/shorewall/policy file included with the two-interface sample has
has the following policies:</p> the following policies:</p>
<blockquote> <blockquote>
<table border="1" cellpadding="2" style="border-collapse: collapse;" <table border="1" cellpadding="2" style="border-collapse: collapse;"
@ -242,9 +242,10 @@ has the following policies:</p>
<li>allow all connection requests from your local <li>allow all connection requests from your local
network to the internet</li> network to the internet</li>
<li>drop (ignore) all connection requests from the <li>drop (ignore) all connection requests from the
internet to your firewall or local network</li> internet to your firewall or local network</li>
<li>optionally accept all connection requests from <li>optionally accept all connection requests from
the firewall to the internet (if you uncomment the additional policy)</li> the firewall to the internet (if you uncomment the additional
policy)</li>
<li>reject all other connection requests.</li> <li>reject all other connection requests.</li>
</ol> </ol>
@ -259,9 +260,9 @@ the firewall to the internet (if you uncomment the additional policy)<
height="635"> height="635">
</p> </p>
<p align="left">The firewall has two network interfaces. Where Internet connectivity <p align="left">The firewall has two network interfaces. Where Internet
is through a cable or DSL "Modem", the <i>External Interface</i> will be connectivity is through a cable or DSL "Modem", the <i>External Interface</i>
the ethernet adapter that is connected to that "Modem" (e.g., <b>eth0</b>)  will be the ethernet adapter that is connected to that "Modem" (e.g., <b>eth0</b>) 
<u>unless</u> you connect via <i><u>P</u>oint-to-<u>P</u>oint <u>P</u>rotocol <u>unless</u> you connect via <i><u>P</u>oint-to-<u>P</u>oint <u>P</u>rotocol
over <u>E</u>thernet</i> (PPPoE) or <i><u>P</u>oint-to-<u>P</u>oint over <u>E</u>thernet</i> (PPPoE) or <i><u>P</u>oint-to-<u>P</u>oint
<u>T</u>unneling <u>P</u>rotocol </i>(PPTP) in which case the External <u>T</u>unneling <u>P</u>rotocol </i>(PPTP) in which case the External
@ -276,17 +277,17 @@ ippp0</b>
href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf.</a></p> href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf.</a></p>
<p align="left">Your <i>Internal Interface</i> will be an ethernet adapter <p align="left">Your <i>Internal Interface</i> will be an ethernet adapter
(eth1 or eth0) and will be connected to a hub or switch. Your (eth1 or eth0) and will be connected to a hub or switch. Your other
other computers will be connected to the same hub/switch (note: computers will be connected to the same hub/switch (note: If you
If you have only a single internal system, you can connect the firewall have only a single internal system, you can connect the firewall
directly to the computer using a <i>cross-over </i> cable).</p> directly to the computer using a <i>cross-over </i> cable).</p>
<p align="left"><u><b> <img border="0" src="images/j0213519.gif" <p align="left"><u><b> <img border="0" src="images/j0213519.gif"
width="60" height="60"> width="60" height="60">
</b></u>Do not connect the internal and external interface </b></u>Do not connect the internal and external interface
to the same hub or switch (even for testing). It won't work the to the same hub or switch (even for testing). It won't work the way
way that you think that it will and you will end up confused and that you think that it will and you will end up confused and believing
believing that Shorewall doesn't work at all.</p> that Shorewall doesn't work at all.</p>
<p align="left"><img border="0" src="images/BD21298_.gif" align="left" <p align="left"><img border="0" src="images/BD21298_.gif" align="left"
width="13" height="13"> width="13" height="13">
@ -296,7 +297,7 @@ interface is <b>eth1</b>. If your configuration is different, you
will have to modify the sample <a will have to modify the sample <a
href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> file href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> file
accordingly. While you are there, you may wish to review the list accordingly. While you are there, you may wish to review the list
of options that are specified for the interfaces. Some hints:</p> of options that are specified for the interfaces. Some hints:</p>
<ul> <ul>
<li> <li>
@ -321,8 +322,8 @@ via the<i> Dynamic Host Configuration Protocol</i> (DHCP) or as part
of establishing your connection when you dial in (standard modem) or of establishing your connection when you dial in (standard modem) or
establish your PPP connection. In rare cases, your ISP may assign you establish your PPP connection. In rare cases, your ISP may assign you
a<i> static</i> IP address; that means that you configure your firewall's a<i> static</i> IP address; that means that you configure your firewall's
external interface to use that address permanently.<i> </i>However external interface to use that address permanently.<i> </i>However your
your external address is assigned, it will be shared by all of your systems external address is assigned, it will be shared by all of your systems
when you access the Internet. You will have to assign your own addresses when you access the Internet. You will have to assign your own addresses
in your internal network (the Internal Interface on your firewall plus in your internal network (the Internal Interface on your firewall plus
your other computers). RFC 1918 reserves several <i>Private </i>IP address your other computers). RFC 1918 reserves several <i>Private </i>IP address
@ -343,10 +344,10 @@ the external interface's entry in /etc/shorewall/interfaces.</p>
<div align="left"> <div align="left">
<p align="left">You will want to assign your addresses from the same <i> <p align="left">You will want to assign your addresses from the same <i>
sub-network </i>(<i>subnet)</i>.  For our purposes, we can consider a subnet sub-network </i>(<i>subnet)</i>.  For our purposes, we can consider a subnet
to consists of a range of addresses x.y.z.0 - x.y.z.255. Such to consists of a range of addresses x.y.z.0 - x.y.z.255. Such
a subnet will have a <i>Subnet Mask </i>of 255.255.255.0. The a subnet will have a <i>Subnet Mask </i>of 255.255.255.0. The address
address x.y.z.0 is reserved as the <i>Subnet Address</i> and x.y.z.255 x.y.z.0 is reserved as the <i>Subnet Address</i> and x.y.z.255
is reserved as the <i>Subnet Broadcast</i> <i>Address</i>. In Shorewall, is reserved as the <i>Subnet Broadcast</i> <i>Address</i>. In Shorewall,
a subnet is described using <a a subnet is described using <a
href="shorewall_setup_guide.htm#Subnets"><i>Classless InterDomain Routing href="shorewall_setup_guide.htm#Subnets"><i>Classless InterDomain Routing
@ -439,48 +440,48 @@ Routing",</i> Thomas A. Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.
don't forward packets which have an RFC-1918 destination address. don't forward packets which have an RFC-1918 destination address.
When one of your local systems (let's assume computer 1) sends a connection When one of your local systems (let's assume computer 1) sends a connection
request to an internet host, the firewall must perform <i>Network request to an internet host, the firewall must perform <i>Network
Address Translation </i>(NAT). The firewall rewrites the source Address Translation </i>(NAT). The firewall rewrites the source address
address in the packet to be the address of the firewall's external in the packet to be the address of the firewall's external interface;
interface; in other words, the firewall makes it look as if the firewall in other words, the firewall makes it look as if the firewall itself
itself is initiating the connection.  This is necessary so that the is initiating the connection.  This is necessary so that the destination
destination host will be able to route return packets back to the host will be able to route return packets back to the firewall (remember
firewall (remember that packets whose destination address is reserved that packets whose destination address is reserved by RFC 1918 can't
by RFC 1918 can't be routed across the internet so the remote host be routed across the internet so the remote host can't address its
can't address its response to computer 1). When the firewall receives response to computer 1). When the firewall receives a return packet,
a return packet, it rewrites the destination address back to 10.10.10.1 it rewrites the destination address back to 10.10.10.1 and forwards
and forwards the packet on to computer 1. </p> the packet on to computer 1. </p>
<p align="left">On Linux systems, the above process is often referred to <p align="left">On Linux systems, the above process is often referred to as<i>
as<i> IP Masquerading</i> but you will also see the term <i>Source Network IP Masquerading</i> but you will also see the term <i>Source Network Address
Address Translation </i>(SNAT) used. Shorewall follows the convention used Translation </i>(SNAT) used. Shorewall follows the convention used with
with Netfilter:</p> Netfilter:</p>
<ul> <ul>
<li> <li>
<p align="left"><i>Masquerade</i> describes the case where you let your <p align="left"><i>Masquerade</i> describes the case where you let your
firewall system automatically detect the external interface firewall system automatically detect the external interface address.
address. </p> </p>
</li> </li>
<li> <li>
<p align="left"><i>SNAT</i> refers to the case when you explicitly specify <p align="left"><i>SNAT</i> refers to the case when you explicitly specify
the source address that you want outbound packets from your the source address that you want outbound packets from your local
local network to use. </p> network to use. </p>
</li> </li>
</ul> </ul>
<p align="left">In Shorewall, both Masquerading and SNAT are configured with <p align="left">In Shorewall, both Masquerading and SNAT are configured with
entries in the /etc/shorewall/masq file. You will normally use entries in the /etc/shorewall/masq file. You will normally use
Masquerading if your external IP is dynamic and SNAT if the IP Masquerading if your external IP is dynamic and SNAT if the IP is
is static.</p> static.</p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
    If your external firewall interface is <b>eth0</b>,     If your external firewall interface is <b>eth0</b>,
you do not need to modify the file provided with the sample. Otherwise, you do not need to modify the file provided with the sample. Otherwise,
edit /etc/shorewall/masq and change the first column to the name edit /etc/shorewall/masq and change the first column to the name
of your external interface and the second column to the name of your of your external interface and the second column to the name of
internal interface.</p> your internal interface.</p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
@ -588,8 +589,8 @@ to rewrite the source address in the response.</p>
on computers 1 or 2 or on the firewall). If you want to be able on computers 1 or 2 or on the firewall). If you want to be able
to access your web server using the IP address of your external interface, to access your web server using the IP address of your external interface,
see <a href="FAQ.htm#faq2">Shorewall FAQ #2</a>.</li> see <a href="FAQ.htm#faq2">Shorewall FAQ #2</a>.</li>
<li>Many ISPs block incoming connection requests to <li>Many ISPs block incoming connection requests
port 80. If you have problems connecting to your web server, to port 80. If you have problems connecting to your web server,
try the following rule and try connecting to port 5000.</li> try the following rule and try connecting to port 5000.</li>
</ul> </ul>
@ -630,8 +631,8 @@ try the following rule and try connecting to port 5000.</li>
<p align="left">Normally, when you connect to your ISP, as part of getting <p align="left">Normally, when you connect to your ISP, as part of getting
an IP address your firewall's <i>Domain Name Service </i>(DNS) an IP address your firewall's <i>Domain Name Service </i>(DNS)
resolver will be automatically configured (e.g., the /etc/resolv.conf resolver will be automatically configured (e.g., the /etc/resolv.conf
file will be written). Alternatively, your ISP may have given you file will be written). Alternatively, your ISP may have given you the
the IP address of a pair of DNS <i> name servers</i> for you to manually IP address of a pair of DNS <i> name servers</i> for you to manually
configure as your primary and secondary name servers. Regardless of configure as your primary and secondary name servers. Regardless of
how DNS gets configured on your firewall, it is <u>your</u> responsibility how DNS gets configured on your firewall, it is <u>your</u> responsibility
to configure the resolver in your internal systems. You can take one to configure the resolver in your internal systems. You can take one
@ -651,15 +652,16 @@ file. </p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
    You can configure a<i> Caching Name Server </i>on     You can configure a<i> Caching Name Server </i>on
your firewall.<i> </i>Red Hat has an RPM for a caching name your firewall.<i> </i>Red Hat has an RPM for a caching name
server (the RPM also requires the 'bind' RPM) and for Bering users, server (the RPM also requires the 'bind' RPM) and for Bering users,
there is dnscache.lrp. If you take this approach, you configure your there is dnscache.lrp. If you take this approach, you configure
internal systems to use the firewall itself as their primary (and only) your internal systems to use the firewall itself as their primary
name server. You use the internal IP address of the firewall (10.10.10.254 (and only) name server. You use the internal IP address of the firewall
in the example above) for the name server address. To allow your (10.10.10.254 in the example above) for the name server address.
local systems to talk to your caching name server, you must open port To allow your local systems to talk to your caching name server,
53 (both UDP and TCP) from the local network to the firewall; you do you must open port 53 (both UDP and TCP) from the local network to the
that by adding the following rules in /etc/shorewall/rules. </p> firewall; you do that by adding the following rules in /etc/shorewall/rules.
</p>
</li> </li>
</ul> </ul>
@ -825,7 +827,8 @@ allowing all connections from the firewall to the internet.</p>
</div> </div>
<div align="left"> <div align="left">
<p align="left">Example - You want to run a Web Server on your firewall system:</p> <p align="left">Example - You want to run a Web Server on your firewall
system:</p>
</div> </div>
<div align="left"> <div align="left">
@ -868,8 +871,8 @@ allowing all connections from the firewall to the internet.</p>
<div align="left"> <div align="left">
<p align="left">Those two rules would of course be in addition to the rules <p align="left">Those two rules would of course be in addition to the rules
listed above under "You can configure a Caching Name Server listed above under "You can configure a Caching Name Server on
on your firewall"</p> your firewall"</p>
</div> </div>
<div align="left"> <div align="left">
@ -880,8 +883,7 @@ on your firewall"</p>
<div align="left"> <div align="left">
<p align="left"><b>Important: </b>I don't recommend enabling telnet to/from <p align="left"><b>Important: </b>I don't recommend enabling telnet to/from
the internet because it uses clear text (even for login!). If the internet because it uses clear text (even for login!). If
you want shell access to your firewall from the internet, use you want shell access to your firewall from the internet, use SSH:</p>
SSH:</p>
</div> </div>
<div align="left"> <div align="left">
@ -965,7 +967,7 @@ SSH:</p>
<p align="left"><br> <p align="left"><br>
<img border="0" src="images/BD21298_.gif" width="13" height="13"> <img border="0" src="images/BD21298_.gif" width="13" height="13">
    Now edit your /etc/shorewall/rules file to add     Now edit your /etc/shorewall/rules file to add
or delete other connections as required.</p> or delete other connections as required.</p>
</div> </div>
<div align="left"> <div align="left">
@ -975,12 +977,12 @@ or delete other connections as required.</p>
<div align="left"> <div align="left">
<p align="left"> <img border="0" src="images/BD21298_2.gif" <p align="left"> <img border="0" src="images/BD21298_2.gif"
width="13" height="13" alt="Arrow"> width="13" height="13" alt="Arrow">
    The <a href="Install.htm">installation procedure </a>     The <a href="Install.htm">installation procedure
configures your system to start Shorewall at system boot  but beginning </a> configures your system to start Shorewall at system boot 
with Shorewall version 1.3.9 startup is disabled so that your system but beginning with Shorewall version 1.3.9 startup is disabled so
won't try to start Shorewall before configuration is complete. Once that your system won't try to start Shorewall before configuration
you have completed configuration of your firewall, you can enable Shorewall is complete. Once you have completed configuration of your firewall,
startup by removing the file /etc/shorewall/startup_disabled.<br> you can enable Shorewall startup by removing the file /etc/shorewall/startup_disabled.<br>
</p> </p>
<p align="left"><font color="#ff0000"><b>IMPORTANT</b>: </font><font <p align="left"><font color="#ff0000"><b>IMPORTANT</b>: </font><font
@ -1003,7 +1005,7 @@ from your Netfilter configuration, use "shorewall clear".</p>
<p align="left"><img border="0" src="images/BD21298_.gif" width="13" <p align="left"><img border="0" src="images/BD21298_.gif" width="13"
height="13"> height="13">
    The two-interface sample assumes that you want to     The two-interface sample assumes that you want to
enable routing to/from <b>eth1 </b>(the local network) when Shorewall enable routing to/from <b>eth1 </b>(the local network) when Shorewall
is stopped. If your local network isn't connected to <b>eth1</b> or is stopped. If your local network isn't connected to <b>eth1</b> or
if you wish to enable access to/from other hosts, change /etc/shorewall/routestopped if you wish to enable access to/from other hosts, change /etc/shorewall/routestopped
accordingly.</p> accordingly.</p>
@ -1027,5 +1029,6 @@ from to <a href="Documentation.htm#Routestopped">/etc/shorewall/routestoppe
Thomas M. Eastep</font></a><br> Thomas M. Eastep</font></a><br>
</p> </p>
<br> <br>
<br>
</body> </body>
</html> </html>

503
Shorewall-docs/two-interface_fr.html
View File

@ -20,11 +20,8 @@
</head> </head>
<body lang="fr-FR"> <body lang="fr-FR">
<p style="margin-bottom: 0cm;"><a name="AutoNumber5"></a><br>
</p>
<table width="100%" border="0" cellpadding="0" cellspacing="0" <table width="100%" border="0" cellpadding="0" cellspacing="0"
bgcolor="#400169"> bgcolor="#3366ff">
<tbody> <tbody>
<tr> <tr>
<td width="100%" height="90"> <td width="100%" height="90">
@ -41,25 +38,25 @@
<small><i><u>Notes du traducteur</u> :<br> <small><i><u>Notes du traducteur</u> :<br>
Je ne pr&eacute;tends pas &ecirc;tre un vrai traducteur dans le sens ou Je ne pr&eacute;tends pas &ecirc;tre un vrai traducteur dans le sens ou
mon travail n&#8217;est pas des plus pr&eacute;cis (loin de l&agrave;...). Je ne mon travail n&#8217;est pas des plus pr&eacute;cis (loin de l&agrave;...). Je ne
me suis pas attach&eacute; &agrave; une traduction exacte du texte, mais me suis pas attach&eacute; &agrave; une traduction exacte du texte, mais plut&ocirc;t
plut&ocirc;t &agrave; en faire une version fran&ccedil;aise intelligible &agrave; en faire une version fran&ccedil;aise intelligible par tous (et
par tous (et par moi). Les termes techniques sont la plupart du temps conserv&eacute;s par moi). Les termes techniques sont la plupart du temps conserv&eacute;s
sous leur forme originale et mis entre parenth&egrave;ses car vous pouvez sous leur forme originale et mis entre parenth&egrave;ses car vous pouvez
les retrouver dans le reste des documentations ainsi que dans les fichiers les retrouver dans le reste des documentations ainsi que dans les fichiers
de configuration. N&#8217;h&eacute;sitez pas &agrave; me contacter afin d&#8217;am&eacute;liorer de configuration. N&#8217;h&eacute;sitez pas &agrave; me contacter afin d&#8217;am&eacute;liorer
ce document <a href="mailto:vetsel.patrice@wanadoo.fr">VETSEL Patrice</a> ce document <a href="mailto:vetsel.patrice@wanadoo.fr">VETSEL Patrice</a>
(merci &agrave; JMM pour sa relecture et ses commentaires pertinents, ainsi (merci &agrave; JMM pour sa relecture et ses commentaires pertinents, ainsi
qu'&agrave; Tom EASTEP pour son formidable outil et sa disponibilit&eacute;)</i></small><i>.<br> qu'&agrave; Tom EASTEP pour son formidable outil et sa disponibilit&eacute;)</i></small><i>.<br>
<br> <br>
</i></p> </i></p>
<p align="left">Mettre en place un syst&egrave;me Linux en tant que firewall <p align="left">Mettre en place un syst&egrave;me Linux en tant que firewall
pour un petit r&eacute;seau est une chose assez simple, si vous comprenez pour un petit r&eacute;seau est une chose assez simple, si vous comprenez
les bases et suivez la documentation.</p> les bases et suivez la documentation.</p>
<p>Ce guide ne veut pas vous apprendre tous les rouages de Shorewall. Il se <p>Ce guide ne veut pas vous apprendre tous les rouages de Shorewall. Il
focalise sur ce qui est n&eacute;cessaire pour configurer Shorewall, dans se focalise sur ce qui est n&eacute;cessaire pour configurer Shorewall, dans
son utilisation la plus courante :</p> son utilisation la plus courante :</p>
<ul> <ul>
<li> <li>
@ -71,7 +68,7 @@ son utilisation la plus courante :</p>
</li> </li>
<li> <li>
<p>Une connexion Internet par le biais d'un modem c&acirc;ble, ADSL, <p>Une connexion Internet par le biais d'un modem c&acirc;ble, ADSL,
ISDN, "Frame Relay", RTC ... </p> ISDN, "Frame Relay", RTC ... </p>
</li> </li>
</ul> </ul>
@ -83,36 +80,36 @@ ISDN, "Frame Relay", RTC ... </p>
</p> </p>
<p><b>Si vous faites tourner Shorewall sous Mandrake 9.0 ou plus r&eacute;cent, <p><b>Si vous faites tourner Shorewall sous Mandrake 9.0 ou plus r&eacute;cent,
vous pouvez facilement r&eacute;aliser la configuration ci-dessus en utilisant vous pouvez facilement r&eacute;aliser la configuration ci-dessus en utilisant
l'applet Mandrake "Internet Connection Sharing". Depuis le "Mandrake Control l'applet Mandrake "Internet Connection Sharing". Depuis le "Mandrake Control
Center", s&eacute;lectionnez "Network &amp; Internet" et "Connection Sharing". Center", s&eacute;lectionnez "Network &amp; Internet" et "Connection Sharing".
Vous ne devriez pas avoir besoin de vous r&eacute;f&eacute;rer &agrave; ce Vous ne devriez pas avoir besoin de vous r&eacute;f&eacute;rer &agrave;
guide.</b></p> ce guide.</b></p>
<p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'install&eacute;.<i> <p>Ce guide suppose que vous avez le paquet iproute/iproute2 d'install&eacute;.<i>
</i>Vous pouvez voir si le paquet est install&eacute; en v&eacute;rifiant </i>Vous pouvez voir si le paquet est install&eacute; en v&eacute;rifiant
la pr&eacute;sence du programme ip sur votre syst&egrave;me de firewall. Sous la pr&eacute;sence du programme ip sur votre syst&egrave;me de firewall.
root, utilisez la commande 'which' pour rechercher le programme :</p> Sous root, utilisez la commande 'which' pour rechercher le programme :</p>
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre> <pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
<p>Je vous recommande dans un premier temps de parcourir tout le guide pour <p>Je vous recommande dans un premier temps de parcourir tout le guide pour
vous familiariser avec ce qui va se passer, et de revenir au d&eacute;but vous familiariser avec ce qui va se passer, et de revenir au d&eacute;but
en effectuant le changements dans votre configuration. Les points o&ugrave;, en effectuant le changements dans votre configuration. Les points o&ugrave;,
les changements dans la configuration sont recommand&eacute;es, sont signal&eacute;s les changements dans la configuration sont recommand&eacute;es, sont signal&eacute;s
par une <img src="images/BD21298_.gif" name="Image2" align="bottom" par une <img src="images/BD21298_.gif" name="Image2" align="bottom"
width="13" height="13" border="0"> width="13" height="13" border="0">
.</p> .</p>
<p><img src="images/j0213519.gif" name="Image3" align="bottom" <p><img src="images/j0213519.gif" name="Image3" align="bottom"
width="60" height="60" border="0"> width="60" height="60" border="0">
&nbsp;&nbsp;&nbsp; Si vous &eacute;ditez vos fichiers de configuration sur &nbsp;&nbsp;&nbsp; Si vous &eacute;ditez vos fichiers de configuration
un syst&egrave;me Windows, vous devez les sauver comme des fichiers Unix si sur un syst&egrave;me Windows, vous devez les sauver comme des fichiers
votre &eacute;diteur offre cette option sinon vous devez les faire passer Unix si votre &eacute;diteur offre cette option sinon vous devez les faire
par dos2unix avant d'essayer de les utiliser. De la m&ecirc;me mani&egrave;re, passer par dos2unix avant d'essayer de les utiliser. De la m&ecirc;me mani&egrave;re,
si vous copiez un fichier de configuration depuis votre disque dur Windows si vous copiez un fichier de configuration depuis votre disque dur Windows
vers une disquette, vous devez lancer dos2unix sur la copie avant de l'utiliser vers une disquette, vous devez lancer dos2unix sur la copie avant de l'utiliser
avec Shorewall.</p> avec Shorewall.</p>
<ul> <ul>
<li> <li>
@ -122,7 +119,7 @@ avec Shorewall.</p>
</li> </li>
<li> <li>
<p><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version <p><a href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version
of dos2unix</a> </p> of dos2unix</a> </p>
</li> </li>
</ul> </ul>
@ -132,22 +129,22 @@ of dos2unix</a> </p>
<p><img src="images/BD21298_.gif" name="Image4" align="bottom" <p><img src="images/BD21298_.gif" name="Image4" align="bottom"
width="13" height="13" border="0"> width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Les fichiers de configuration pour Shorewall sont dans &nbsp;&nbsp;&nbsp; Les fichiers de configuration pour Shorewall sont dans
le r&eacute;pertoire /etc/shorewall -- pour de simples configurations, vous le r&eacute;pertoire /etc/shorewall -- pour de simples configurations, vous
n'aurez seulement &agrave; faire qu'avec quelques fichiers comme d&eacute;crit n'aurez seulement &agrave; faire qu'avec quelques fichiers comme d&eacute;crit
dans ce guide. Apr&egrave;s avoir <a href="Install.htm">install&eacute; dans ce guide. Apr&egrave;s avoir <a href="Install.htm">install&eacute; Shorewall</a>,
Shorewall</a>, t&eacute;l&eacute; chargez<b> le <a t&eacute;l&eacute; chargez<b> le <a
href="http://www1.shorewall.net/pub/shorewall/Samples/">two-interface sample</a>, href="http://www1.shorewall.net/pub/shorewall/Samples/">two-interface sample</a>,
un-tarez le (tar -zxvf two-interfaces.tgz) et copiez les fichiers vers /etc/shorewall un-tarez le (tar -zxvf two-interfaces.tgz) et copiez les fichiers vers /etc/shorewall
(ces fichiers remplaceront les fichiers de m&ecirc;me nom).</b></p> (ces fichiers remplaceront les fichiers de m&ecirc;me nom).</b></p>
<p>Parall&egrave;lement &agrave; la pr&eacute;sentation de chacun des fichiers, <p>Parall&egrave;lement &agrave; la pr&eacute;sentation de chacun des fichiers,
je vous sugg&egrave;re de regarder le fichier qui se trouve r&eacute;ellement je vous sugg&egrave;re de regarder le fichier qui se trouve r&eacute;ellement
sur votre syst&egrave;me -- tous les fichiers contiennent des instructions sur votre syst&egrave;me -- tous les fichiers contiennent des instructions
de configuration d&eacute;taill&eacute;es et des valeurs par d&eacute;faut.</p> de configuration d&eacute;taill&eacute;es et des valeurs par d&eacute;faut.</p>
<p>Shorewall voit le r&eacute;seau o&ugrave; il tourne, comme un ensemble <p>Shorewall voit le r&eacute;seau o&ugrave; il tourne, comme un ensemble
de <i>zones.</i> Dans une configuration avec deux interfaces, les noms des de <i>zones.</i> Dans une configuration avec deux interfaces, les noms des
zones suivantes sont utilis&eacute;s:</p> zones suivantes sont utilis&eacute;s:</p>
<a name="AutoNumber2"></a> <a name="AutoNumber2"></a>
<table border="0" cellpadding="3" cellspacing="0"> <table border="0" cellpadding="3" cellspacing="0">
<tbody> <tbody>
@ -183,35 +180,35 @@ zones suivantes sont utilis&eacute;s:</p>
href="Documentation.htm#Zones">/etc/shorewall/zones</a> .</p> href="Documentation.htm#Zones">/etc/shorewall/zones</a> .</p>
<p>Shorewall reconna&icirc;t aussi le syst&egrave;me de firewall comme sa <p>Shorewall reconna&icirc;t aussi le syst&egrave;me de firewall comme sa
propre zone - par d&eacute;faut, le firewall est connu comme<b> fw.</b></p> propre zone - par d&eacute;faut, le firewall est connu comme<b> fw.</b></p>
<p>Les r&egrave;gles &agrave; propos de quel trafic autoriser, et de quel <p>Les r&egrave;gles &agrave; propos de quel trafic autoriser, et de quel
trafic interdire sont exprim&eacute;es en terme de zones.</p> trafic interdire sont exprim&eacute;es en terme de zones.</p>
<ul> <ul>
<li> <li>
<p style="margin-bottom: 0cm;">Vous exprimez votre politique par d&eacute;faut <p style="margin-bottom: 0cm;">Vous exprimez votre politique par d&eacute;faut
pour les connexions d'une zone vers une autre zone dans le fichier<a pour les connexions d'une zone vers une autre zone dans le fichier<a
href="Documentation.htm#Policy"> /etc/shorewall/policy </a>. </p> href="Documentation.htm#Policy"> /etc/shorewall/policy </a>. </p>
</li> </li>
<li> <li>
<p>Vous d&eacute;finissez les exceptions &agrave; ces politiques pas <p>Vous d&eacute;finissez les exceptions &agrave; ces politiques pas
d&eacute;faut dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules d&eacute;faut dans le fichier <a href="Documentation.htm#Rules">/etc/shorewall/rules
</a>. </p> </a>. </p>
</li> </li>
</ul> </ul>
<p>Pour chaque connexion demandant &agrave; entrer dans le firewall, la requ&ecirc;te <p>Pour chaque connexion demandant &agrave; entrer dans le firewall, la requ&ecirc;te
est en premier lieu compar&eacute;e par rapport au fichier /etc/shorewall/rules. est en premier lieu compar&eacute;e par rapport au fichier /etc/shorewall/rules.
Si aucune r&egrave;gle dans ce fichier ne correspond &agrave; la demande de Si aucune r&egrave;gle dans ce fichier ne correspond &agrave; la demande
connexion alors la premi&egrave;re politique dans le fichier /etc/shorewall/policy de connexion alors la premi&egrave;re politique dans le fichier /etc/shorewall/policy
qui y correspond sera appliqu&eacute;e. Si cette politique est REJECT ou DROP&nbsp; qui y correspond sera appliqu&eacute;e. Si cette politique est REJECT ou
la requ&ecirc;te est dans un premier temps compar&eacute;e par rapport aux DROP&nbsp; la requ&ecirc;te est dans un premier temps compar&eacute;e par
r&egrave;gles contenues dans /etc/shorewall/common.</p> rapport aux r&egrave;gles contenues dans /etc/shorewall/common.</p>
<p>Le fichier /etc/shorewall/policy inclue dans l'archive d'exemple (two-interface) <p>Le fichier /etc/shorewall/policy inclue dans l'archive d'exemple (two-interface)
a les politiques suivantes:</p> a les politiques suivantes:</p>
<a name="AutoNumber3"></a> <a name="AutoNumber3"></a>
<dl> <dl>
<dd> <dd>
@ -291,10 +288,10 @@ a les politiques suivantes:</p>
</dd> </dd>
</dl> </dl>
<blockquote>Dans le fichier d'exemple (two-interface), la ligne suivante est <blockquote>Dans le fichier d'exemple (two-interface), la ligne suivante
inclue mais elle est comment&eacute;e. Si vous voulez que votre firewall puisse est inclue mais elle est comment&eacute;e. Si vous voulez que votre firewall
avoir un acc&egrave;s complet aux serveurs sur Internet, d&eacute;commentez puisse avoir un acc&egrave;s complet aux serveurs sur Internet, d&eacute;commentez
la ligne.</blockquote> la ligne.</blockquote>
<a name="AutoNumber31"></a> <a name="AutoNumber31"></a>
<dl> <dl>
<dd> <dd>
@ -345,17 +342,17 @@ la ligne.</blockquote>
<ol> <ol>
<li> <li>
<p style="margin-bottom: 0cm;">permettre toutes les demandes de connexion <p style="margin-bottom: 0cm;">permettre toutes les demandes de connexion
depuis votre r&eacute;seau local vers l'Internet </p> depuis votre r&eacute;seau local vers l'Internet </p>
</li> </li>
<li> <li>
<p style="margin-bottom: 0cm;">drop (ou ignorer) toutes les demandes <p style="margin-bottom: 0cm;">drop (ou ignorer) toutes les demandes
de connexion depuis l'Internet vers votre firewall ou votre r&eacute;seau de connexion depuis l'Internet vers votre firewall ou votre r&eacute;seau
local. </p> local. </p>
</li> </li>
<li> <li>
<p style="margin-bottom: 0cm;">Facultativement&nbsp;accepter toutes les <p style="margin-bottom: 0cm;">Facultativement&nbsp;accepter toutes les
demandes de connexion de votre firewall vers l'Internet (si vous avez d&eacute; demandes de connexion de votre firewall vers l'Internet (si vous avez
comment&eacute; la politique additionnelle) </p> d&eacute; comment&eacute; la politique additionnelle) </p>
</li> </li>
<li> <li>
<p>reject (rejeter) toutes les autres demandes de connexion. </p> <p>reject (rejeter) toutes les autres demandes de connexion. </p>
@ -366,7 +363,7 @@ comment&eacute; la politique additionnelle) </p>
<p><img src="images/BD21298_.gif" name="Image5" align="bottom" <p><img src="images/BD21298_.gif" name="Image5" align="bottom"
width="13" height="13" border="0"> width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; A ce point, &eacute;ditez votre fichier /etc/shorewall/policy &nbsp;&nbsp;&nbsp; A ce point, &eacute;ditez votre fichier /etc/shorewall/policy
et faite les changements que vous d&eacute;sirez.</p> et faite les changements que vous d&eacute;sirez.</p>
<h2 align="left">Network Interfaces</h2> <h2 align="left">Network Interfaces</h2>
@ -375,52 +372,54 @@ et faite les changements que vous d&eacute;sirez.</p>
</p> </p>
<p align="left">Le firewall a deux interfaces de r&eacute;seau. Lorsque la <p align="left">Le firewall a deux interfaces de r&eacute;seau. Lorsque la
connexion Internet passe par le c&acirc;ble ou par un ROUTEUR (pas un simple connexion Internet passe par le c&acirc;ble ou par un ROUTEUR (pas un simple
modem) ADSL (non USB), l'interface vers l'ext&eacute;rieur (<i>External Interface)</i> modem) ADSL (non USB), l'interface vers l'ext&eacute;rieur (<i>External
sera l'adaptateur sur lequel est connect&eacute; le routeur (e.g., <b>eth0</b>)&nbsp; Interface)</i> sera l'adaptateur sur lequel est connect&eacute; le routeur
<u>&agrave; moins que</u> vous ne vous connectiez par <i><u>P</u>oint-to-<u>P</u>oint<u>P</u>rotocol (e.g., <b>eth0</b>)&nbsp; <u>&agrave; moins que</u> vous ne vous connectiez
over<u>E</u>thernet</i> (PPPoE) ou par <i><u>P</u>oint-to-<u>P</u>oint<u>T</u>unneling<u>P</u>rotocol</i>(PPTP), par <i><u>P</u>oint-to-<u>P</u>oint<u>P</u>rotocol over<u>E</u>thernet</i>
(PPPoE) ou par <i><u>P</u>oint-to-<u>P</u>oint<u>T</u>unneling<u>P</u>rotocol</i>(PPTP),
dans ce cas l'interface ext&eacute;rieure sera une interface de type ppp dans ce cas l'interface ext&eacute;rieure sera une interface de type ppp
(e.g., <b>ppp0</b>). Si vous vous connectez par un simple modem (RTC), votre (e.g., <b>ppp0</b>). Si vous vous connectez par un simple modem (RTC), votre
interface ext&eacute;rieure sera aussi <b>ppp0</b>. Si votre connexion passe interface ext&eacute;rieure sera aussi <b>ppp0</b>. Si votre connexion passe
par Num&eacute;ris (ISDN), votre interface ext&eacute;rieure sera<b>ippp0.</b></p> par Num&eacute;ris (ISDN), votre interface ext&eacute;rieure sera<b>ippp0.</b></p>
<p align="left"><img src="images/BD21298_1.gif" name="Image7" <p align="left"><img src="images/BD21298_1.gif" name="Image7"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Si votre interface vers l'ext&eacute;rieur est<b>ppp0</b> &nbsp;&nbsp;&nbsp; Si votre interface vers l'ext&eacute;rieur est<b>ppp0</b>
ou <b>ippp0</b>&nbsp; alors vous mettrez CLAMPMSS=yes dans <a ou <b>ippp0</b>&nbsp; alors vous mettrez CLAMPMSS=yes dans <a
href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a></p> href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a></p>
<p align="left">Votre <i>Internal Interface</i> (interface vers votre r&eacute;seau <p align="left">Votre <i>Internal Interface</i> (interface vers votre r&eacute;seau
local -&gt; LAN) sera un adaptateur Ethernet (eth1 ou eth0) et sera connect&eacute;e local -&gt; LAN) sera un adaptateur Ethernet (eth1 ou eth0) et sera connect&eacute;e
&agrave; un hub ou switch (ou un PC avec un c&acirc;ble crois&eacute;). Vos &agrave; un hub ou switch (ou un PC avec un c&acirc;ble crois&eacute;).
autres ordinateurs seront connect&eacute;s &agrave; ce m&ecirc;me hub/switch</p> Vos autres ordinateurs seront connect&eacute;s &agrave; ce m&ecirc;me hub/switch</p>
<p align="left"><b><u><img src="images/j0213519.gif" name="Image8" <p align="left"><b><u><img src="images/j0213519.gif" name="Image8"
align="bottom" width="60" height="60" border="0"> align="bottom" width="60" height="60" border="0">
</u></b>Ne connectez pas l'interface interne et externe sur le m&ecirc;me </u></b>Ne connectez pas l'interface interne et externe sur le m&ecirc;me
hub ou switch (m&ecirc;me pour tester). Cela ne fonctionnera pas et ne croyez hub ou switch (m&ecirc;me pour tester). Cela ne fonctionnera pas et ne croyez
pas que ce soit shorewall qui ne marche pas.</p> pas que ce soit shorewall qui ne marche pas.</p>
<p align="left"><img src="images/BD21298_.gif" name="Image9" <p align="left"><img src="images/BD21298_.gif" name="Image9"
align="left" width="13" height="13" border="0"> align="left" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Le fichier de configuration d'exemple pour deux interfaces &nbsp;&nbsp;&nbsp; Le fichier de configuration d'exemple pour deux interfaces
suppose que votre interface externe est <b>eth0</b>et que l'interne est <b>eth1</b>. suppose que votre interface externe est <b>eth0</b>et que l'interne est
Si votre configuration est diff&eacute;rente, vous devrez modifier le fichier <b>eth1</b>. Si votre configuration est diff&eacute;rente, vous devrez modifier
<a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a> en cons&eacute;quence. le fichier <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>
Tant que vous y &ecirc;tes, vous pourriez parcourir la liste des options qui en cons&eacute;quence. Tant que vous y &ecirc;tes, vous pourriez parcourir
sont sp&eacute;cifi&eacute;es pour les interfaces. Quelques trucs:</p> la liste des options qui sont sp&eacute;cifi&eacute;es pour les interfaces.
Quelques trucs:</p>
<ul> <ul>
<li> <li>
<p align="left">Si votre interface vers l'ext&eacute;rieur est <b>ppp0</b> <p align="left">Si votre interface vers l'ext&eacute;rieur est <b>ppp0</b>
ou <b>ippp0</b>, vous pouvez remplacer le "detect" dans la seconde colonne ou <b>ippp0</b>, vous pouvez remplacer le "detect" dans la seconde colonne
par un "-". </p> par un "-". </p>
</li> </li>
<li> <li>
<p align="left">Si votre interface vers l'ext&eacute;rieur est&nbsp;<b>ppp0</b> <p align="left">Si votre interface vers l'ext&eacute;rieur est&nbsp;<b>ppp0</b>
ou <b>ippp0</b> ou si vous avez une adresse IP statique, vous pouvez enlever ou <b>ippp0</b> ou si vous avez une adresse IP statique, vous pouvez enlever
"dhcp" dans la liste des options. </p> "dhcp" dans la liste des options. </p>
</li> </li>
</ul> </ul>
@ -428,42 +427,42 @@ ou <b>ippp0</b> ou si vous avez une adresse IP statique, vous pouvez enlever
<h2 align="left">Adresses IP</h2> <h2 align="left">Adresses IP</h2>
<p align="left">Avant d'aller plus loin, nous devons dire quelques mots au <p align="left">Avant d'aller plus loin, nous devons dire quelques mots au
sujet de Internet Protocol (IP) <i>addresses</i>. Normalement, votre fournisseur sujet de Internet Protocol (IP) <i>addresses</i>. Normalement, votre fournisseur
Internet (ISP) vous assignera une seule adresse IP (single <i>Public</i>IP Internet (ISP) vous assignera une seule adresse IP (single <i>Public</i>IP
address). Cette adresse peut &ecirc;tre assign&eacute;e par le Dynamic<i> address). Cette adresse peut &ecirc;tre assign&eacute;e par le Dynamic<i>
Host Configuration Protocol</i>(DHCP) ou lors de l'&eacute;tablissement Host Configuration Protocol</i>(DHCP) ou lors de l'&eacute;tablissement de
de votre connexion lorsque vous vous connectez (modem standard) ou &eacute;tablissez votre connexion lorsque vous vous connectez (modem standard) ou &eacute;tablissez
votre connexion PPP. Dans de rares cas , votre provider peut vous assigner votre connexion PPP. Dans de rares cas , votre provider peut vous assigner
une adresse statique<i> (static</i>IP address); cela signifie que vous devez une adresse statique<i> (static</i>IP address); cela signifie que vous devez
configurer l'interface externe de votre firewall afin d'utiliser cette adresse configurer l'interface externe de votre firewall afin d'utiliser cette adresse
de mani&egrave;re permanente. Votre adresse externe assign&eacute;e, elle de mani&egrave;re permanente. Votre adresse externe assign&eacute;e, elle
va &ecirc;tre partag&eacute;e par tous vos syst&egrave;mes lors de l'acc&egrave;s va &ecirc;tre partag&eacute;e par tous vos syst&egrave;mes lors de l'acc&egrave;s
&agrave; Internet. Vous devrez assigner vos propres adresses dans votre &agrave; Internet. Vous devrez assigner vos propres adresses dans votre r&eacute;seau
r&eacute;seau local (votre interface interne sur le firewall &nbsp;ainsi local (votre interface interne sur le firewall &nbsp;ainsi que les autres
que les autres ordinateurs). La RFC 1918 r&eacute;serve plusieurs plages ordinateurs). La RFC 1918 r&eacute;serve plusieurs plages d'IP (<i>Private</i>IP
d'IP (<i>Private</i>IP address ranges) &agrave; cette fin :</p> address ranges) &agrave; cette fin :</p>
<pre style="text-align: left;"> 10.0.0.0 - 10.255.255.255an<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre> <pre style="text-align: left;"> 10.0.0.0 - 10.255.255.255an<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre>
<p align="left"><img src="images/BD21298_.gif" name="Image10" <p align="left"><img src="images/BD21298_.gif" name="Image10"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Avant de lancer Shorewall, vous devriez regarder l'adresse &nbsp;&nbsp;&nbsp; Avant de lancer Shorewall, vous devriez regarder l'adresse
IP de votre interface externe, et si elle est dans les plages pr&eacute;c&eacute;dentes, IP de votre interface externe, et si elle est dans les plages pr&eacute;c&eacute;dentes,
vous devriez enlever l'option 'norfc1918' dans la ligne concernant l'interface vous devriez enlever l'option 'norfc1918' dans la ligne concernant l'interface
externe dans le fichier /etc/shorewall/interfaces.</p> externe dans le fichier /etc/shorewall/interfaces.</p>
<p align="left">Vous devrez assigner vos adresses depuis le m&ecirc;me sous-r&eacute;seau <p align="left">Vous devrez assigner vos adresses depuis le m&ecirc;me sous-r&eacute;seau
(<i>sub-network/subnet)</i>. Pour ce faire, nous pouvons consid&eacute;rer (<i>sub-network/subnet)</i>. Pour ce faire, nous pouvons consid&eacute;rer
un sous-r&eacute;seau dans une plage d'adresses x.y.z.0 - x.y.z.255. Chaque un sous-r&eacute;seau dans une plage d'adresses x.y.z.0 - x.y.z.255. Chaque
sous-r&eacute;seau aura un masque (<i>Subnet Mask) </i>de 255.255.255.0. L'adresse sous-r&eacute;seau aura un masque (<i>Subnet Mask) </i>de 255.255.255.0.
x.y.z.0 est r&eacute;serv&eacute;e comme l'adresse de sous-r&eacute;seau (<i>Subnet L'adresse x.y.z.0 est r&eacute;serv&eacute;e comme l'adresse de sous-r&eacute;seau
Address) </i>et x.y.z.255 est r&eacute;serv&eacute;e en tant qu'adresse de (<i>Subnet Address) </i>et x.y.z.255 est r&eacute;serv&eacute;e en tant qu'adresse
broadcast (<i>Subnet Broadcast</i> <i>Address)</i>. Dans Shorewall, un sous-r&eacute;seau de broadcast (<i>Subnet Broadcast</i> <i>Address)</i>. Dans Shorewall, un
est d&eacute;crit en utilisant <a sous-r&eacute;seau est d&eacute;crit en utilisant <a
href="shorewall_setup_guide.htm#Subnets"><i>la notation Classless InterDomain href="shorewall_setup_guide.htm#Subnets"><i>la notation Classless InterDomain
Routing </i>(CIDR)</a> qui consiste en l'adresse du sous-r&eacute;seau suivie Routing </i>(CIDR)</a> qui consiste en l'adresse du sous-r&eacute;seau suivie
par "/24". Le "24" se r&eacute;f&egrave;re au nombre cons&eacute;cutif de par "/24". Le "24" se r&eacute;f&egrave;re au nombre cons&eacute;cutif de
bits marquant "1" dans la partie gauche du masque de sous-r&eacute;seau.</p> bits marquant "1" dans la partie gauche du masque de sous-r&eacute;seau.</p>
<p align="left">Un exemple de sous-r&eacute;seau (sub-network) :</p> <p align="left">Un exemple de sous-r&eacute;seau (sub-network) :</p>
<a name="AutoNumber1"></a> <a name="AutoNumber1"></a>
@ -510,98 +509,98 @@ bits marquant "1" dans la partie gauche du masque de sous-r&eacute;seau.</p>
</dl> </dl>
<p align="left">Il est de mise d'assigner l'interface interne (LAN) &agrave; <p align="left">Il est de mise d'assigner l'interface interne (LAN) &agrave;
la premi&egrave;re adresse utilisable du sous-r&eacute;seau (10.10.10.1 dans la premi&egrave;re adresse utilisable du sous-r&eacute;seau (10.10.10.1
l'exemple pr&eacute;c&eacute;dent) ou la derni&egrave;re adresse utilisable dans l'exemple pr&eacute;c&eacute;dent) ou la derni&egrave;re adresse utilisable
(10.10.10.254).</p> (10.10.10.254).</p>
<p align="left">L'un des buts d'un sous-r&eacute;seau est de permettre &agrave; <p align="left">L'un des buts d'un sous-r&eacute;seau est de permettre &agrave;
tous les ordinateurs dans le sous-r&eacute;seau de savoir avec quels autres tous les ordinateurs dans le sous-r&eacute;seau de savoir avec quels autres
ordinateurs ils peuvent communiquer directement. Pour communiquer avec des ordinateurs ils peuvent communiquer directement. Pour communiquer avec des
syst&egrave;mes en dehors du sous-r&eacute;seau, les ordinateurs envoient syst&egrave;mes en dehors du sous-r&eacute;seau, les ordinateurs envoient
des paquets &agrave; travers le gateway (routeur).</p> des paquets &agrave; travers le gateway (routeur).</p>
<p align="left"><img src="images/BD21298_1.gif" name="Image11" <p align="left"><img src="images/BD21298_1.gif" name="Image11"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Vos ordinateurs en local (ordinateur 1 et ordinateur &nbsp;&nbsp;&nbsp; Vos ordinateurs en local (ordinateur 1 et ordinateur
2 dans le diagramme) devraient &ecirc;tre configur&eacute;s avec leur passerelle 2 dans le diagramme) devraient &ecirc;tre configur&eacute;s avec leur passerelle
par d&eacute;faut<i> (default gateway</i>) pointant sur l'adresse IP de par d&eacute;faut<i> (default gateway</i>) pointant sur l'adresse IP de l'interface
l'interface interne du firewall.</p> interne du firewall.</p>
<p align="left">The foregoing short discussion barely scratches the surface <p align="left">The foregoing short discussion barely scratches the surface
regarding subnetting and routing. If you are interested in learning more about regarding subnetting and routing. If you are interested in learning more
IP addressing and routing, I highly recommend <i>"IP Fundamentals: What Everyone about IP addressing and routing, I highly recommend <i>"IP Fundamentals:
Needs to Know about Addressing &amp; Routing",</i> Thomas A. Maufer, Prentice-Hall, What Everyone Needs to Know about Addressing &amp; Routing",</i> Thomas A.
1999, ISBN 0-13-975483-0.</p> Maufer, Prentice-Hall, 1999, ISBN 0-13-975483-0.</p>
<p align="left">Le reste de ce guide assumera que vous avez configur&eacute; <p align="left">Le reste de ce guide assumera que vous avez configur&eacute;
votre r&eacute;seau comme montr&eacute; ci-dessous :</p> votre r&eacute;seau comme montr&eacute; ci-dessous :</p>
<p align="center"><img src="images/basics1.png" name="Image12" <p align="center"><img src="images/basics1.png" name="Image12"
align="bottom" width="444" height="635" border="0"> align="bottom" width="444" height="635" border="0">
</p> </p>
<p align="left">La passerelle par d&eacute;faut pour les ordinateurs 1 et <p align="left">La passerelle par d&eacute;faut pour les ordinateurs 1 et
2 devrait &ecirc;tre 10.10.10.254.</p> 2 devrait &ecirc;tre 10.10.10.254.</p>
<h2 align="left">IP Masquerading (SNAT)</h2> <h2 align="left">IP Masquerading (SNAT)</h2>
<p align="left">Les adresses r&eacute;serv&eacute;es par la RFC 1918 sont <p align="left">Les adresses r&eacute;serv&eacute;es par la RFC 1918 sont
parfois d&eacute;sign&eacute;es comme <i>non-routables</i> car les routeurs parfois d&eacute;sign&eacute;es comme <i>non-routables</i> car les routeurs
Internet (backbone) ne font pas circuler les paquets qui ont une adresse de Internet (backbone) ne font pas circuler les paquets qui ont une adresse
destination appartenant &agrave; la RFC-1918. Lorsqu'un de vos syst&egrave;mes de destination appartenant &agrave; la RFC-1918. Lorsqu'un de vos syst&egrave;mes
en local (supposons l'ordinateur1) demande une connexion &agrave; un serveur en local (supposons l'ordinateur1) demande une connexion &agrave; un serveur
par Internet, le firewall doit appliquer un NAT<i> (Network Address Translation)</i>. par Internet, le firewall doit appliquer un NAT<i> (Network Address Translation)</i>.
Le firewall r&eacute; &eacute;crit l'adresse source dans le paquet, et l'a Le firewall r&eacute; &eacute;crit l'adresse source dans le paquet, et l'a
remplace par l'adresse de l'interface externe du firewall; en d'autres mots, remplace par l'adresse de l'interface externe du firewall; en d'autres mots,
le firewall fait croire que c'est lui m&ecirc;me qui initie la connexion. le firewall fait croire que c'est lui m&ecirc;me qui initie la connexion.
Ceci est n&eacute;cessaire afin que l'h&ocirc;te de destination soit capable Ceci est n&eacute;cessaire afin que l'h&ocirc;te de destination soit capable
de renvoyer les paquets au firewall (souvenez vous que les paquets qui ont de renvoyer les paquets au firewall (souvenez vous que les paquets qui ont
pour adresse de destination, une adresse r&eacute;serv&eacute;e par la RFC pour adresse de destination, une adresse r&eacute;serv&eacute;e par la RFC
1918 ne pourront pas &ecirc;tre rout&eacute;s &agrave; travers Internet, donc 1918 ne pourront pas &ecirc;tre rout&eacute;s &agrave; travers Internet,
l'h&ocirc;te Internet ne pourra adresser sa r&eacute;ponse &agrave; l'ordinateur donc l'h&ocirc;te Internet ne pourra adresser sa r&eacute;ponse &agrave;
1). Lorsque le firewall re&ccedil;oit le paquet de r&eacute;ponse, il remet l'ordinateur 1). Lorsque le firewall re&ccedil;oit le paquet de r&eacute;ponse,
l'adresse de destination &agrave; 10.10.10.1 et fait passer le paquet vers il remet l'adresse de destination &agrave; 10.10.10.1 et fait passer le paquet
l'ordinateur 1. </p> vers l'ordinateur 1. </p>
<p align="left">Sur les syst&egrave;mes Linux, ce proc&eacute;d&eacute; est <p align="left">Sur les syst&egrave;mes Linux, ce proc&eacute;d&eacute; est
souvent appel&eacute; de l'<i>IP Masquerading</i> mais vous verrez aussi le souvent appel&eacute; de l'<i>IP Masquerading</i> mais vous verrez aussi
terme de <i>Source Network Address Translation </i>(SNAT) utilis&eacute;. le terme de <i>Source Network Address Translation </i>(SNAT) utilis&eacute;.
Shorewall suit la convention utilis&eacute;e avec Netfilter:</p> Shorewall suit la convention utilis&eacute;e avec Netfilter:</p>
<ul> <ul>
<li> <li>
<p align="left"><i>Masquerade</i> d&eacute;signe le cas ou vous laissez <p align="left"><i>Masquerade</i> d&eacute;signe le cas ou vous laissez
votre firewall d&eacute;tecter automatiquement l'adresse de l'interface externe. votre firewall d&eacute;tecter automatiquement l'adresse de l'interface
</p> externe. </p>
</li> </li>
<li> <li>
<p align="left"><i>SNAT</i> d&eacute;signe le cas o&ugrave; vous sp&eacute;cifiez <p align="left"><i>SNAT</i> d&eacute;signe le cas o&ugrave; vous sp&eacute;cifiez
explicitement l'adresse source des paquets sortant de votre r&eacute;seau explicitement l'adresse source des paquets sortant de votre r&eacute;seau
local. </p> local. </p>
</li> </li>
</ul> </ul>
<p align="left">Sous Shorewall, autant le Masquerading que le SNAT sont configur&eacute; <p align="left">Sous Shorewall, autant le Masquerading que le SNAT sont configur&eacute;
avec des entr&eacute;s dans le fichier /etc/shorewall/masq. Vous utiliserez avec des entr&eacute;s dans le fichier /etc/shorewall/masq. Vous utiliserez
normalement le Masquerading si votre adresse IP externe est dynamique, et normalement le Masquerading si votre adresse IP externe est dynamique, et
SNAT si elle est statique.</p> SNAT si elle est statique.</p>
<p align="left"><img src="images/BD21298_.gif" name="Image13" <p align="left"><img src="images/BD21298_.gif" name="Image13"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Si votre interface externe du firewall est <b>eth0</b>, &nbsp;&nbsp;&nbsp; Si votre interface externe du firewall est <b>eth0</b>,
vous n'avez pas besoin de modifier le fichier fourni avec l'exemple. Dans vous n'avez pas besoin de modifier le fichier fourni avec l'exemple. Dans
le cas contraire, &eacute;ditez /etc/shorewall/masq et changez la premi&egrave;re le cas contraire, &eacute;ditez /etc/shorewall/masq et changez la premi&egrave;re
colonne par le nom de votre interface externe, et la seconde colonne par le colonne par le nom de votre interface externe, et la seconde colonne par
nom de votre interface interne.</p> le nom de votre interface interne.</p>
<p align="left"><img src="images/BD21298_.gif" name="Image14" <p align="left"><img src="images/BD21298_.gif" name="Image14"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Si votre IP externe est statique, vous pouvez la mettre &nbsp;&nbsp;&nbsp; Si votre IP externe est statique, vous pouvez la mettre
dans la troisi&egrave;me colonne dans /etc/shorewall/masq si vous le d&eacute;sirez, dans la troisi&egrave;me colonne dans /etc/shorewall/masq si vous le d&eacute;sirez,
de toutes fa&ccedil;ons votre firewall fonctionnera bien si vous laissez cette de toutes fa&ccedil;ons votre firewall fonctionnera bien si vous laissez
colonne vide. Le fait de mettre votre IP statique dans la troisi&egrave;me cette colonne vide. Le fait de mettre votre IP statique dans la troisi&egrave;me
colonne permet un traitement des paquets sortant un peu plus efficace.<br> colonne permet un traitement des paquets sortant un peu plus efficace.<br>
<br> <br>
<img src="images/BD21298_.gif" name="Image15" align="bottom" <img src="images/BD21298_.gif" name="Image15" align="bottom"
width="13" height="13" border="0"> width="13" height="13" border="0">
@ -622,21 +621,21 @@ suivantes, si elles n'y sont pas faite les changements n&eacute;cessaires:</p>
<h2 align="left">Port Forwarding (DNAT)</h2> <h2 align="left">Port Forwarding (DNAT)</h2>
<p align="left">Un de nos buts est de , peut &ecirc;tre, faire tourner un <p align="left">Un de nos buts est de , peut &ecirc;tre, faire tourner un
ou plusieurs serveurs sur nos ordinateurs locaux. Parce que ces ordinateurs ou plusieurs serveurs sur nos ordinateurs locaux. Parce que ces ordinateurs
on une adresse RFC-1918, il n' est pas possible pour les clients sur Internet on une adresse RFC-1918, il n' est pas possible pour les clients sur Internet
de se connecter directement &agrave; eux. Il est n&eacute;cessaire &agrave; de se connecter directement &agrave; eux. Il est n&eacute;cessaire &agrave;
ces clients d'adresser leurs demandes de connexion au firewall qui r&eacute; ces clients d'adresser leurs demandes de connexion au firewall qui r&eacute;
&eacute;crit l'adresse de destination de votre serveur, et fait passer le &eacute;crit l'adresse de destination de votre serveur, et fait passer le
paquet &agrave; celui-ci. Lorsque votre serveur r&eacute;pond, le firewall paquet &agrave; celui-ci. Lorsque votre serveur r&eacute;pond, le firewall
applique automatiquement un SNAT pour r&eacute; &eacute;crire l'adresse source applique automatiquement un SNAT pour r&eacute; &eacute;crire l'adresse
dans la r&eacute;ponse.</p> source dans la r&eacute;ponse.</p>
<p align="left">Ce proc&eacute;d&eacute; est appel&eacute;<i> Port Forwarding</i> <p align="left">Ce proc&eacute;d&eacute; est appel&eacute;<i> Port Forwarding</i>
ou <i>Destination Network Address Translation</i>(DNAT). Vous configurez le ou <i>Destination Network Address Translation</i>(DNAT). Vous configurez
port forwarding en utilisant les r&egrave;gles DNAT dans le fichier /etc/shorewall/rules.</p> le port forwarding en utilisant les r&egrave;gles DNAT dans le fichier /etc/shorewall/rules.</p>
<p>La forme g&eacute;n&eacute;rale d'une simple r&egrave;gle de port forwarding <p>La forme g&eacute;n&eacute;rale d'une simple r&egrave;gle de port forwarding
dans /etc/shorewall/rules est:</p> dans /etc/shorewall/rules est:</p>
<a name="AutoNumber4"></a> <a name="AutoNumber4"></a>
<dl> <dl>
<dd> <dd>
@ -695,8 +694,8 @@ dans /etc/shorewall/rules est:</p>
</dl> </dl>
<p>Exemple - vous faites tourner un serveur Web sur l'ordinateur 2 et vous <p>Exemple - vous faites tourner un serveur Web sur l'ordinateur 2 et vous
voulez faire passer les requ&ecirc;tes TCP sur le port 80 &agrave; ce syst&egrave;me voulez faire passer les requ&ecirc;tes TCP sur le port 80 &agrave; ce syst&egrave;me
:</p> :</p>
<a name="AutoNumber41"></a> <a name="AutoNumber41"></a>
<dl> <dl>
<dd> <dd>
@ -759,17 +758,17 @@ voulez faire passer les requ&ecirc;tes TCP sur le port 80 &agrave; ce syst&egrav
<ul> <ul>
<li> <li>
<p style="margin-bottom: 0cm;">Vous devez tester la r&egrave;gle pr&eacute;c&eacute;dente <p style="margin-bottom: 0cm;">Vous devez tester la r&egrave;gle pr&eacute;c&eacute;dente
depuis un client &agrave; l'ext&eacute;rieur de votre r&eacute;seau local depuis un client &agrave; l'ext&eacute;rieur de votre r&eacute;seau local
(c.a.d., ne pas tester depuis un navigateur tournant sur l'ordinateur 1 ou (c.a.d., ne pas tester depuis un navigateur tournant sur l'ordinateur 1
2 ou sur le firewall). Si vous voulez avoir la possibilit&eacute; d'acc&eacute;der ou 2 ou sur le firewall). Si vous voulez avoir la possibilit&eacute; d'acc&eacute;der
&agrave; votre serveur web en utilisant l'adresse IP externe de votre firewall, &agrave; votre serveur web en utilisant l'adresse IP externe de votre firewall,
regardez <a href="FAQ.htm#faq2">Shorewall FAQ #2</a>. </p> regardez <a href="FAQ.htm#faq2">Shorewall FAQ #2</a>. </p>
</li> </li>
<li> <li>
<p>Quelques fournisseurs Internet (Provider/ISP) bloquent les requ&ecirc;tes <p>Quelques fournisseurs Internet (Provider/ISP) bloquent les requ&ecirc;tes
entrantes de connexion sur le port 80. Si vous avez des probl&egrave;mes entrantes de connexion sur le port 80. Si vous avez des probl&egrave;mes
&agrave; vous connecter &agrave; votre serveur web, essayez la r&egrave;gle &agrave; vous connecter &agrave; votre serveur web, essayez la r&egrave;gle
suivante et connectez vous sur le port 5000. </p> suivante et connectez vous sur le port 5000. </p>
</li> </li>
</ul> </ul>
@ -833,44 +832,45 @@ suivante et connectez vous sur le port 5000. </p>
<p><img src="images/BD21298_.gif" name="Image16" align="bottom" <p><img src="images/BD21298_.gif" name="Image16" align="bottom"
width="13" height="13" border="0"> width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; A ce point, modifiez /etc/shorewall/rules pour ajouter &nbsp;&nbsp;&nbsp; A ce point, modifiez /etc/shorewall/rules pour ajouter
les r&egrave;gles DNAT dont vous avez besoin.</p> les r&egrave;gles DNAT dont vous avez besoin.</p>
<h2 align="left">Domain Name Server (DNS)</h2> <h2 align="left">Domain Name Server (DNS)</h2>
<p align="left">Normalement, quand vous vous connectez &agrave; votre fournisseur <p align="left">Normalement, quand vous vous connectez &agrave; votre fournisseur
(ISP), une partie consiste &agrave; obtenir votre adresse IP, votre DNS pour (ISP), une partie consiste &agrave; obtenir votre adresse IP, votre DNS
le firewall (<i>Domain Name Service) </i>est configur&eacute; automatiquement pour le firewall (<i>Domain Name Service) </i>est configur&eacute; automatiquement
(c.a.d.,le fichier /etc/resolv.conf a &eacute;t&eacute; &eacute;crit). Il (c.a.d.,le fichier /etc/resolv.conf a &eacute;t&eacute; &eacute;crit). Il
arrive que votre provider vous donne une paire d'adresse IP pour les DNS<i> arrive que votre provider vous donne une paire d'adresse IP pour les DNS<i>
(name servers)</i> afin que vous configuriez manuellement votre serveur de (name servers)</i> afin que vous configuriez manuellement votre serveur
nom primaire et secondaire. La mani&egrave;re dont le DNS est configur&eacute; de nom primaire et secondaire. La mani&egrave;re dont le DNS est configur&eacute;
sur votre firewall est de <u>votre</u> responsabilit&eacute;. Vous pouvez sur votre firewall est de <u>votre</u> responsabilit&eacute;. Vous pouvez
proc&eacute;der d'une de ses deux fa&ccedil;ons :</p> proc&eacute;der d'une de ses deux fa&ccedil;ons :</p>
<ul> <ul>
<li> <li>
<p align="left">Vous pouvez configurer votre syst&egrave;me interne pour <p align="left">Vous pouvez configurer votre syst&egrave;me interne
utiliser les noms de serveurs de votre provider. Si votre fournisseur vous pour utiliser les noms de serveurs de votre provider. Si votre fournisseur
donne les adresses de leurs serveurs ou si ces adresses sont disponibles vous donne les adresses de leurs serveurs ou si ces adresses sont disponibles
sur leur site web, vous pouvez configurer votre syst&egrave;me interne afin sur leur site web, vous pouvez configurer votre syst&egrave;me interne
de les utiliser. Si cette information n' est pas disponible, regardez dans afin de les utiliser. Si cette information n' est pas disponible, regardez
/etc/resolv.conf sur votre firewall -- les noms des serveurs sont donn&eacute;s dans /etc/resolv.conf sur votre firewall -- les noms des serveurs sont
dans l'enregistrement "nameserver" dans ce fichier. </p> donn&eacute;s dans l'enregistrement "nameserver" dans ce fichier. </p>
</li> </li>
<li> <li>
<p align="left"><img src="images/BD21298_.gif" name="Image17" <p align="left"><img src="images/BD21298_.gif" name="Image17"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Vous pouvez configurer un cache dns<i> (Caching Name &nbsp;&nbsp;&nbsp; Vous pouvez configurer un cache dns<i> (Caching Name
Server) </i>sur votre firewall.<i> </i>Red Hat a un RPM pour mettre en cache Server) </i>sur votre firewall.<i> </i>Red Hat a un RPM pour mettre en
un serveur de nom (le RPM requis aussi le RPM 'bind') et pour les utilisateurs cache un serveur de nom (le RPM requis aussi le RPM 'bind') et pour les
de Bering, il y a dnscache.lrp. Si vous adoptez cette approche, vous configurez utilisateurs de Bering, il y a dnscache.lrp. Si vous adoptez cette approche,
votre syst&egrave;me interne pour utiliser le firewall lui m&ecirc;me comme vous configurez votre syst&egrave;me interne pour utiliser le firewall
&eacute;tant le seul serveur de nom primaire. Vous pouvez utiliser l'adresse lui m&ecirc;me comme &eacute;tant le seul serveur de nom primaire. Vous
IP interne du firewall (10.10.10.254 dans l'exemple) pour l'adresse de serveur pouvez utiliser l'adresse IP interne du firewall (10.10.10.254 dans l'exemple)
de nom. Pour permettre &agrave; vos syst&egrave;mes locaux de discuter avec pour l'adresse de serveur de nom. Pour permettre &agrave; vos syst&egrave;mes
votre serveur cache de nom, vous devez ouvrir le port 53 (UDP ET&nbsp; TCP) locaux de discuter avec votre serveur cache de nom, vous devez ouvrir le
sur le firewall vers le r&eacute;seau local; vous ferez ceci en ajoutant port 53 (UDP ET&nbsp; TCP) sur le firewall vers le r&eacute;seau local;
les r&egrave;gles suivantes dans /etc/shorewall/rules. </p> vous ferez ceci en ajoutant les r&egrave;gles suivantes dans /etc/shorewall/rules.
</p>
</li> </li>
</ul> </ul>
@ -957,7 +957,7 @@ les r&egrave;gles suivantes dans /etc/shorewall/rules. </p>
<h2 align="left">Autres Connexions</h2> <h2 align="left">Autres Connexions</h2>
<p align="left">Les fichiers exemples inclus dans l'archive (two-interface) <p align="left">Les fichiers exemples inclus dans l'archive (two-interface)
contiennent les r&egrave;gles suivantes :</p> contiennent les r&egrave;gles suivantes :</p>
<a name="AutoNumber44"></a> <a name="AutoNumber44"></a>
<dl> <dl>
<dd> <dd>
@ -1038,10 +1038,10 @@ contiennent les r&egrave;gles suivantes :</p>
</dd> </dd>
</dl> </dl>
<p align="left">Ces r&egrave;gles autorisent l'acc&egrave;s DNS &agrave; partir <p align="left">Ces r&egrave;gles autorisent l'acc&egrave;s DNS &agrave;
de votre firewall et peuvent &ecirc;tre enlev&eacute;es si vous avez d&eacute; partir de votre firewall et peuvent &ecirc;tre enlev&eacute;es si vous avez
comment&eacute; la ligne dans /etc/shorewall/policy autorisant toutes les d&eacute; comment&eacute; la ligne dans /etc/shorewall/policy autorisant
connexions depuis le firewall vers Internet.</p> toutes les connexions depuis le firewall vers Internet.</p>
<p align="left">Les exemples contiennent aussi :</p> <p align="left">Les exemples contiennent aussi :</p>
<a name="AutoNumber45"></a> <a name="AutoNumber45"></a>
@ -1102,11 +1102,12 @@ connexions depuis le firewall vers Internet.</p>
</dl> </dl>
<p align="left">Cette r&egrave;gle vous autorise &agrave; faire tourner un <p align="left">Cette r&egrave;gle vous autorise &agrave; faire tourner un
serveur SSH sur votre firewall et &agrave; vous y connecter depuis votre r&eacute;seau serveur SSH sur votre firewall et &agrave; vous y connecter depuis votre
local.</p> r&eacute;seau local.</p>
<p align="left">Si vous voulez permettre d'autres connexions entre votre firewall <p align="left">Si vous voulez permettre d'autres connexions entre votre
et d'autres syst&egrave;mes, la forme g&eacute;n&eacute;rale est :</p> firewall et d'autres syst&egrave;mes, la forme g&eacute;n&eacute;rale est
:</p>
<a name="AutoNumber46"></a> <a name="AutoNumber46"></a>
<dl> <dl>
<dd> <dd>
@ -1165,7 +1166,7 @@ et d'autres syst&egrave;mes, la forme g&eacute;n&eacute;rale est :</p>
</dl> </dl>
<p align="left">Exemple - Vous voulez faire tourner un serveur Web sur votre <p align="left">Exemple - Vous voulez faire tourner un serveur Web sur votre
firewall :</p> firewall :</p>
<a name="AutoNumber47"></a> <a name="AutoNumber47"></a>
<dl> <dl>
<dd> <dd>
@ -1247,17 +1248,17 @@ firewall :</p>
</dd> </dd>
</dl> </dl>
<p align="left">Ces deux r&egrave;gles bien s&ucirc;r viennent s'ajouter aux <p align="left">Ces deux r&egrave;gles bien s&ucirc;r viennent s'ajouter
r&egrave;gles d&eacute;crites pr&eacute;c&eacute;demment dans "Vous pouvez aux r&egrave;gles d&eacute;crites pr&eacute;c&eacute;demment dans "Vous pouvez
configurer un cache dns<i> (Caching Name Server) </i>sur votre firewall"</p> configurer un cache dns<i> (Caching Name Server) </i>sur votre firewall"</p>
<p align="left">Si vous ne savez pas quel port et quel protocole une application <p align="left">Si vous ne savez pas quel port et quel protocole une application
particuli&egrave;re utilise, regardez <a href="ports.htm">ici</a>.</p> particuli&egrave;re utilise, regardez <a href="ports.htm">ici</a>.</p>
<p align="left"><b>Important: </b>Je ne vous recommande pas de permettre le <p align="left"><b>Important: </b>Je ne vous recommande pas de permettre
telnet depuis ou vers Internet car il utilise du texte en clair (m&ecirc;me le telnet depuis ou vers Internet car il utilise du texte en clair (m&ecirc;me
pour le login et le mot de passe!). Si vous voulez un acc&egrave;s au shell pour le login et le mot de passe!). Si vous voulez un acc&egrave;s au shell
sur votre firewall depuis Internet, utilisez SSH :</p> sur votre firewall depuis Internet, utilisez SSH :</p>
<a name="AutoNumber48"></a> <a name="AutoNumber48"></a>
<dl> <dl>
<dd> <dd>
@ -1318,7 +1319,7 @@ sur votre firewall depuis Internet, utilisez SSH :</p>
<p align="left"><img src="images/BD21298_.gif" name="Image18" <p align="left"><img src="images/BD21298_.gif" name="Image18"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Maintenant &eacute;ditez votre fichier /etc/shorewall/rules &nbsp;&nbsp;&nbsp; Maintenant &eacute;ditez votre fichier /etc/shorewall/rules
pour ajouter ou supprimer les connexions voulues.</p> pour ajouter ou supprimer les connexions voulues.</p>
<h2 align="left">Lancer et Arr&ecirc;ter votre Firewall</h2> <h2 align="left">Lancer et Arr&ecirc;ter votre Firewall</h2>
@ -1326,37 +1327,38 @@ pour ajouter ou supprimer les connexions voulues.</p>
alt="Arrow" align="bottom" width="13" height="13" border="0"> alt="Arrow" align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; La&nbsp; <a href="Install.htm">proc&eacute;dure d'installation</a> &nbsp;&nbsp;&nbsp; La&nbsp; <a href="Install.htm">proc&eacute;dure d'installation</a>
configure votre syst&egrave;me pour lancer Shorewall au boot du syst&egrave;me, configure votre syst&egrave;me pour lancer Shorewall au boot du syst&egrave;me,
mais pour les d&eacute;butants sous Shorewall version 1.3.9, le lancement mais pour les d&eacute;butants sous Shorewall version 1.3.9, le lancement
est d&eacute;sactiv&eacute; tant que la configuration n' est pas finie. Une est d&eacute;sactiv&eacute; tant que la configuration n' est pas finie.
fois la configuration de votre firewall achev&eacute;e, vous pouvez permettre Une fois la configuration de votre firewall achev&eacute;e, vous pouvez
le lancement de Shorewall en enlevant le fichier /etc/shorewall/startup_disabled.</p> permettre le lancement de Shorewall en enlevant le fichier /etc/shorewall/startup_disabled.</p>
<p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Les utilisateurs des <p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Les utilisateurs
paquets .deb doivent &eacute;diter /etc/default/shorewall et mettre 'startup=1'.</font></p> des paquets .deb doivent &eacute;diter /etc/default/shorewall et mettre 'startup=1'.</font></p>
<p align="left">Le firewall est lanc&eacute; en utilisant la commande "shorewall <p align="left">Le firewall est lanc&eacute; en utilisant la commande "shorewall
start" et stopp&eacute; avec "shorewall stop". Lorsque le firewall est stopp&eacute;, start" et stopp&eacute; avec "shorewall stop". Lorsque le firewall est stopp&eacute;,
le routage est permis sur les h&ocirc;tes qui sont dans le fichier<a le routage est permis sur les h&ocirc;tes qui sont dans le fichier<a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. Un
firewall fonctionnant peut &ecirc;tre relanc&eacute; en utilisant la commande firewall fonctionnant peut &ecirc;tre relanc&eacute; en utilisant la commande
"shorewall restart". Si vous voulez enlever toutes les traces de Shorewall "shorewall restart". Si vous voulez enlever toutes les traces de Shorewall
dans votre configuration de Netfilter, utilisez "shorewall clear".</p> dans votre configuration de Netfilter, utilisez "shorewall clear".</p>
<p align="left"><img src="images/BD21298_.gif" name="Image20" <p align="left"><img src="images/BD21298_.gif" name="Image20"
align="bottom" width="13" height="13" border="0"> align="bottom" width="13" height="13" border="0">
&nbsp;&nbsp;&nbsp; Les exemples (two-interface) supposent que vous voulez &nbsp;&nbsp;&nbsp; Les exemples (two-interface) supposent que vous voulez
permettre le routage depuis ou vers <b>eth1 </b>(le r&eacute;seau local) lorsque permettre le routage depuis ou vers <b>eth1 </b>(le r&eacute;seau local)
Shorewall est stopp&eacute;. Si votre r&eacute;seau local n' est pas connect&eacute; lorsque Shorewall est stopp&eacute;. Si votre r&eacute;seau local n' est
&agrave; <b>eth1</b> ou si vous voulez permettre l'acc&egrave;s depuis ou pas connect&eacute; &agrave; <b>eth1</b> ou si vous voulez permettre l'acc&egrave;s
vers d'autres h&ocirc;tes, changez /etc/shorewall/routestopped en cons&eacute;quence.</p> depuis ou vers d'autres h&ocirc;tes, changez /etc/shorewall/routestopped
en cons&eacute;quence.</p>
<p align="left"><b>ATTENTION: </b>Si vous &ecirc;tes connect&eacute; &agrave; <p align="left"><b>ATTENTION: </b>Si vous &ecirc;tes connect&eacute; &agrave;
votre firewall depuis Internet, n'essayez pas la commande "shorewall stop" votre firewall depuis Internet, n'essayez pas la commande "shorewall stop"
tant que vous n'avez pas ajout&eacute; une entr&eacute;e pour votre adresse tant que vous n'avez pas ajout&eacute; une entr&eacute;e pour votre adresse
IP depuis laquelle vous &ecirc;tes connect&eacute; dans<a IP depuis laquelle vous &ecirc;tes connect&eacute; dans<a
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. De href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. De
plus, je ne vous recommande pas d'utiliser "shorewall restart"; il est mieux plus, je ne vous recommande pas d'utiliser "shorewall restart"; il est mieux
de cr&eacute;er une <a href="configuration_file_basics.htm#Configs"><i>configuration de cr&eacute;er une <a href="configuration_file_basics.htm#Configs"><i>configuration
alternative</i></a> et de l'essayer en utilisant la commande<a alternative</i></a> et de l'essayer en utilisant la commande<a
href="starting_and_stopping_shorewall.htm">"shorewall try".</a></p> href="starting_and_stopping_shorewall.htm">"shorewall try".</a></p>
@ -1364,7 +1366,8 @@ de cr&eacute;er une <a href="configuration_file_basics.htm#Configs"><i>configura
href="support.htm">Tom Eastep</a></font></p> href="support.htm">Tom Eastep</a></font></p>
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002 Thomas <p align="left"><a href="copyright.htm"><font size="2">Copyright 2002 Thomas
M. Eastep</font></a></p> M. Eastep</font></a></p>
<br>
<br> <br>
<br> <br>
<br> <br>

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@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber1" style="border-collapse: collapse;" width="100%" id="AutoNumber1"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -56,6 +56,7 @@
<h3> </h3> <h3> </h3>
<h3>Version &gt;= 1.4.6</h3> <h3>Version &gt;= 1.4.6</h3>
<ul> <ul>
<li> The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have been removed <li> The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT options have been removed
from shorewall.conf. These capabilities are now automatically detected by from shorewall.conf. These capabilities are now automatically detected by
@ -65,25 +66,26 @@ file as follows:<br>
<br> <br>
<i>zone</i>    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br> <i>zone</i>    eth1:192.168.1.0/24,eth2:192.168.2.0/24<br>
<br> <br>
This capability was never documented and has been removed in 1.4.6 to allow This capability was never documented and has been removed in 1.4.6 to allow
entries of the following format:<br> entries of the following format:<br>
<br> <br>
<i>zone</i>   eth1:192.168.1.0/24,192.168.2.0/24<br> <i>zone</i>   eth1:192.168.1.0/24,192.168.2.0/24<br>
</li> </li>
</ul> </ul>
<h3>Version &gt;= 1.4.4</h3> <h3>Version &gt;= 1.4.4</h3>
If you are upgrading from 1.4.3 and have set the LOGMARKER variable in If you are upgrading from 1.4.3 and have set the LOGMARKER variable
<a href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</a>, then in <a href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</a>, then
you must set the new LOGFORMAT variable appropriately and remove your setting you must set the new LOGFORMAT variable appropriately and remove your setting
of LOGMARKER<br> of LOGMARKER<br>
<br> <br>
<h3>Version 1.4.4<br> <h3>Version 1.4.4<br>
</h3> </h3>
If you have zone names that are 5 characters long, you may experience problems If you have zone names that are 5 characters long, you may experience
starting Shorewall because the --log-prefix in a logging rule is too long. problems starting Shorewall because the --log-prefix in a logging rule
Upgrade to Version 1.4.4a to fix this problem..<br> is too long. Upgrade to Version 1.4.4a to fix this problem..<br>
<h3>Version &gt;= 1.4.2</h3> <h3>Version &gt;= 1.4.2</h3>
There are some cases where you may want to handle traffic from a particular There are some cases where you may want to handle traffic from a particular
@ -102,29 +104,30 @@ transparent proxy in your local zone.</a></li>
<h3>Version &gt;= 1.4.1</h3> <h3>Version &gt;= 1.4.1</h3>
<ul> <ul>
<li>Beginning with Version 1.4.1, traffic between groups in the <li>Beginning with Version 1.4.1, traffic between groups in
same zone is accepted by default. Previously, traffic from a zone to itself the same zone is accepted by default. Previously, traffic from a zone
was treated just like any other traffic; any matching rules were applied to itself was treated just like any other traffic; any matching rules
followed by enforcement of the appropriate policy. With 1.4.1 and later were applied followed by enforcement of the appropriate policy. With 1.4.1
versions, unless you have explicit rules for traffic from Z to Z or you and later versions, unless you have explicit rules for traffic from Z
have an explicit Z to Z policy (where "Z" is some zone) then traffic between to Z or you have an explicit Z to Z policy (where "Z" is some zone) then
the groups in zone Z will be accepted. If you do have one or more explicit traffic between the groups in zone Z will be accepted. If you do have one
rules for Z to Z or if you have an explicit Z to Z policy then the behavior or more explicit rules for Z to Z or if you have an explicit Z to Z policy
is as it was in prior versions.</li> then the behavior is as it was in prior versions.</li>
</ul> </ul>
<blockquote> <blockquote>
<ol> <ol>
<li>If you have a Z Z ACCEPT policy for a zone to allow traffic <li>If you have a Z Z ACCEPT policy for a zone to allow traffic
between two interfaces to the same zone, that policy can be removed and between two interfaces to the same zone, that policy can be removed
traffic between the interfaces will traverse fewer rules than previously.</li> and traffic between the interfaces will traverse fewer rules than previously.</li>
<li>If you have a Z Z DROP or Z Z REJECT policy or you have <li>If you have a Z Z DROP or Z Z REJECT policy or you have
Z-&gt;Z rules then your configuration should not require any change.</li> Z-&gt;Z rules then your configuration should not require any change.</li>
<li>If you are currently relying on a implicit policy (one that <li>If you are currently relying on a implicit policy (one
has "all" in either the SOURCE or DESTINATION column) to prevent traffic that has "all" in either the SOURCE or DESTINATION column) to prevent
between two interfaces to a zone Z and you have no rules for Z-&gt;Z traffic between two interfaces to a zone Z and you have no rules for
then you should add an explicit DROP or REJECT policy for Z to Z.<br> Z-&gt;Z then you should add an explicit DROP or REJECT policy for Z to
Z.<br>
</li> </li>
</ol> </ol>
@ -143,15 +146,15 @@ then you should add an explicit DROP or REJECT policy for Z to Z.<br>
<pre>/etc/shorewall/zones<br><br>z1 Zone1 The first Zone<br>z2 Zone2 The secont Zone<br><br>/etc/shorewall/interfaces<br><br>z2 eth1 192.168.1.255<br><br>/etc/shorewall/hosts<br><br>z1 eth1:192.168.1.3<br></pre> <pre>/etc/shorewall/zones<br><br>z1 Zone1 The first Zone<br>z2 Zone2 The secont Zone<br><br>/etc/shorewall/interfaces<br><br>z2 eth1 192.168.1.255<br><br>/etc/shorewall/hosts<br><br>z1 eth1:192.168.1.3<br></pre>
</blockquote> </blockquote>
Here, zone z1 is nested in zone z2 and the firewall is not going Here, zone z1 is nested in zone z2 and the firewall is not going
to be involved in any traffic between these two zones. Beginning with Shorewall to be involved in any traffic between these two zones. Beginning with
1.4.1, you can prevent Shorewall from setting up any infrastructure to Shorewall 1.4.1, you can prevent Shorewall from setting up any infrastructure
handle traffic between z1 and z2 by using the new NONE policy:<br> to handle traffic between z1 and z2 by using the new NONE policy:<br>
<blockquote> <blockquote>
<pre>/etc/shorewall/policy<br><pre>z1 z2 NONE<br>z2 z1 NONE</pre></pre> <pre>/etc/shorewall/policy<br><pre>z1 z2 NONE<br>z2 z1 NONE</pre></pre>
</blockquote> </blockquote>
Note that NONE policies are generally used in pairs unless there Note that NONE policies are generally used in pairs unless there
is asymetric routing where only the traffic on one direction flows through is asymetric routing where only the traffic on one direction flows through
the firewall and you are using a NONE polciy in the other direction. </blockquote> the firewall and you are using a NONE polciy in the other direction. </blockquote>
<h3>Version 1.4.1<br> <h3>Version 1.4.1<br>
@ -159,7 +162,7 @@ is asymetric routing where only the traffic on one direction flows through
<ul> <ul>
<li>In Version 1.4.1, Shorewall will never create rules to <li>In Version 1.4.1, Shorewall will never create rules to
deal with traffic from a given group back to itself. The <i>multi</i> deal with traffic from a given group back to itself. The <i>multi</i>
interface option is no longer available so if you want to route traffic interface option is no longer available so if you want to route traffic
between two subnetworks on the same interface then I recommend that you between two subnetworks on the same interface then I recommend that you
upgrade to Version 1.4.2 and use the 'routeback' interface or host option. </li> upgrade to Version 1.4.2 and use the 'routeback' interface or host option. </li>
@ -171,31 +174,32 @@ upgrade to Version 1.4.2 and use the 'routeback' interface or host option.
iproute package ('ip' utility).</b><br> iproute package ('ip' utility).</b><br>
<br> <br>
<b>Note: </b>Unfortunately, some distributions call this package <b>Note: </b>Unfortunately, some distributions call this package
iproute2 which will cause the upgrade of Shorewall to fail with the diagnostic:<br> iproute2 which will cause the upgrade of Shorewall to fail with the
diagnostic:<br>
<br> <br>
     error: failed dependencies:iproute is needed by shorewall-1.4.0-1      error: failed dependencies:iproute is needed by shorewall-1.4.0-1
<br> <br>
<br> <br>
This may be worked around by using the --nodeps option of rpm This may be worked around by using the --nodeps option of rpm
(rpm -Uvh --nodeps &lt;shorewall rpm&gt;).<br> (rpm -Uvh --nodeps &lt;shorewall rpm&gt;).<br>
<br> <br>
If you are upgrading from a version &lt; 1.4.0, then:<br> If you are upgrading from a version &lt; 1.4.0, then:<br>
<ul> <ul>
<li>The <b>noping </b>and <b>forwardping</b> interface <li>The <b>noping </b>and <b>forwardping</b> interface
options are no longer supported nor is the <b>FORWARDPING </b>option options are no longer supported nor is the <b>FORWARDPING </b>option
in shorewall.conf. ICMP echo-request (ping) packets are treated just in shorewall.conf. ICMP echo-request (ping) packets are treated just
like any other connection request and are subject to rules and policies.</li> like any other connection request and are subject to rules and policies.</li>
<li>Interface names of the form &lt;device&gt;:&lt;integer&gt; <li>Interface names of the form &lt;device&gt;:&lt;integer&gt;
in /etc/shorewall/interfaces now generate a Shorewall error at startup in /etc/shorewall/interfaces now generate a Shorewall error at startup
(they always have produced warnings in iptables).</li> (they always have produced warnings in iptables).</li>
<li>The MERGE_HOSTS variable has been removed from shorewall.conf. <li>The MERGE_HOSTS variable has been removed from shorewall.conf.
Shorewall 1.4 behaves like 1.3 did when MERGE_HOSTS=Yes; that is zone Shorewall 1.4 behaves like 1.3 did when MERGE_HOSTS=Yes; that is zone
contents are determined by BOTH the interfaces and hosts files when contents are determined by BOTH the interfaces and hosts files when
there are entries for the zone in both files.</li> there are entries for the zone in both files.</li>
<li>The <b>routestopped</b> option in the interfaces and <li>The <b>routestopped</b> option in the interfaces
hosts file has been eliminated; use entries in the routestopped file and hosts file has been eliminated; use entries in the routestopped
instead.</li> file instead.</li>
<li>The Shorewall 1.2 syntax for DNAT and REDIRECT rules <li>The Shorewall 1.2 syntax for DNAT and REDIRECT rules
is no longer accepted; you must convert to using the new syntax.</li> is no longer accepted; you must convert to using the new syntax.</li>
<li value="6">The ALLOWRELATED variable in shorewall.conf <li value="6">The ALLOWRELATED variable in shorewall.conf
@ -255,22 +259,23 @@ the SOURCE and DESTINATION columns.</li>
height="13"> height="13">
     Beginning in version 1.3.14, Shorewall treats entries      Beginning in version 1.3.14, Shorewall treats entries
in <a href="Documentation.htm#Masq">/etc/shorewall/masq </a>differently. in <a href="Documentation.htm#Masq">/etc/shorewall/masq </a>differently.
The change involves entries with an <b>interface name</b> in the The change involves entries with an <b>interface name</b> in the <b>SUBNET</b>
<b>SUBNET</b> (second) <b>column</b>:<br> (second) <b>column</b>:<br>
<ul> <ul>
<li>Prior to 1.3.14, Shorewall would detect the FIRST <li>Prior to 1.3.14, Shorewall would detect the FIRST
subnet on the interface (as shown by "ip addr show <i>interface</i>") subnet on the interface (as shown by "ip addr show <i>interface</i>")
and would masquerade traffic from that subnet. Any other subnets that and would masquerade traffic from that subnet. Any other subnets that
routed through eth1 needed their own entry in /etc/shorewall/masq routed through eth1 needed their own entry in /etc/shorewall/masq to
to be masqueraded or to have SNAT applied.</li> be masqueraded or to have SNAT applied.</li>
<li>Beginning with Shorewall 1.3.14, Shorewall uses <li>Beginning with Shorewall 1.3.14, Shorewall uses
the firewall's routing table to determine ALL subnets routed through the firewall's routing table to determine ALL subnets routed through
the named interface. Traffic originating in ANY of those subnets the named interface. Traffic originating in ANY of those subnets is
is masqueraded or has SNAT applied.</li> masqueraded or has SNAT applied.</li>
</ul> </ul>
You will need to make a change to your configuration if:<br> You will need to make a change to your configuration
if:<br>
<ol> <ol>
<li>You have one or more entries in /etc/shorewall/masq <li>You have one or more entries in /etc/shorewall/masq
@ -311,8 +316,9 @@ the old handling indefinitely so I urge current users to migrate to using
handling documentation</a> for details.<br> handling documentation</a> for details.<br>
<h3>Version 1.3.10</h3> <h3>Version 1.3.10</h3>
If you have installed the 1.3.10 Beta 1 RPM and are now If you have installed the 1.3.10 Beta 1 RPM and are
upgrading to version 1.3.10, you will need to use the '--force' option:<br> now upgrading to version 1.3.10, you will need to use the '--force'
option:<br>
<br> <br>
<blockquote> <blockquote>
@ -321,9 +327,8 @@ the old handling indefinitely so I urge current users to migrate to using
<h3>Version &gt;= 1.3.9</h3> <h3>Version &gt;= 1.3.9</h3>
The 'functions' file has moved to /usr/lib/shorewall/functions. The 'functions' file has moved to /usr/lib/shorewall/functions.
If you have an application that uses functions from that file, If you have an application that uses functions from that file, your
your application will need to be changed to reflect this change of application will need to be changed to reflect this change of location.<br>
location.<br>
<h3>Version &gt;= 1.3.8</h3> <h3>Version &gt;= 1.3.8</h3>
@ -353,14 +358,14 @@ location.<br>
<ol> <ol>
<li>Be sure you <li>Be sure you
have a backup -- you will need have a backup -- you will need
to transcribe any Shorewall configuration to transcribe any Shorewall configuration
changes that you have made to the new changes that you have made to the new
configuration.</li> configuration.</li>
<li>Replace the <li>Replace the
shorwall.lrp package provided on shorwall.lrp package provided on
the Bering floppy with the later one. If you did the Bering floppy with the later one. If you did
not obtain the later version from Jacques's not obtain the later version from Jacques's site,
site, see additional instructions below.</li> see additional instructions below.</li>
<li>Edit the /var/lib/lrpkg/root.exclude.list <li>Edit the /var/lib/lrpkg/root.exclude.list
file and remove the /var/lib/shorewall file and remove the /var/lib/shorewall
entry if present. Then do not entry if present. Then do not
@ -382,8 +387,8 @@ forget to backup root.lrp !</li>
<p align="left">If you have a pair of firewall systems configured for <p align="left">If you have a pair of firewall systems configured for
failover or if you have asymmetric routing, you will need to modify failover or if you have asymmetric routing, you will need to modify
your firewall setup slightly under Shorewall versions 1.3.6 your firewall setup slightly under Shorewall versions
and 1.3.7</p> 1.3.6 and 1.3.7</p>
<ol> <ol>
<li> <li>
@ -391,20 +396,21 @@ forget to backup root.lrp !</li>
<p align="left">Create the file /etc/shorewall/newnotsyn and in it add <p align="left">Create the file /etc/shorewall/newnotsyn and in it add
the following rule<br> the following rule<br>
<br> <br>
<font face="Courier">run_iptables -A newnotsyn <font face="Courier">run_iptables -A
-j RETURN # So that the connection tracking table can newnotsyn -j RETURN # So that the connection tracking
be rebuilt<br> table can be rebuilt<br>
                                    #                                    
from non-SYN packets after takeover.<br> # from non-SYN packets after takeover.<br>
 </font> </p>  </font> </p>
</li> </li>
<li> <li>
<p align="left">Create /etc/shorewall/common (if you don't already <p align="left">Create /etc/shorewall/common (if you don't already
have that file) and include the following:<br> have that file) and include the following:<br>
<br> <br>
<font face="Courier">run_iptables -A common <font face="Courier">run_iptables -A
-p tcp --tcp-flags ACK,FIN,RST ACK -j ACCEPT #Accept common -p tcp --tcp-flags ACK,FIN,RST ACK -j ACCEPT
Acks to rebuild connection<br> #Accept Acks to rebuild connection<br>
                                                                                                                                       
#tracking table. <br> #tracking table. <br>
. /etc/shorewall/common.def</font> </p> . /etc/shorewall/common.def</font> </p>
@ -450,15 +456,16 @@ from non-SYN packets after takeover.<br>
<p align="left">The functions and versions files together with the 'firewall' <p align="left">The functions and versions files together with the 'firewall'
symbolic link have moved from /etc/shorewall to /var/lib/shorewall. symbolic link have moved from /etc/shorewall to /var/lib/shorewall.
If you have applications that access these files, those If you have applications that access these files, those
applications should be modified accordingly.</p> applications should be modified accordingly.</p>
<p><font size="2"> Last updated 6/29/2003 - <a href="support.htm">Tom Eastep</a></font> <p><font size="2"> Last updated 6/29/2003 - <a href="support.htm">Tom
</p> Eastep</a></font> </p>
<p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font> <p><font face="Trebuchet MS"><a href="copyright.htm"><font size="2">Copyright</font>
© <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br> © <font size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a></font><br>
</p> </p>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

3
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@ -12,7 +12,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4" style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90"> bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -61,5 +61,6 @@
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

59
Shorewall-docs/whitelisting_under_shorewall.htm
View File

@ -16,7 +16,7 @@
<table border="0" cellpadding="0" cellspacing="0" <table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" bordercolor="#111111" width="100%" style="border-collapse: collapse;" bordercolor="#111111" width="100%"
id="AutoNumber1" bgcolor="#400169" height="90"> id="AutoNumber1" bgcolor="#3366ff" height="90">
<tbody> <tbody>
<tr> <tr>
<td width="100%"> <td width="100%">
@ -27,9 +27,9 @@
</tbody> </tbody>
</table> </table>
<p align="left">For a brief time, the 1.2 version of Shorewall supported an <p align="left">For a brief time, the 1.2 version of Shorewall supported
/etc/shorewall/whitelist file. This file was intended to contain a list of an /etc/shorewall/whitelist file. This file was intended to contain a list
IP addresses of hosts whose POLICY to all zones was ACCEPT. The whitelist of IP addresses of hosts whose POLICY to all zones was ACCEPT. The whitelist
file was implemented as a stop-gap measure until the facilities necessary file was implemented as a stop-gap measure until the facilities necessary
for implementing white lists using zones was in place. As of Version 1.3 for implementing white lists using zones was in place. As of Version 1.3
RC1, those facilities were available.</p> RC1, those facilities were available.</p>
@ -39,18 +39,19 @@ to a set
following environment:</p> following environment:</p>
<ul> <ul>
<li>A firewall with three interfaces -- one to the internet, one to <li>A firewall with three interfaces -- one to the internet, one
a local network and one to a DMZ.</li> to a local network and one to a DMZ.</li>
<li>The local network uses SNAT to the internet and is comprised of <li>The local network uses SNAT to the internet and is comprised
the class B network 10.10.0.0/16 (Note: While this example uses an RFC 1918 of the class B network 10.10.0.0/16 (Note: While this example uses an RFC
local network, the technique described here in no way depends on that or 1918 local network, the technique described here in no way depends on
on SNAT. It may be used with Proxy ARP, Subnet Routing, Static NAT, etc.).</li> that or on SNAT. It may be used with Proxy ARP, Subnet Routing, Static
NAT, etc.).</li>
<li>The network operations staff have workstations with IP addresses <li>The network operations staff have workstations with IP addresses
in the class C network 10.10.10.0/24</li> in the class C network 10.10.10.0/24</li>
<li>We want the network operations staff to have full access to all <li>We want the network operations staff to have full access to all
other hosts.</li> other hosts.</li>
<li>We want the network operations staff to bypass the transparent <li>We want the network operations staff to bypass the transparent
HTTP proxy running on our firewall.</li> HTTP proxy running on our firewall.</li>
</ul> </ul>
@ -127,7 +128,6 @@ since <b>ops</b> is a sub-zone of <b>loc</b>, we list it <u>BEFORE</u> <b>loc</b
<td> </td> <td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
@ -139,7 +139,6 @@ we don't specify a zone for it here.</p>
<blockquote> <font face="Century Gothic, Arial, Helvetica"> <blockquote> <font face="Century Gothic, Arial, Helvetica">
</font> </font>
<table border="2"> <table border="2">
<tbody> <tbody>
<tr> <tr>
@ -159,23 +158,21 @@ we don't specify a zone for it here.</p>
<td> </td> <td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
<p>Here we define the <b>ops</b> and <b>loc</b> zones. When Shorewall is <p>Here we define the <b>ops</b> and <b>loc</b> zones. When Shorewall is stopped,
stopped, only the hosts in the <b>ops</b> zone will be allowed to access the only the hosts in the <b>ops</b> zone will be allowed to access the firewall
firewall and the DMZ. I use 0.0.0.0/0 to define the <b>loc</b> zone rather and the DMZ. I use 0.0.0.0/0 to define the <b>loc</b> zone rather than 10.10.0.0/16
than 10.10.0.0/16 so that the limited broadcast address (255.255.255.255) so that the limited broadcast address (255.255.255.255) falls into that
falls into that zone. If I used 10.10.0.0/16 then I would have to have a zone. If I used 10.10.0.0/16 then I would have to have a separate entry for
separate entry for that special address.</p> that special address.</p>
<h2>Policy File</h2> <h2>Policy File</h2>
<blockquote> <font face="Century Gothic, Arial, Helvetica"> <blockquote> <font face="Century Gothic, Arial, Helvetica">
</font> </font>
<table border="2"> <table border="2">
<tbody> <tbody>
<tr> <tr>
@ -189,18 +186,14 @@ separate entry for that special address.</p>
<td><font color="#0000ff">ops</font></td> <td><font color="#0000ff">ops</font></td>
<td><font color="#0000ff">all</font></td> <td><font color="#0000ff">all</font></td>
<td><font color="#0000ff">ACCEPT</font></td> <td><font color="#0000ff">ACCEPT</font></td>
<td> </td> <td> </td>
<td> </td> <td> </td>
</tr> </tr>
<tr> <tr>
<td><font color="#0000ff">all</font></td> <td><font color="#0000ff">all</font></td>
<td><font color="#0000ff">ops</font></td> <td><font color="#0000ff">ops</font></td>
<td><font color="#0000ff">CONTINUE</font></td> <td><font color="#0000ff">CONTINUE</font></td>
<td> </td> <td> </td>
<td> </td> <td> </td>
</tr> </tr>
<tr> <tr>
@ -208,7 +201,6 @@ separate entry for that special address.</p>
<td>net</td> <td>net</td>
<td>ACCEPT</td> <td>ACCEPT</td>
<td> </td> <td> </td>
<td> </td> <td> </td>
</tr> </tr>
<tr> <tr>
@ -226,7 +218,6 @@ separate entry for that special address.</p>
<td> </td> <td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
@ -271,8 +262,6 @@ file.<font color="#ff0000"><b></b></font></p>
<td> </td> <td> </td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
</blockquote> </blockquote>
@ -280,6 +269,7 @@ file.<font color="#ff0000"><b></b></font></p>
<p>This is the rule that transparently redirects web traffic to the transparent <p>This is the rule that transparently redirects web traffic to the transparent
proxy running on the firewall. The SOURCE column explicitly excludes the proxy running on the firewall. The SOURCE column explicitly excludes the
<b>ops</b> zone from the rule.</p> <b>ops</b> zone from the rule.</p>
<h2>Routestopped File</h2> <h2>Routestopped File</h2>
<blockquote> <blockquote>
@ -302,24 +292,17 @@ file.<font color="#ff0000"><b></b></font></p>
<td>10.10.10.0/24</td> <td>10.10.10.0/24</td>
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<p><font size="2"> Updated 2/18/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2"> Updated 2/18/2003 - <a href="support.htm">Tom Eastep</a>
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© <font size="2">2002, 2003Thomas M. Eastep.</font></a></font></p> © <font size="2">2002, 2003Thomas M. Eastep.</font></a></font></p>
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