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Shorewall 1.4.6 RC1

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Shorewall-docs/FAQ.htm
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@ -12,6 +12,7 @@
<meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="ProgId" content="FrontPage.Editor.Document">
<title>Shorewall FAQ</title> <title>Shorewall FAQ</title>
<meta name="Microsoft Theme" content="none"> <meta name="Microsoft Theme" content="none">
</head> </head>
<body> <body>
@ -39,9 +40,9 @@
</h1> </h1>
<p align="left"><b>1. </b><a href="#faq1"> I want to <b>forward</b> UDP <b> <p align="left"><b>1. </b><a href="#faq1"> I want to <b>forward</b> UDP <b>
port</b> 7777 to my my personal PC with IP address port</b> 7777 to my my personal PC with IP
192.168.1.5. I've looked everywhere and can't address 192.168.1.5. I've looked everywhere and
find <b>how to do it</b>.</a></p> can't find <b>how to do it</b>.</a></p>
<p align="left"><b>1a. </b><a href="#faq1a">Ok -- I followed those instructions <p align="left"><b>1a. </b><a href="#faq1a">Ok -- I followed those instructions
but it doesn't work.<br> but it doesn't work.<br>
@ -86,8 +87,8 @@ using their DNS names.</b></a></p>
as 'closed' rather than 'blocked'.</b> Why?</a></p> as 'closed' rather than 'blocked'.</b> Why?</a></p>
<p align="left"><b>4a. </b><a href="#faq4a">I just ran an <b>nmap UDP scan</b> <p align="left"><b>4a. </b><a href="#faq4a">I just ran an <b>nmap UDP scan</b>
of my firewall and it showed 100s of ports as of my firewall and it showed 100s of ports
open!!!!<br> as open!!!!<br>
</a></p> </a></p>
<b>4b</b>. <a href="#faq4b">I have a port that I can't close no matter <b>4b</b>. <a href="#faq4b">I have a port that I can't close no matter
how I change my rules. </a> how I change my rules. </a>
@ -110,13 +111,13 @@ using their DNS names.</b></a></p>
<p align="left"><b>6b. <a href="#faq6b">DROP messages</a></b><a <p align="left"><b>6b. <a href="#faq6b">DROP messages</a></b><a
href="#faq6b"> on port 10619 are <b>flooding the logs</b> with their connect href="#faq6b"> on port 10619 are <b>flooding the logs</b> with their connect
requests. Can i exclude these error messages for this port temporarily requests. Can i exclude these error messages for this port
from logging in Shorewall?</a><br> temporarily from logging in Shorewall?</a><br>
</p> </p>
<p align="left"><b>6c. </b><a href="#faq6c">All day long I get a steady flow <p align="left"><b>6c. </b><a href="#faq6c">All day long I get a steady flow
of these <b>DROP messages from port 53</b> <b>to some high numbered of these <b>DROP messages from port 53</b> <b>to some high
port</b>. They get dropped, but what the heck are they?</a><br> numbered port</b>. They get dropped, but what the heck are they?</a><br>
</p> </p>
<p align="left"><b>6d.</b> <a href="#faq6d">Why is the <b>MAC address</b> <p align="left"><b>6d.</b> <a href="#faq6d">Why is the <b>MAC address</b>
@ -131,8 +132,8 @@ using their DNS names.</b></a></p>
<a href="#faq17">How do I find out <b>why this traffic is</b> <a href="#faq17">How do I find out <b>why this traffic is</b>
getting <b>logged?</b></a><br> getting <b>logged?</b></a><br>
<b><br> <b><br>
21. </b><a href="#faq21">I see these <b>strange log entries 21. </b><a href="#faq21">I see these <b>strange log
</b>occasionally; what are they?</a><br> entries </b>occasionally; what are they?</a><br>
<h1>STARTING AND STOPPING<br> <h1>STARTING AND STOPPING<br>
</h1> </h1>
@ -152,9 +153,10 @@ stop', I can't connect to anything</b>. Why doesn't that command
<p align="left"><b>9. </b><a href="FAQ.htm#faq9">Why can't Shorewall <b>detect <p align="left"><b>9. </b><a href="FAQ.htm#faq9">Why can't Shorewall <b>detect
my interfaces </b>properly at startup?</a></p> my interfaces </b>properly at startup?</a></p>
<b>22. </b><a href="#faq22">I <b>22. </b><a
have some <b>iptables commands </b>that I want to <b>run href="#faq22">I have some <b>iptables commands </b>that I
when Shorewall starts.</b> Which file do I put them in?</a><br> want to <b>run when Shorewall starts.</b> Which file do I put them
in?</a><br>
<h1>ABOUT SHOREWALL<br> <h1>ABOUT SHOREWALL<br>
</h1> </h1>
@ -167,25 +169,26 @@ when Shorewall starts.</b> Which file do I put them in?</a><br>
<p align="left"><b>12. </b><a href="#faq12">Is there a <b>GUI?</b></a></p> <p align="left"><b>12. </b><a href="#faq12">Is there a <b>GUI?</b></a></p>
<p align="left"><b>13. </b><a href="#faq13">Why do you call it <b>"Shorewall"?</b></a></p> <p align="left"><b>13. </b><a href="#faq13">Why do you call it <b>"Shorewall"?</b></a></p>
<b>23. </b><a href="#faq23">Why do you <b>23. </b><a href="#faq23">Why do
use such <b>ugly fonts</b> on your <b>web site</b>?</a><br> you use such <b>ugly fonts</b> on your <b>web site</b>?</a><br>
<b><br> <b><br>
25. </b><a href="#faq25">How to I tell <b>which version of Shorewall</b> 25. </b><a href="#faq25">How to I tell <b>which version of
I am <b>running</b>?</a><br> Shorewall</b> I am <b>running</b>?</a><br>
<h1>RFC 1918<br> <h1>RFC 1918<br>
</h1> </h1>
<p align="left"><b>14. </b><a href="#faq14">I'm connected via a cable modem <p align="left"><b>14. </b><a href="#faq14">I'm connected via a cable modem
and it has an internel web server that allows and it has an internel web server that allows
me to configure/monitor it but as expected if I enable me to configure/monitor it but as expected if I
<b> rfc1918 blocking</b> for my eth0 interface, it also enable <b> rfc1918 blocking</b> for my eth0 interface,
blocks the <b>cable modems web server</b></a>.</p> it also blocks the <b>cable modems web server</b></a>.</p>
<p align="left"><b>14a. </b><a href="#faq14a">Even though it assigns public <p align="left"><b>14a. </b><a href="#faq14a">Even though it assigns public
IP addresses, my ISP's DHCP server has an RFC IP addresses, my ISP's DHCP server has an RFC
1918 address. If I enable RFC 1918 filtering on my 1918 address. If I enable RFC 1918 filtering on
external interface, <b>my DHCP client cannot renew its lease</b>.</a></p> my external interface, <b>my DHCP client cannot renew its
lease</b>.</a></p>
<h1>ALIAS IP ADDRESSES/VIRTUAL INTERFACES<br> <h1>ALIAS IP ADDRESSES/VIRTUAL INTERFACES<br>
</h1> </h1>
@ -195,9 +198,9 @@ when Shorewall starts.</b> Which file do I put them in?</a><br>
<h1>MISCELLANEOUS<br> <h1>MISCELLANEOUS<br>
</h1> </h1>
<b>19. </b><a href="#faq19">I have added <b>entries to <b>19. </b><a href="#faq19">I have added <b>entries
/etc/shorewall/tcrules</b> but they <b>don't </b>seem to <b>do to /etc/shorewall/tcrules</b> but they <b>don't </b>seem to
anything</b>. Why?</a><br> <b>do anything</b>. Why?</a><br>
<br> <br>
<b>20. </b><a <b>20. </b><a
href="#faq20">I have just set up a server. <b>Do I have href="#faq20">I have just set up a server. <b>Do I have
@ -207,14 +210,20 @@ to change Shorewall to allow access to my server from the internet?<
conections</b> to let's say the ssh port only<b> from specific conections</b> to let's say the ssh port only<b> from specific
IP Addresses</b> on the internet?</a><br> IP Addresses</b> on the internet?</a><br>
<br> <br>
<b>26. </b><a href="#faq26">When I try to use any of the <b>26. </b><a href="#faq26">When I try to use any of
<b>SYN options in nmap</b> on or behind the firewall, I get "<b>operation the <b>SYN options in nmap</b> on or behind the firewall, I get "<b>operation
not permitted</b>". How can I use nmap with Shorewall?"</a><br> not permitted</b>". How can I use nmap with Shorewall?"</a><br>
<br>
<b>27. </b><a href="#faq27">I am compiling a <b>new kernel</b> for my firewall<b>.</b>
What should I look out for?</a><br>
<br>
<b>28. </b><a href="#faq28">How do I use Shorewall as a <b>Bridging Firewall</b>?</a><br>
<hr> <hr>
<h4 align="left"><a name="faq1"></a>1. I want to forward UDP port 7777 to <h4 align="left"><a name="faq1"></a>1. I want to forward UDP port 7777 to
my my personal PC with IP address 192.168.1.5. my my personal PC with IP address 192.168.1.5.
I've looked everywhere and can't find how to do it.</h4> I've looked everywhere and can't find how to do
it.</h4>
<p align="left"><b>Answer: </b>The <a <p align="left"><b>Answer: </b>The <a
href="Documentation.htm#PortForward"> first example</a> in the <a href="Documentation.htm#PortForward"> first example</a> in the <a
@ -245,9 +254,11 @@ not permitted</b>". How can I use nmap with Shorewall?"</a><br>
<td><i>&lt;protocol&gt;</i></td> <td><i>&lt;protocol&gt;</i></td>
<td><i>&lt;port <td><i>&lt;port
#&gt;</i></td> #&gt;</i></td>
<td> <br> <td>
<br>
</td> </td>
<td> <br> <td>
<br>
</td> </td>
</tr> </tr>
@ -279,9 +290,11 @@ not permitted</b>". How can I use nmap with Shorewall?"</a><br>
<td>loc:192.168.1.5</td> <td>loc:192.168.1.5</td>
<td>udp</td> <td>udp</td>
<td>7777</td> <td>7777</td>
<td> <br> <td>
<br>
</td> </td>
<td> <br> <td>
<br>
</td> </td>
</tr> </tr>
@ -290,9 +303,9 @@ not permitted</b>". How can I use nmap with Shorewall?"</a><br>
</blockquote> </blockquote>
<div align="left"> <font face="Courier"> </font>If <div align="left"> <font face="Courier"> </font>If
you want to forward requests directed to a particular address you want to forward requests directed to a particular
( <i>&lt;external IP&gt;</i> ) on your firewall to an internal address ( <i>&lt;external IP&gt;</i> ) on your firewall to
system:</div> an internal system:</div>
<blockquote> <blockquote>
<table border="1" cellpadding="2" cellspacing="0" <table border="1" cellpadding="2" cellspacing="0"
@ -335,13 +348,14 @@ not permitted</b>". How can I use nmap with Shorewall?"</a><br>
things:</p> things:</p>
<ul> <ul>
<li>You are <li>You
trying to test from inside your firewall (no, that are trying to test from inside your firewall (no, that
won't work -- see <a href="#faq2">FAQ #2</a>).</li> won't work -- see <a href="#faq2">FAQ #2</a>).</li>
<li>You have <li>You
a more basic problem with your local system such as have a more basic problem with your local system such
an incorrect default gateway configured (it should be as an incorrect default gateway configured (it should
set to the IP address of your firewall's internal interface).</li> be set to the IP address of your firewall's internal
interface).</li>
<li>Your ISP is blocking that particular port inbound.<br> <li>Your ISP is blocking that particular port inbound.<br>
</li> </li>
@ -353,25 +367,25 @@ set to the IP address of your firewall's internal interface).</l
diagnose this problem:<br> diagnose this problem:<br>
<ul> <ul>
<li>As root, type "iptables <li>As root, type
-t nat -Z". This clears the NetFilter counters in "iptables -t nat -Z". This clears the NetFilter counters
the nat table.</li> in the nat table.</li>
<li>Try to connect to <li>Try to connect
the redirected port from an external host.</li> to the redirected port from an external host.</li>
<li>As root type "shorewall <li>As root type "shorewall
show nat"</li> show nat"</li>
<li>Locate the appropriate <li>Locate the appropriate
DNAT rule. It will be in a chain called <i>&lt;source DNAT rule. It will be in a chain called <i>&lt;source
zone&gt;</i>_dnat ('net_dnat' in the above examples).</li> zone&gt;</i>_dnat ('net_dnat' in the above examples).</li>
<li>Is the packet count <li>Is the packet
in the first column non-zero? If so, the connection count in the first column non-zero? If so, the connection
request is reaching the firewall and is being redirected request is reaching the firewall and is being redirected
to the server. In this case, the problem is usually a missing to the server. In this case, the problem is usually a missing
or incorrect default gateway setting on the server (the or incorrect default gateway setting on the server (the
server's default gateway should be the IP address of the firewall's server's default gateway should be the IP address of the
interface to the server).</li> firewall's interface to the server).</li>
<li>If the packet count <li>If the packet
is zero:</li> count is zero:</li>
<ul> <ul>
<li>the connection <li>the connection
@ -443,13 +457,13 @@ my local network. External clients can browse http://www
an internet-accessible server in your local network an internet-accessible server in your local network
is like raising foxes in the corner of your hen house. is like raising foxes in the corner of your hen house.
If the server is compromised, there's nothing between If the server is compromised, there's nothing between
that server and your other internal systems. For the cost that server and your other internal systems. For the
of another NIC and a cross-over cable, you can put your cost of another NIC and a cross-over cable, you can put
server in a DMZ such that it is isolated from your local systems your server in a DMZ such that it is isolated from your local systems
- assuming that the Server can be located near the Firewall, - assuming that the Server can be located near the Firewall,
of course :-)</li> of course :-)</li>
<li>The accessibility <li>The
problem is best solved using <a accessibility problem is best solved using <a
href="shorewall_setup_guide.htm#DNS">Bind Version 9 "views"</a> href="shorewall_setup_guide.htm#DNS">Bind Version 9 "views"</a>
(or using a separate DNS server for local clients) such that www.mydomain.com (or using a separate DNS server for local clients) such that www.mydomain.com
resolves to 130.141.100.69 externally and 192.168.1.5 resolves to 130.141.100.69 externally and 192.168.1.5
@ -615,13 +629,14 @@ releases.<br>
<h4 align="left"><a name="faq2a"></a>2a. I have a zone "Z" with an RFC1918 <h4 align="left"><a name="faq2a"></a>2a. I have a zone "Z" with an RFC1918
subnet and I use static NAT to assign non-RFC1918 subnet and I use static NAT to assign non-RFC1918
addresses to hosts in Z. Hosts in Z cannot communicate addresses to hosts in Z. Hosts in Z cannot communicate
with each other using their external (non-RFC1918 addresses) with each other using their external (non-RFC1918
so they can't access each other using their DNS names.</h4> addresses) so they can't access each other using their DNS
names.</h4>
<p align="left"><b>Answer: </b>This is another problem that is best solved <p align="left"><b>Answer: </b>This is another problem that is best solved
using Bind Version 9 "views". It allows both using Bind Version 9 "views". It allows both
external and internal clients to access a NATed host external and internal clients to access a NATed
using the host's DNS name.</p> host using the host's DNS name.</p>
<p align="left">Another good way to approach this problem is to switch from <p align="left">Another good way to approach this problem is to switch from
static NAT to Proxy ARP. That way, the hosts static NAT to Proxy ARP. That way, the hosts
@ -638,7 +653,8 @@ Z-&gt;Z traffic through your firewall then:</p>
Example:</p> Example:</p>
<p align="left">Zone: dmz<br> <p align="left">Zone: dmz<br>
Interface: eth2<br> Interface:
eth2<br>
Subnet: 192.168.2.0/24</p> Subnet: 192.168.2.0/24</p>
<p align="left">In /etc/shorewall/interfaces:</p> <p align="left">In /etc/shorewall/interfaces:</p>
@ -682,7 +698,8 @@ Z-&gt;Z traffic through your firewall then:</p>
<td>dmz</td> <td>dmz</td>
<td>dmz</td> <td>dmz</td>
<td>ACCEPT</td> <td>ACCEPT</td>
<td> <br> <td>
<br>
</td> </td>
</tr> </tr>
@ -725,8 +742,8 @@ Z-&gt;Z traffic through your firewall then:</p>
href="http://www.kfki.hu/%7Ekadlec/sw/netfilter/newnat-suite/"> H.323 connection href="http://www.kfki.hu/%7Ekadlec/sw/netfilter/newnat-suite/"> H.323 connection
tracking/NAT module</a> that may help with Netmeeting. tracking/NAT module</a> that may help with Netmeeting.
Look <a href="http://linux-igd.sourceforge.net">here</a> for Look <a href="http://linux-igd.sourceforge.net">here</a> for
a solution for MSN IM but be aware that there are significant security a solution for MSN IM but be aware that there are significant
risks involved with this solution. Also check the Netfilter security risks involved with this solution. Also check the Netfilter
mailing list archives at <a mailing list archives at <a
href="http://www.netfilter.org">http://www.netfilter.org</a>. href="http://www.netfilter.org">http://www.netfilter.org</a>.
</p> </p>
@ -783,10 +800,10 @@ that attempt.<br>
<p align="left">a) Create /etc/shorewall/common if it doesn't already exist. <p align="left">a) Create /etc/shorewall/common if it doesn't already exist.
<br> <br>
b) Be sure that b) Be sure
the first command in the file is ". /etc/shorewall/common.def"<br> that the first command in the file is ". /etc/shorewall/common.def"<br>
c) Add the following c) Add the
to /etc/shorewall/common </p> following to /etc/shorewall/common </p>
<blockquote> <blockquote>
<p align="left">run_iptables -A icmpdef -p ICMP --icmp-type echo-request <p align="left">run_iptables -A icmpdef -p ICMP --icmp-type echo-request
@ -839,14 +856,14 @@ see "man syslog") in your <a href="Documentation.htm#Policy">policies</a>
<a href="http://gege.org/iptables">http://gege.org/iptables</a><br> <a href="http://gege.org/iptables">http://gege.org/iptables</a><br>
</p> </p>
</blockquote> </blockquote>
I personnaly use Logwatch. It emails I personnaly use Logwatch. It
me a report each day from my various systems with each emails me a report each day from my various systems with
report summarizing the logged activity on the corresponding each report summarizing the logged activity on the corresponding
system. system.
<h4 align="left"><b><a name="faq6b"></a>6b. DROP messages</b> on port 10619 <h4 align="left"><b><a name="faq6b"></a>6b. DROP messages</b> on port 10619
are <b>flooding the logs</b> with their connect requests. Can are <b>flooding the logs</b> with their connect requests. Can
i exclude these error messages for this port temporarily from logging i exclude these error messages for this port temporarily from
in Shorewall?</h4> logging in Shorewall?</h4>
Temporarily add the following rule:<br> Temporarily add the following rule:<br>
<pre> DROP net fw udp 10619</pre> <pre> DROP net fw udp 10619</pre>
@ -908,9 +925,9 @@ sample configurations available in the <a
<p align="left">The 'stop' command is intended to place your firewall into <p align="left">The 'stop' command is intended to place your firewall into
a safe state whereby only those hosts listed a safe state whereby only those hosts listed
in /etc/shorewall/routestopped' are activated. If in /etc/shorewall/routestopped' are activated.
you want to totally open up your firewall, you must use the If you want to totally open up your firewall, you must use
'shorewall clear' command. </p> the 'shorewall clear' command. </p>
<h4 align="left"><a name="faq8"></a>8. When I try to start Shorewall on RedHat, <h4 align="left"><a name="faq8"></a>8. When I try to start Shorewall on RedHat,
I get messages about insmod failing -- what's wrong?</h4> I get messages about insmod failing -- what's wrong?</h4>
@ -974,8 +991,8 @@ local zone is defined as all hosts connected through eth1</p>
<h4 align="left"><a name="faq12"></a>12. Is there a GUI?</h4> <h4 align="left"><a name="faq12"></a>12. Is there a GUI?</h4>
<p align="left"><b>Answer: </b>Yes. Shorewall support is included in Webmin <p align="left"><b>Answer: </b>Yes. Shorewall support is included in Webmin
1.060 and later versions. See <a href="http://www.webmin.com">http://www.webmin.com</a> 1.060 and later versions. See <a
</p> href="http://www.webmin.com">http://www.webmin.com</a> </p>
<h4 align="left"> <a name="faq13"></a>13. Why do you call it "Shorewall"?</h4> <h4 align="left"> <a name="faq13"></a>13. Why do you call it "Shorewall"?</h4>
@ -993,8 +1010,8 @@ enable rfc1918 blocking for my eth0 interface (the internet
<p align="left">Is there any way it can add a rule before the rfc1918 blocking <p align="left">Is there any way it can add a rule before the rfc1918 blocking
that will let all traffic to and from the 192.168.100.1 that will let all traffic to and from the 192.168.100.1
address of the modem in/out but still block all other address of the modem in/out but still block all
rfc1918 addresses?</p> other rfc1918 addresses?</p>
<p align="left"><b>Answer: </b>If you are running a version of Shorewall <p align="left"><b>Answer: </b>If you are running a version of Shorewall
earlier than 1.3.1, create /etc/shorewall/start and in it, place the earlier than 1.3.1, create /etc/shorewall/start and in it, place the
@ -1091,10 +1108,10 @@ its lease.</h4>
the net</h4> the net</h4>
<p align="left"><b>Answer: </b>Every time I read "systems can't see out to <p align="left"><b>Answer: </b>Every time I read "systems can't see out to
the net", I wonder where the poster bought computers the net", I wonder where the poster bought
with eyes and what those computers will "see" when computers with eyes and what those computers will
things are working properly. That aside, the most "see" when things are working properly. That aside,
common causes of this problem are:</p> the most common causes of this problem are:</p>
<ol> <ol>
<li> <li>
@ -1111,8 +1128,8 @@ common causes of this problem are:</p>
<p align="left">The DNS settings on the local systems are wrong or the <p align="left">The DNS settings on the local systems are wrong or the
user is running a DNS server on the firewall user is running a DNS server on the firewall
and hasn't enabled UDP and TCP port 53 from the and hasn't enabled UDP and TCP port 53 from
firewall to the internet.</p> the firewall to the internet.</p>
</li> </li>
</ol> </ol>
@ -1125,8 +1142,8 @@ common causes of this problem are:</p>
the 'dmesg' man page ("man dmesg"). You must add a suitable 'dmesg' command the 'dmesg' man page ("man dmesg"). You must add a suitable 'dmesg' command
to your startup scripts or place it in /etc/shorewall/start. to your startup scripts or place it in /etc/shorewall/start.
Under RedHat, the max log level that is sent Under RedHat, the max log level that is sent
to the console is specified in /etc/sysconfig/init in to the console is specified in /etc/sysconfig/init
the LOGLEVEL variable.<br> in the LOGLEVEL variable.<br>
</p> </p>
<h4><a name="faq17"></a>17. How do I find out why this traffic is getting <h4><a name="faq17"></a>17. How do I find out why this traffic is getting
@ -1146,9 +1163,9 @@ the 'dmesg' man page ("man dmesg"). You must add a suitable 'dmesg' command
href="Documentation.htm#rfc1918">/etc/shorewall/rfc1918.</a></li> href="Documentation.htm#rfc1918">/etc/shorewall/rfc1918.</a></li>
<li><b>all2&lt;zone&gt;</b>, <li><b>all2&lt;zone&gt;</b>,
<b>&lt;zone&gt;2all</b> or <b>all2all <b>&lt;zone&gt;2all</b> or <b>all2all
</b>- You have a<a href="Documentation.htm#Policy"> policy</a> that </b>- You have a<a href="Documentation.htm#Policy"> policy</a>
specifies a log level and this packet is being logged that specifies a log level and this packet is being
under that policy. If you intend to ACCEPT this traffic logged under that policy. If you intend to ACCEPT this traffic
then you need a <a href="Documentation.htm#Rules">rule</a> to that effect.<br> then you need a <a href="Documentation.htm#Rules">rule</a> to that effect.<br>
</li> </li>
<li><b>&lt;zone1&gt;2&lt;zone2&gt; <li><b>&lt;zone1&gt;2&lt;zone2&gt;
@ -1165,8 +1182,8 @@ includes a log level.</li>
<li><b>logpkt</b> <li><b>logpkt</b>
- The packet is being logged under the <b>logunclean</b> - The packet is being logged under the <b>logunclean</b>
<a href="Documentation.htm#Interfaces">interface option</a>.</li> <a href="Documentation.htm#Interfaces">interface option</a>.</li>
<li><b>badpkt </b>- <li><b>badpkt
The packet is being logged under the <b>dropunclean</b> </b>- The packet is being logged under the <b>dropunclean</b>
<a href="Documentation.htm#Interfaces">interface option</a> <a href="Documentation.htm#Interfaces">interface option</a>
as specified in the <b>LOGUNCLEAN </b>setting in <a as specified in the <b>LOGUNCLEAN </b>setting in <a
href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</a>.</li> href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf</a>.</li>
@ -1175,11 +1192,12 @@ includes a log level.</li>
is blacklisted in the<a href="Documentation.htm#Blacklist"> /etc/shorewall/blacklist is blacklisted in the<a href="Documentation.htm#Blacklist"> /etc/shorewall/blacklist
</a>file.</li> </a>file.</li>
<li><b>newnotsyn <li><b>newnotsyn
</b>- The packet is being logged because it is a </b>- The packet is being logged because it is
TCP packet that is not part of any current connection yet a TCP packet that is not part of any current connection
it is not a syn packet. Options affecting the logging of such yet it is not a syn packet. Options affecting the logging
packets include <b>NEWNOTSYN </b>and <b>LOGNEWNOTSYN of such packets include <b>NEWNOTSYN </b>and
</b>in <a href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a></li> <b>LOGNEWNOTSYN </b>in <a
href="Documentation.htm#Conf">/etc/shorewall/shorewall.conf.</a></li>
<li><b>INPUT</b> <li><b>INPUT</b>
or <b>FORWARD</b> - The packet has a source IP address or <b>FORWARD</b> - The packet has a source IP address
that isn't in any of your defined zones ("shorewall check" that isn't in any of your defined zones ("shorewall check"
@ -1197,9 +1215,9 @@ packet is being logged because it failed the checks implemen
<h4><a name="faq18"></a>18. Is there any way to use <b>aliased ip addresses</b> <h4><a name="faq18"></a>18. Is there any way to use <b>aliased ip addresses</b>
with Shorewall, and maintain separate rulesets for with Shorewall, and maintain separate rulesets for
different IPs?</h4> different IPs?</h4>
<b>Answer: </b>Yes. See <b>Answer: </b>Yes.
<a href="Shorewall_and_Aliased_Interfaces.html">Shorewall and Aliased Interfaces</a>. See <a href="Shorewall_and_Aliased_Interfaces.html">Shorewall and Aliased
Interfaces</a>.
<h4><b><a name="faq19"></a>19. </b>I have added entries to /etc/shorewall/tcrules <h4><b><a name="faq19"></a>19. </b>I have added entries to /etc/shorewall/tcrules
but they don't seem to do anything. Why?</h4> but they don't seem to do anything. Why?</h4>
You probably haven't set You probably haven't set
@ -1225,11 +1243,11 @@ rules for your server.<br>
192.0.2.3 is external on my 192.0.2.3 is external on my
firewall... 172.16.0.0/24 is my internal LAN<br> firewall... 172.16.0.0/24 is my internal LAN<br>
<br> <br>
<b>Answer: </b>While most people <b>Answer: </b>While most
associate the Internet Control Message Protocol (ICMP) people associate the Internet Control Message Protocol
with 'ping', ICMP is a key piece of the internet. ICMP is (ICMP) with 'ping', ICMP is a key piece of the internet.
used to report problems back to the sender of a packet; this ICMP is used to report problems back to the sender of a packet;
is what is happening here. Unfortunately, where NAT is involved this is what is happening here. Unfortunately, where NAT is involved
(including SNAT, DNAT and Masquerade), there are a lot of broken (including SNAT, DNAT and Masquerade), there are a lot of broken
implementations. That is what you are seeing with these messages.<br> implementations. That is what you are seeing with these messages.<br>
<br> <br>
@ -1237,9 +1255,9 @@ implementations. That is what you are seeing with these messages.<br>
what is happening -- to confirm this analysis, one would what is happening -- to confirm this analysis, one would
have to have packet sniffers placed a both ends of the connection.<br> have to have packet sniffers placed a both ends of the connection.<br>
<br> <br>
Host 172.16.1.10 behind NAT gateway Host 172.16.1.10 behind NAT
206.124.146.179 sent a UDP DNS query to 192.0.2.3 and gateway 206.124.146.179 sent a UDP DNS query to 192.0.2.3
your DNS server tried to send a response (the response information and your DNS server tried to send a response (the response information
is in the brackets -- note source port 53 which marks this as is in the brackets -- note source port 53 which marks this as
a DNS reply). When the response was returned to to 206.124.146.179, a DNS reply). When the response was returned to to 206.124.146.179,
it rewrote the destination IP TO 172.16.1.10 and forwarded the it rewrote the destination IP TO 172.16.1.10 and forwarded the
@ -1249,17 +1267,17 @@ back to 192.0.2.3. As this packet is sent back through 206.124.146.179,
that box correctly changes the source address in the packet to 206.124.146.179 that box correctly changes the source address in the packet to 206.124.146.179
but doesn't reset the DST IP in the original DNS response similarly. but doesn't reset the DST IP in the original DNS response similarly.
When the ICMP reaches your firewall (192.0.2.3), your firewall has When the ICMP reaches your firewall (192.0.2.3), your firewall has
no record of having sent a DNS reply to 172.16.1.10 so this ICMP doesn't no record of having sent a DNS reply to 172.16.1.10 so this ICMP
appear to be related to anything that was sent. The final result doesn't appear to be related to anything that was sent. The final
is that the packet gets logged and dropped in the all2all chain. I result is that the packet gets logged and dropped in the all2all chain.
have also seen cases where the source IP in the ICMP itself isn't set I have also seen cases where the source IP in the ICMP itself isn't
back to the external IP of the remote NAT gateway; that causes your set back to the external IP of the remote NAT gateway; that causes your
firewall to log and drop the packet out of the rfc1918 chain because firewall to log and drop the packet out of the rfc1918 chain because
the source IP is reserved by RFC 1918.<br> the source IP is reserved by RFC 1918.<br>
<h4><a name="faq22"></a><b>22. </b>I have some <b>iptables commands </b>that <h4><a name="faq22"></a><b>22. </b>I have some <b>iptables commands </b>that
I want to <b>run when Shorewall starts.</b> Which file do I want to <b>run when Shorewall starts.</b> Which file
I put them in?</h4> do I put them in?</h4>
You can place these commands You can place these commands
in one of the <a href="shorewall_extension_scripts.htm">Shorewall Extension in one of the <a href="shorewall_extension_scripts.htm">Shorewall Extension
Scripts</a>. Be sure that you look at the contents of the chain(s) Scripts</a>. Be sure that you look at the contents of the chain(s)
@ -1274,10 +1292,10 @@ or REJECT rule and any rules that you add after that will be ignored.
<h4><a name="faq23"></a><b>23. </b>Why do you use such ugly fonts on your <h4><a name="faq23"></a><b>23. </b>Why do you use such ugly fonts on your
web site?</h4> web site?</h4>
The Shorewall web site is almost font The Shorewall web site is almost font
neutral (it doesn't explicitly specify fonts except on a few neutral (it doesn't explicitly specify fonts except on a
pages) so the fonts you see are largely the default fonts configured few pages) so the fonts you see are largely the default fonts
in your browser. If you don't like them then reconfigure your configured in your browser. If you don't like them then reconfigure
browser.<br> your browser.<br>
<h4><a name="faq24"></a>24. How can I <b>allow conections</b> to let's say <h4><a name="faq24"></a>24. How can I <b>allow conections</b> to let's say
the ssh port only<b> from specific IP Addresses</b> on the the ssh port only<b> from specific IP Addresses</b> on the
@ -1305,13 +1323,30 @@ in nmap on or behind the firewall, I get "operation not permitted". How can
I use nmap with Shorewall?"</h4> I use nmap with Shorewall?"</h4>
Edit /etc/shorewall/shorewall.conf and change "NEWNOTSYN=No" to "NEWNOTSYN=Yes" Edit /etc/shorewall/shorewall.conf and change "NEWNOTSYN=No" to "NEWNOTSYN=Yes"
then restart Shorewall.<br> then restart Shorewall.<br>
<h4><a name="faq27">27. I'm compiling a new kernel for my firewall. What should
I look out for?</a></h4>
First take a look at the <a href="kernel.htm">Shorewall kernel configuration
page</a>. You probably also want to be sure that you have selected the "<b>NAT
of local connections (READ HELP)</b>" on the Netfilter Configuration menu.
Otherwise, DNAT rules with your firewall as the source zone won't work with
your new kernel.<br>
<h4><a name="faq28"></a>28. How do I use Shorewall as a Bridging Firewall?<br>
</h4>
Basically, you don't. While there are kernel patches that allow you to route
bridge traffic through Netfilter, the environment is so different from the
Layer 3 firewalling environment that very little of Shorewall works. In fact,
so much of Shorewall doesn't work that my official position is that "Shorewall
doesn't work with Layer 2 Bridging".<br>
<br> <br>
<font size="2">Last updated 7/5/2003 - <a <font size="2">Last updated 7/9/2003 - <a
href="support.htm">Tom Eastep</a></font> href="support.htm">Tom Eastep</a></font>
<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> <br>
<br> <br>
<br>
<br>
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@ -0,0 +1,50 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>What Shorewall Cannot Do</title>
<meta http-equiv="content-type"
content="text/html; charset=ISO-8859-1">
<meta name="author" content="Tom Eastep">
</head>
<body>
<small> </small><small>
</small><small>
</small><small>
</small><small>
</small> <small> </small>
<table border="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse;" width="100%" id="AutoNumber4"
bgcolor="#400169" height="90">
<tbody>
<tr>
<td width="100%"><small> </small>
<h1 align="center"><small><font color="#ffffff">Some things that Shorewall
<b>Cannot</b> Do</font></small></h1>
<small> </small></td>
</tr>
</tbody>
</table>
<small><br>
</small>Shorewall cannot:<br>
<ul>
<li>Be used on a Linux System that is functioning as a Layer 2 Bridge</li>
<li>Act as a "Personal Firewall" that allows internet access by application.</li>
<li>Do content filtering -- better to use <a
href="Shorewall_Squid_Usage.html">Squid</a> for that.<br>
</li>
</ul>
<br>
<font size="2">Last updated 7/9/2003 - <a href="support.htm">Tom Eastep</a></font>
<p><a href="copyright.htm"><font size="2">Copyright</font> &copy; <font
size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
</p>
<br>
<br>
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@ -12,8 +12,8 @@
<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>
@ -38,6 +38,8 @@
href="seattlefirewall_index.htm">Home</a></li> href="seattlefirewall_index.htm">Home</a></li>
<li> <a <li> <a
href="shorewall_features.htm">Features</a></li> href="shorewall_features.htm">Features</a></li>
<li><a href="Shorewall_Doesnt.html">What it Cannot Do</a><br>
</li>
<li> <a <li> <a
href="shorewall_prerequisites.htm">Requirements</a></li> href="shorewall_prerequisites.htm">Requirements</a></li>
<li> <a <li> <a
@ -50,8 +52,9 @@
<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
@ -71,8 +74,8 @@
<li><a href="1.3" <li><a href="1.3"
target="_top">Shorewall 1.3 Site</a></li> target="_top">Shorewall 1.3 Site</a></li>
<li><a <li><a
href="http://www1.shorewall.net/1.2/index.htm" target="_top">Shorewall href="http://www1.shorewall.net/1.2/index.htm" target="_top">Shorewall 1.2
1.2 Site</a></li> Site</a></li>
<li><a href="shorewall_mirrors.htm">Mirrors</a> <li><a href="shorewall_mirrors.htm">Mirrors</a>
@ -137,5 +140,6 @@
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001-2003 Thomas M. Eastep.</font></a><br> size="2">2001-2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
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@ -38,6 +38,8 @@
href="seattlefirewall_index.htm">Home</a></li> href="seattlefirewall_index.htm">Home</a></li>
<li> <a <li> <a
href="shorewall_features.htm">Features</a></li> href="shorewall_features.htm">Features</a></li>
<li><a href="Shorewall_Doesnt.html">What it Cannot Do</a><br>
</li>
<li> <a <li> <a
href="shorewall_prerequisites.htm">Requirements</a></li> href="shorewall_prerequisites.htm">Requirements</a></li>
<li> <a <li> <a
@ -71,11 +73,12 @@
</li> </li>
<li><a href="1.3" target="_top">Shorewall 1.3 Site</a></li> <li><a href="1.3" target="_top">Shorewall 1.3 Site</a></li>
<li><a <li><a
href="http://www1.shorewall.net/1.2/index.htm" target="_top">Shorewall 1.2 href="http://www1.shorewall.net/1.2/index.htm" target="_top">Shorewall
Site</a></li> 1.2 Site</a></li>
<li><a href="shorewall_mirrors.htm">Mirrors</a> <li><a href="shorewall_mirrors.htm">Mirrors</a>
<ul> <ul>
<li><a <li><a
target="_top" href="http://slovakia.shorewall.net">Slovak Republic</a></li> target="_top" href="http://slovakia.shorewall.net">Slovak Republic</a></li>
@ -136,5 +139,6 @@ Site</a></li>
<p><a href="copyright.htm"><font size="2">Copyright</font> © <font <p><a href="copyright.htm"><font size="2">Copyright</font> © <font
size="2">2001-2003 Thomas M. Eastep.</font></a><br> size="2">2001-2003 Thomas M. Eastep.</font></a><br>
</p> </p>
<br>
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@ -75,14 +75,14 @@
<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 at <p align="left">You can report such problems by sending mail to tmeastep
hotmail dot com.</p> at 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 checks <p>Please note that the mail server at shorewall.net
incoming mail:<br> checks incoming mail:<br>
</p> </p>
<ol> <ol>
@ -96,31 +96,24 @@ incoming mail:<br>
A or MX record in DNS.</li> 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>
<li>to ensure that the sending system has a valid PTR record in DNS.</li>
</ol> </ol>
<big><font color="#cc0000"><b>This last point is important. 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 unless/until the postmaster notices that your
posts are being rejected. 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 as the one at your ISP). </b></font></big><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 to rejecting all HTML traffic. At least one MTA has gone so far as
blacklist shorewall.net "for continuous abuse" because it has been my to blacklist shorewall.net "for continuous abuse" because it has been
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 the planet of HTML based e-mail". Nevertheless, to allow subscribers to
to receive list posts as must as possible, I have now configured the receive list posts as must as possible, I have now configured the list
list server at shorewall.net to strip all HTML from outgoing posts. server at shorewall.net to strip all HTML from outgoing posts. This
This means that HTML-only posts will be bounced by the list server.<br> 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>
@ -156,34 +149,34 @@ This means that HTML-only posts will be bounced by the list server.<br>
<option value="revtime">Reverse Time </option> <option value="revtime">Reverse Time </option>
<option value="revtitle">Reverse Title </option> <option value="revtitle">Reverse Title </option>
</select> </select>
</font> <input type="hidden" name="config" </font> <input type="hidden"
value="htdig"> <input type="hidden" name="restrict" name="config" value="htdig"> <input type="hidden" name="restrict"
value="[http://lists.shorewall.net/pipermail/.*]"> <input type="hidden" value="[http://lists.shorewall.net/pipermail/.*]"> <input type="hidden"
name="exclude" value=""> <br> name="exclude" value=""> <br>
Search: <input type="text" size="30" Search: <input type="text" size="30"
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 entire <h2 align="left"><font color="#ff0000">Please do not try to download the
Archive -- it is 75MB (and growing daily) and my slow DSL line simply won't entire Archive -- it is 75MB (and growing daily) and my slow DSL line simply
stand the traffic. If I catch you, you will be blacklisted.<br> won't 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), by Shoreline Firewall (such as the one used on my web site), you
you may <a href="Shorewall_CA_html.html">download and install my CA certificate</a> 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 then you can either use unencrypted access when subscribing to Shorewall
Shorewall mailing lists or you can use secure access (SSL) and mailing lists or you can use secure access (SSL) and accept the
accept the server's certificate when prompted by your browser.<br> 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 of general interest to the Shorewall user community is also posted
posted to this list.</p> 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
@ -207,9 +200,9 @@ 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 <p align="left">Note that prior to 1/1/2002, the mailing list was hosted at
at <a href="http://sourceforge.net">Sourceforge</a>. The archives from that <a href="http://sourceforge.net">Sourceforge</a>. The archives from that list
list may be found at <a 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>
@ -294,11 +287,12 @@ emailed to you.</p>
<p align="left"><a href="gnu_mailman.htm">Check out these instructions</a></p> <p align="left"><a href="gnu_mailman.htm">Check out these instructions</a></p>
<p align="left"><font size="2">Last updated 6/14/2003 - <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>
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@ -24,7 +24,10 @@
</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 change
coming in Shorewall version 1.4.0. <br> coming in Shorewall version 1.4.0. To find out which version of 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
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
@ -51,8 +54,8 @@ form:<br>
<blockquote> <blockquote>
<pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre> <pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre>
</blockquote> </blockquote>
With that rule in place, if you want to ignore 'ping' from z1 to z2 then With that rule in place, if you want to ignore 'ping' from z1 to z2
you need a rule of the form:<br> then you need a rule of the form:<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp; <blockquote>DROP&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>
@ -90,8 +93,8 @@ need a rule in /etc/shoreall/rules of the form:<br>
<blockquote> <blockquote>
<pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre> <pre><b><font color="#009900">run_iptables -A icmpdef -p icmp --icmp-type 8 -j ACCEPT<br></font></b></pre>
</blockquote> </blockquote>
With that rule in place, if you want to ignore 'ping' from z1 to z2 then With that rule in place, if you want to ignore 'ping' from z1 to z2
you need a rule of the form:<br> then you need a rule of the form:<br>
<blockquote>DROP&nbsp;&nbsp;&nbsp; <i>z1&nbsp;&nbsp;&nbsp; z2&nbsp;&nbsp;&nbsp; <blockquote>DROP&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>
@ -111,8 +114,8 @@ need a rule in /etc/shoreall/rules of the form:<br>
There are several aspects to the old Shorewall Ping management:<br> There are several aspects to the old Shorewall Ping management:<br>
<ol> <ol>
<li>The <b>noping</b> and <b>filterping </b>interface options in <a <li>The <b>noping</b> and <b>filterping </b>interface options in
href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>.</li> <a href="Documentation.htm#Interfaces">/etc/shorewall/interfaces</a>.</li>
<li>The <b>FORWARDPING</b> option in<a <li>The <b>FORWARDPING</b> option in<a
href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf</a>.</li> href="Documentation.htm#Conf"> /etc/shorewall/shorewall.conf</a>.</li>
<li>Explicit rules in <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li> <li>Explicit rules in <a href="Documentation.htm#Rules">/etc/shorewall/rules</a>.</li>
@ -123,8 +126,8 @@ need a rule in /etc/shoreall/rules of the form:<br>
<ol> <ol>
<li>Ping requests addressed to the firewall itself; and</li> <li>Ping requests addressed to the firewall itself; and</li>
<li>Ping requests being forwarded to another system. Included here <li>Ping requests being forwarded to another system. Included here
are all cases of packet forwarding including NAT, DNAT rule, Proxy ARP and are all cases of packet forwarding including NAT, DNAT rule, Proxy ARP
simple routing.</li> and simple routing.</li>
</ol> </ol>
These cases will be covered separately.<br> These cases will be covered separately.<br>
@ -133,13 +136,13 @@ simple routing.</li>
For ping requests addressed to the firewall, the sequence is as follows:<br> For ping requests addressed to the firewall, the sequence is as follows:<br>
<ol> <ol>
<li>If neither <b>noping</b> nor <b>filterping </b>are specified for <li>If neither <b>noping</b> nor <b>filterping </b>are specified
the interface that receives the ping request then the request will be responded for the interface that receives the ping request then the request will
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 request <li>If <b>filterping </b>is specified for the interface then the
is passed to the rules/policy evaluation.</li> request is passed to the rules/policy evaluation.</li>
</ol> </ol>
@ -177,16 +180,11 @@ request is either rejected or simply ignored.</li>
</ol> </ol>
<p><font size="2">Updated 5/4/2003 - <a href="support.htm">Tom Eastep</a> <p><font size="2">Updated 7/7/2003 - <a href="support.htm">Tom Eastep</a>
</font></p> </font></p>
<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></p> size="2">2001, 2002, 2003 Thomas M. Eastep.</font></a><br>
<br> </p>
<br>
<br>
<br>
<br>
<br>
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117
Shorewall-docs/seattlefirewall_index.htm
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@ -71,9 +71,9 @@
<p>The Shoreline Firewall, more commonly known as "Shorewall", is <p>The Shoreline Firewall, more commonly known as "Shorewall", is a
a <a href="http://www.netfilter.org">Netfilter</a> (iptables) based <a href="http://www.netfilter.org">Netfilter</a> (iptables) based firewall
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
gateway/router/server or on a standalone GNU/Linux system.</p> gateway/router/server or on a standalone GNU/Linux system.</p>
@ -83,18 +83,18 @@ firewall that can be used on a dedicated firewall system, a multi-functio
<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 in
the hope that it will be useful, but 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>
@ -119,9 +119,10 @@ General Public License for more details.<br>
<h2>Getting Started with Shorewall</h2> <h2>Getting Started with Shorewall</h2>
New to Shorewall? Start by selecting the <a New to Shorewall? Start by selecting the
href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that most closely <a href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that
match your environment and follow the step by step instructions.<br> most closely match your environment and follow the step 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
@ -142,20 +143,28 @@ Index</a> is a good place to start as is the Quick Search to your right.
<p><b></b></p> <p><b></b></p>
<ol> <ol>
</ol> </ol>
<p><b>7/7/2003 - Shorewall-1.4.6 Beta 2</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>
<a href="ftp://shorewall.net/pub/shorewall/testing"
target="_top">ftp://shorewall.net/pub/shorewall/testing</a><br>
</b></p>
</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 start <li>A problem seen on RH7.3 systems where Shorewall encountered
errors when started using the "service" mechanism has been worked around.<br> start errors when started using the "service" mechanism has been worked
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 a
@ -166,7 +175,13 @@ a single DNAT rule with multiple "--to-destination" clauses.<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 a "-"
were mis-handled when they appeared in the DEST column of a rule.<br> were mis-handled when they appeared in the DEST column of a rule.<br>
<br>
</li> </li>
<li>A number of problems with rule parsing have been corrected. Corrections
involve the handling of "z1!z2" in the SOURCE column as well as lists in
the ORIGINAL DESTINATION column.<br>
</li>
</ol> </ol>
<p><b>Migration Issues:</b><br> <p><b>Migration Issues:</b><br>
@ -188,6 +203,7 @@ entries of the following format:<br>
removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically
detected by Shorewall (see below).<br> detected by Shorewall (see below).<br>
</li> </li>
</ol> </ol>
<p><b>New Features:</b><br> <p><b>New Features:</b><br>
@ -208,19 +224,19 @@ for packets arriving on the associated interface.<br>
first one on an interface.<br> first one on an interface.<br>
<br> <br>
</li> </li>
<li>DNAT[-] rules may now be used to load balance (round-robin) over <li>DNAT[-] rules may now be used to load balance (round-robin)
a set of servers. Servers may be specified in a range of addresses given over a set of servers. Servers may be specified in a range of addresses
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>
<br> <br>
    DNAT net loc:192.168.10.2-192.168.10.5 tcp 80<br>     DNAT net loc:192.168.10.2-192.168.10.5 tcp 80<br>
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration options <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration
have been removed and have been replaced by code that detects whether these options have been removed and have been replaced by code that detects whether
capabilities are present in the current kernel. The output of the start, these capabilities are present in the current kernel. The output of the
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>
   NAT: Available<br>    NAT: Available<br>
@ -231,10 +247,10 @@ restart and check commands have been enhanced to report the outcome:<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 and
allows for rules which match against elements in netfilter's connection allows for rules which match against elements in netfilter's connection tracking
tracking table. Shorewall automatically detects the availability of this table. Shorewall automatically detects the availability of this extension
extension and reports its availability in the output of the start, restart and reports its availability in the output of the start, restart and check
and check commands.<br> 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>
@ -243,12 +259,13 @@ and check commands.<br>
   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 changed If this extension is available, the ruleset generated by Shorewall is
in the following ways:</li> 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 chains in the mangle table but will rather do all 'norfc1918' filtering in
in the filter table (rfc1918 chain).</li> 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 rules;
one in the nat table and one in the filter table. If the Connection Tracking one in the nat table and one in the filter table. If the Connection Tracking
Match Extension is available, the rule in the filter table is extended to Match Extension is available, the rule in the filter table is extended to
@ -256,6 +273,7 @@ check that the original destination address was the same as specified (or
defaulted to) in the DNAT rule.<br> defaulted to) in the DNAT rule.<br>
<br> <br>
</li> </li>
</ul> </ul>
<li>The shell used to interpret the firewall script (/usr/share/shorewall/firewall) <li>The shell used to interpret the firewall script (/usr/share/shorewall/firewall)
may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf.<br> may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf.<br>
@ -324,7 +342,9 @@ then the range may not span 128.0.0.0.<br>
<br> <br>
    foo    eth1:192.168.1.0/24,192.168.2.0/24<br>     foo    eth1:192.168.1.0/24,192.168.2.0/24<br>
</li> </li>
</ol> </ol>
<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>
@ -345,10 +365,10 @@ file; previously, INCLUDE in that file was ignored.</li>
</p> </p>
<ol> <ol>
<li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-] rule <li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-]
may now contain a list of addresses. If the list begins with "!' then rule may now contain a list of addresses. If the list begins with "!'
the rule will take effect only if the original destination address in then the rule will take effect only if the original destination address
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>
@ -356,24 +376,28 @@ the connection request does not match any of the addresses listed.</li>
</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 and iptables 1.2.8 (using the "official" RPM from netfilter.org). No problems
problems have been encountered with this set of software. The Shorewall have been encountered with this set of software. The Shorewall version
version is 1.4.4b plus the accumulated changes for 1.4.5.<br> 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>
<p>Thanks to Francesca Smith, the samples have been updated to Shorewall <p>Thanks to Francesca Smith, the samples have been updated to Shorewall
version 1.4.4.</p> version 1.4.4.</p>
<p><b></b></p> <p><b></b></p>
<ol> <ol>
</ol> </ol>
<p><a href="News.htm">More News</a></p> <p><a href="News.htm">More News</a></p>
@ -395,8 +419,8 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.<br>
</a></p> </a></p>
<b>Congratulations to Jacques and Eric on the recent <b>Congratulations to Jacques and Eric on the
release of Bering 1.2!!! </b><br> recent release of Bering 1.2!!! </b><br>
@ -477,11 +501,11 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.<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 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>
@ -493,8 +517,9 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.<br>
</table> </table>
<p><font size="2">Updated 7/7/2003 - <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>
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@ -6,6 +6,7 @@
content="text/html; charset=windows-1252"> content="text/html; charset=windows-1252">
<title>About the Shorewall Author</title> <title>About the Shorewall Author</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">
@ -29,7 +30,7 @@
</table> </table>
<p align="center"> <img border="3" src="images/Tom.jpg" <p align="center"> <img border="3" src="images/Tom.jpg"
alt="Tom - June 2003" width="640" height="480"> alt="Aging Geek - June 2003" width="320" height="240">
</p> </p>
<p align="center">Tom -- June 2003<br> <p align="center">Tom -- June 2003<br>
@ -64,8 +65,8 @@ 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> where href="http://www.cityofshoreline.com">Shoreline, Washington</a>
I live with my wife Tarry.  </p> where I live with my wife Tarry.  </p>
<p>Our current home network consists of: </p> <p>Our current home network consists of: </p>
@ -75,17 +76,17 @@ I live with my wife Tarry.
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,
LNE100TX(Tulip) NIC - My personal Linux System which runs Samba. LNE100TX(Tulip) NIC - My personal Linux System which runs
This system also has <a href="http://www.vmware.com/">VMware</a> Samba. This system also has <a href="http://www.vmware.com/">VMware</a>
installed and can run both <a href="http://www.debian.org">Debian installed and can run both <a href="http://www.debian.org">Debian
Woody</a> and <a href="http://www.suse.com">SuSE 8.1</a> in virtual Woody</a> and <a href="http://www.suse.com">SuSE 8.1</a> in virtual
machines.</li> machines.</li>
<li>K6-2/350, RH8.0, 384MB RAM, 8GB IDE HD, EEPRO100 <li>K6-2/350, RH8.0, 384MB RAM, 8GB IDE HD,
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 HD <li>PII/233, RH8.0, 256MB MB RAM, 2GB SCSI
- 3 LNE100TX  (Tulip) and 1 TLAN NICs  - Firewall running Shorewall HD - 3 LNE100TX  (Tulip) and 1 TLAN NICs  - Firewall running Shorewall
1.4.4c, 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, RTL8139
NIC - My wife's personal system.</li> 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
@ -125,11 +126,12 @@ FTP (Pure_ftpd), DNS server (Bind 9).</li>
height="75" border="0"> height="75" border="0">
</a><a href="http://www.opera.com"> </a> </font></p> </a><a href="http://www.opera.com"> </a> </font></p>
<p><font size="2">Last updated 6/15/2003 - </font><font size="2"> <a <p><font size="2">Last updated 7/14/2003 - </font><font size="2"> <a
href="support.htm">Tom Eastep</a></font> </p> href="support.htm">Tom Eastep</a></font> </p>
<font face="Trebuchet MS"><a <font face="Trebuchet MS"><a
href="copyright.htm"><font size="2">Copyright</font> © <font href="copyright.htm"><font size="2">Copyright</font> © <font
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>
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@ -30,17 +30,17 @@
Shorewall Requires:<br> Shorewall Requires:<br>
<ul> <ul>
<li>A kernel that supports netfilter. I've tested with 2.4.2 - 2.4.20. <li>A kernel that supports netfilter. I've tested with 2.4.2 -
With current releases of Shorewall, Traffic Shaping/Control requires at 2.4.20. With current releases of Shorewall, Traffic Shaping/Control requires
least 2.4.18.  <a href="kernel.htm"> Check here for kernel configuration at least 2.4.18.  <a href="kernel.htm"> Check here for kernel
information.</a> If you are looking for a firewall for use with configuration information.</a> If you are looking for a firewall
2.2 kernels, <a href="http://seawall.sf.net"> see the Seattle for use with 2.2 kernels, <a href="http://seawall.sf.net"> see
Firewall site</a> .</li> the Seattle Firewall site</a> .</li>
<li>iptables 1.2 or later but beware version 1.2.3 -- see the <a <li>iptables 1.2 or later but beware version 1.2.3 -- see the
href="errata.htm">Errata</a>. <font color="#ff0000"><b>WARNING: </b></font>The <a href="errata.htm">Errata</a>. <font color="#ff0000"><b>WARNING:
buggy iptables version 1.2.3 is included in RedHat 7.2 and you should </b></font>The buggy iptables version 1.2.3 is included in RedHat
upgrade to iptables 1.2.4 prior to installing Shorewall. Version 1.2.4 7.2 and you should upgrade to iptables 1.2.4 prior to installing Shorewall.
is available <a Version 1.2.4 is available <a
href="http://www.redhat.com/support/errata/RHSA-2001-144.html">from RedHat</a> href="http://www.redhat.com/support/errata/RHSA-2001-144.html">from RedHat</a>
and in the <a href="errata.htm">Shorewall Errata</a>. </li> and in the <a href="errata.htm">Shorewall Errata</a>. </li>
<li>Iproute ("ip" utility). The iproute package is included <li>Iproute ("ip" utility). The iproute package is included
@ -52,8 +52,9 @@ with most distributions but may not be installed by default. The official
must have correct support for variable expansion formats ${<i>variable</i>%<i>pattern</i> must have correct support for variable expansion formats ${<i>variable</i>%<i>pattern</i>
}, ${<i>variable</i>%%<i>pattern</i>}, ${<i>variable</i>#<i>pattern</i> }, ${<i>variable</i>%%<i>pattern</i>}, ${<i>variable</i>#<i>pattern</i>
} and ${<i>variable</i>##<i>pattern</i>}.</li> } and ${<i>variable</i>##<i>pattern</i>}.</li>
<li>Must produce a sensible result when a number n (128 &lt;= n &lt;= 255) <li>Your shell must produce a sensible result when a number n (128 &lt;=
is left shifted by 24 bits. You can check this at a shell prompt by:</li> n &lt;= 255) is left shifted by 24 bits. You can check this at a shell prompt
by:</li>
<ul> <ul>
<li>echo $((128 &lt;&lt; 24))<br> <li>echo $((128 &lt;&lt; 24))<br>
@ -62,12 +63,12 @@ is left shifted by 24 bits. You can check this at a shell prompt by:</li>
</li> </li>
</ul> </ul>
<li>The firewall monitoring display is greatly improved if you have <li>The firewall monitoring display is greatly improved if you
awk (gawk) installed.</li> have awk (gawk) installed.</li>
</ul> </ul>
<p align="left"><font size="2">Last updated 7/4/2003 - <a <p align="left"><font size="2">Last updated 7/8/2003 - <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
@ -79,5 +80,6 @@ is left shifted by 24 bits. You can check this at a shell prompt by:</li>
<br> <br>
<br> <br>
<br> <br>
<br>
</body> </body>
</html> </html>

93
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View File

@ -84,18 +84,18 @@
<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 GNU href="http://www.gnu.org/licenses/gpl.html">Version 2 of the
General Public License</a> as published by the Free Software GNU 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 in
the hope that it will be useful, but the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even WITHOUT ANY WARRANTY; without even the
the implied warranty of MERCHANTABILITY implied warranty of MERCHANTABILITY or
or FITNESS FOR A PARTICULAR PURPOSE. See the FITNESS FOR A PARTICULAR PURPOSE. See the GNU
GNU General Public License for more details.<br> General Public License for more details.<br>
<br> <br>
@ -117,7 +117,8 @@ Inc., 675 Mass Ave, Cambridge, MA 02139, USA</p>
<h2>Getting Started with Shorewall</h2> <h2>Getting Started with Shorewall</h2>
New to Shorewall? Start by selecting the <a New to Shorewall? Start by selecting the
<a
href="file:///vfat/Shorewall-docs/shorewall_quickstart_guide.htm">QuickStart href="file:///vfat/Shorewall-docs/shorewall_quickstart_guide.htm">QuickStart
Guide</a> that most closely match your environment and follow Guide</a> that most closely match your environment and follow
the step by step instructions.<br> the step by step instructions.<br>
@ -127,8 +128,8 @@ the step by step instructions.<br>
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>
@ -138,17 +139,23 @@ Index</a> is a good place to start as is the Quick Search to your right.
<h2><b>News</b></h2> <h2><b>News</b></h2>
<p><b>7/7/2003 - Shorewall-1.4.6 Beta 2</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
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>
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 start <li>A problem seen on RH7.3 systems where Shorewall encountered
errors when started using the "service" mechanism has been worked around.<br> start errors when started using the "service" mechanism has been worked
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 a
@ -159,7 +166,13 @@ a single DNAT rule with multiple "--to-destination" clauses.<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 a "-"
were mis-handled when they appeared in the DEST column of a rule.<br> were mis-handled when they appeared in the DEST column of a rule.<br>
<br>
</li> </li>
<li value="4">A number of problems with rule parsing have been corrected.
Corrections involve the handling of "z1!z2" in the SOURCE column as well
as lists in the ORIGINAL DESTINATION column.<br>
</li>
</ol> </ol>
<p><b>Migration Issues:</b><br> <p><b>Migration Issues:</b><br>
@ -181,6 +194,7 @@ entries of the following format:<br>
removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically removed from /etc/shorewall/shorewall.conf. These capabilities are now automatically
detected by Shorewall (see below).<br> detected by Shorewall (see below).<br>
</li> </li>
</ol> </ol>
<p><b>New Features:</b><br> <p><b>New Features:</b><br>
@ -201,19 +215,19 @@ for packets arriving on the associated interface.<br>
first one on an interface.<br> first one on an interface.<br>
<br> <br>
</li> </li>
<li>DNAT[-] rules may now be used to load balance (round-robin) over <li>DNAT[-] rules may now be used to load balance (round-robin)
a set of servers. Servers may be specified in a range of addresses given over a set of servers. Servers may be specified in a range of addresses
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>
<br> <br>
    DNAT net loc:192.168.10.2-192.168.10.5 tcp 80<br>     DNAT net loc:192.168.10.2-192.168.10.5 tcp 80<br>
<br> <br>
</li> </li>
<li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration options <li>The NAT_ENABLED, MANGLE_ENABLED and MULTIPORT configuration
have been removed and have been replaced by code that detects whether these options have been removed and have been replaced by code that detects whether
capabilities are present in the current kernel. The output of the start, these capabilities are present in the current kernel. The output of the
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>
   NAT: Available<br>    NAT: Available<br>
@ -224,10 +238,10 @@ restart and check commands have been enhanced to report the outcome:<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 and
allows for rules which match against elements in netfilter's connection allows for rules which match against elements in netfilter's connection tracking
tracking table. Shorewall automatically detects the availability of this table. Shorewall automatically detects the availability of this extension
extension and reports its availability in the output of the start, restart and reports its availability in the output of the start, restart and check
and check commands.<br> 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>
@ -236,12 +250,13 @@ and check commands.<br>
   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 changed If this extension is available, the ruleset generated by Shorewall is
in the following ways:</li> 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 chains in the mangle table but will rather do all 'norfc1918' filtering in
in the filter table (rfc1918 chain).</li> 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 rules;
one in the nat table and one in the filter table. If the Connection Tracking one in the nat table and one in the filter table. If the Connection Tracking
Match Extension is available, the rule in the filter table is extended to Match Extension is available, the rule in the filter table is extended to
@ -249,6 +264,7 @@ check that the original destination address was the same as specified (or
defaulted to) in the DNAT rule.<br> defaulted to) in the DNAT rule.<br>
<br> <br>
</li> </li>
</ul> </ul>
<li>The shell used to interpret the firewall script (/usr/share/shorewall/firewall) <li>The shell used to interpret the firewall script (/usr/share/shorewall/firewall)
may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf.<br> may now be specified using the SHOREWALL_SHELL parameter in shorewall.conf.<br>
@ -316,6 +332,7 @@ then the range may not span 128.0.0.0.<br>
Example:<br> Example:<br>
<br> <br>
    foo    eth1:192.168.1.0/24,192.168.2.0/24</li>     foo    eth1:192.168.1.0/24,192.168.2.0/24</li>
</ol> </ol>
<b> </b> <b> </b>
<ol> <ol>
@ -342,18 +359,18 @@ file; previously, INCLUDE in that file was ignored.</li>
</p> </p>
<ol> <ol>
<li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-] rule <li>The ORIGINAL DEST column in a DNAT[-] or REDIRECT[-]
may now contain a list of addresses. If the list begins with "!' then rule may now contain a list of addresses. If the list begins with "!'
the rule will take effect only if the original destination address in then the rule will take effect only if the original destination address
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 kernel The firewall at shorewall.net has been upgraded to the 2.4.21
and iptables 1.2.8 (using the "official" RPM from netfilter.org). No kernel and iptables 1.2.8 (using the "official" RPM from netfilter.org).
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>
@ -362,6 +379,7 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
<p>Thanks to Francesca Smith, the samples have been updated to Shorewall <p>Thanks to Francesca Smith, the samples have been updated to Shorewall
version 1.4.4.</p> version 1.4.4.</p>
<p><b></b></p> <p><b></b></p>
<ol> <ol>
@ -421,8 +439,8 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
have a LEAF (router/firewall/gateway 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 features
Shorewall-1.4.2 and Kernel-2.4.20. You Shorewall-1.4.2 and Kernel-2.4.20.
can find their work at: <a You can find their work at: <a
href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo</a></p> href="http://leaf.sourceforge.net/devel/jnilo"> http://leaf.sourceforge.net/devel/jnilo</a></p>
<b>Congratulations to Jacques <b>Congratulations to Jacques
@ -524,6 +542,7 @@ version is 1.4.4b plus the accumulated changes for 1.4.5.
<p align="center"><a href="http://www.starlight.org"> <img <p align="center"><a href="http://www.starlight.org"> <img
border="4" src="images/newlog.gif" width="57" height="100" align="left" border="4" src="images/newlog.gif" width="57" height="100" align="left"
hspace="10"> hspace="10">
@ -551,7 +570,7 @@ and find it useful, please consider making a donation
</table> </table>
<p><font size="2">Updated 7/7/2003 - <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>
</body> </body>

89
Shorewall-docs/support.htm
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@ -29,9 +29,9 @@
<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 try There are a number of sources of Shorewall information. Please
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>
@ -49,9 +49,9 @@ has solutions to more than 20 common problems.
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> The <li>
<a href="http://www.shorewall.net/errata.htm"> Errata</a> has links The <a href="http://www.shorewall.net/errata.htm"> Errata</a>
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:
@ -96,8 +96,8 @@ locate documents and posts about similar problems:
<option value="[http://lists.shorewall.net/pipermail/.*]">No</option> <option value="[http://lists.shorewall.net/pipermail/.*]">No</option>
</select> </select>
</font><br> </font><br>
Search: <input type="text" size="30" name="words" Search: <input type="text" size="30"
value=""> <input type="submit" value="Search"><br> name="words" value=""> <input type="submit" value="Search"><br>
</form> </form>
</blockquote> </blockquote>
@ -114,21 +114,21 @@ locate documents and posts about similar problems:
is lacking.<br> is lacking.<br>
<br> <br>
</li> </li>
<li>Please keep in mind that you're <li>Please keep in mind that
asking for <strong>free</strong> technical support. you're asking for <strong>free</strong> technical
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 practices in writing and formatting your e-mail. Provide details that
that we need if you expect good answers. <em>Exact quoting </em> we need if you expect good answers. <em>Exact quoting </em> of
of error messages, log entries, command output, and other output is error messages, log entries, command output, and other output is better
better than a paraphrase or summary.<br> than a paraphrase or summary.<br>
<br> <br>
</li> </li>
<li> <li>
Please don't describe your environment and then ask Please don't describe your environment and then
us to send you custom configuration files. We're ask us to send you custom configuration files.
here to answer your questions but we can't do We're here to answer your questions but we can't
your job for you.<br> do your job for you.<br>
<br> <br>
</li> </li>
<li>When reporting a problem, <li>When reporting a problem,
@ -185,10 +185,10 @@ better than a paraphrase or summary.<br>
<ul> <ul>
<ul> <ul>
<li><font color="#ff0000"><u><i><big><b>THIS IS IMPORTANT!<br> <li><big><font color="#ff0000"><u><i><big><b>THIS IS
<br> IMPORTANT!</b></big></i></u></font><big><big><big> </big>If your problem
</b></big></i></u></font>If your problem is that some type of connection is that some type of connection to/from or through your firewall isn't working
to/from or through your firewall isn't working then please:<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>
<br> <br>
@ -197,7 +197,8 @@ to/from or through your firewall isn't working then please:<br>
3.<b><font color="#009900"> /sbin/shorewall 3.<b><font color="#009900"> /sbin/shorewall
status &gt; /tmp/status.txt</font></b><br> status &gt; /tmp/status.txt</font></b><br>
<br> <br>
4. Post the /tmp/status.txt file as an attachment.<br> 4. Post the /tmp/status.txt file as an attachment
(you may compress it if you like).<br>
<br> <br>
</li> </li>
<li>the exact wording of any <code <li>the exact wording of any <code
@ -226,8 +227,8 @@ in the SMTP headers of your post).<br>
<li>Do you see any "Shorewall" messages <li>Do you see any "Shorewall" messages
("<b><font color="#009900">/sbin/shorewall show log</font></b>") ("<b><font color="#009900">/sbin/shorewall show log</font></b>")
when you exercise the function that is giving you problems? when you exercise the function that is giving you problems?
If so, include the message(s) in your post along with a copy of your If so, include the message(s) in your post along with a copy of
/etc/shorewall/interfaces file.<br> your /etc/shorewall/interfaces file.<br>
<br> <br>
</li> </li>
<li>Please include any of the Shorewall configuration <li>Please include any of the Shorewall configuration
@ -259,28 +260,28 @@ etc. to the Mailing List -- your post will be rejected.</b><
<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 <blockquote> A growing number of MTAs serving list subscribers are rejecting
rejecting all HTML traffic. At least one MTA has gone so far as to all HTML traffic. At least one MTA has gone so far as to blacklist
blacklist shorewall.net "for continuous abuse" because it has been shorewall.net "for continuous abuse" because it has been my policy
my policy to allow HTML in list posts!!<br> to allow HTML in list posts!!<br>
<br> <br>
I think that blocking all HTML I think that blocking all
is a Draconian way to control spam and that the ultimate HTML is a Draconian way to control spam and that the
losers here are not the spammers but the list subscribers ultimate 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 to get a <i>(expletive deleted)</i> life instead of trying to rid
rid the planet of HTML based e-mail". Nevertheless, to allow the planet of HTML based e-mail". Nevertheless, to allow subscribers
subscribers to receive list posts as must as possible, I have now to receive list posts as must as possible, I have now configured
configured the list server at shorewall.net to strip all HTML from the list server at shorewall.net to strip all HTML from outgoing
outgoing posts.<br> 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 lists
unless/until the postmaster notices that your posts are being rejected. To unless/until the postmaster notices that your posts are being rejected.
avoid this problem, you should configure your MTA to forward posts to shorewall.net To avoid this problem, you should configure your MTA to forward posts to
through an MTA that <u>does</u> have a valid PTR record (such as the one shorewall.net through an MTA that <u>does</u> have a valid PTR record (such
at your ISP). </b></font></big><br> as the one at your ISP). </b></font></big><br>
</blockquote> </blockquote>
<h2>Where to Send your Problem Report or to Ask for Help</h2> <h2>Where to Send your Problem Report or to Ask for Help</h2>
@ -312,12 +313,10 @@ at your ISP). </b></font></big><br>
href="http://lists.shorewall.net">http://lists.shorewall.net</a><br> href="http://lists.shorewall.net">http://lists.shorewall.net</a><br>
</p> </p>
<p align="left"><font size="2">Last Updated 7/6/2003 - Tom Eastep</font></p> <p align="left"><font size="2">Last Updated 7/9/2003 - 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> © <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>
<br>
</body> </body>
</html> </html>

2
Shorewall/fallback.sh
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@ -28,7 +28,7 @@
# shown below. Simply run this script to revert to your prior version of # shown below. Simply run this script to revert to your prior version of
# Shoreline Firewall. # Shoreline Firewall.
VERSION=1.4.6Beta2 VERSION=1.4.6RC1
usage() # $1 = exit status usage() # $1 = exit status
{ {

2
Shorewall/install.sh
View File

@ -54,7 +54,7 @@
# /etc/rc.d/rc.local file is modified to start the firewall. # /etc/rc.d/rc.local file is modified to start the firewall.
# #
VERSION=1.4.6Beta2 VERSION=1.4.6RC1
usage() # $1 = exit status usage() # $1 = exit status
{ {

4
Shorewall/shorewall.spec
View File

@ -1,6 +1,6 @@
%define name shorewall %define name shorewall
%define version 1.4.6 %define version 1.4.6
%define release 0Beta2 %define release 0RC1
%define prefix /usr %define prefix /usr
Summary: Shoreline Firewall is an iptables-based firewall for Linux systems. Summary: Shoreline Firewall is an iptables-based firewall for Linux systems.
@ -105,6 +105,8 @@ fi
%doc COPYING INSTALL changelog.txt releasenotes.txt tunnel %doc COPYING INSTALL changelog.txt releasenotes.txt tunnel
%changelog %changelog
* Mon Jul 14 2003 Tom Eastep <tom@shorewall.net>
- Changed version to 1.4.6-0RC1
* Mon Jul 07 2003 Tom Eastep <tom@shorewall.net> * Mon Jul 07 2003 Tom Eastep <tom@shorewall.net>
- Changed version to 1.4.6-0Beta2 - Changed version to 1.4.6-0Beta2
* Fri Jul 04 2003 Tom Eastep <tom@shorewall.net> * Fri Jul 04 2003 Tom Eastep <tom@shorewall.net>

2
Shorewall/uninstall.sh
View File

@ -26,7 +26,7 @@
# You may only use this script to uninstall the version # You may only use this script to uninstall the version
# shown below. Simply run this script to remove Seattle Firewall # shown below. Simply run this script to remove Seattle Firewall
VERSION=1.4.6Beta2 VERSION=1.4.6RC1
usage() # $1 = exit status usage() # $1 = exit status
{ {