2002-09-30 20:11:25 +02:00
|
|
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
2002-08-07 16:28:04 +02:00
|
|
|
|
<html>
|
|
|
|
|
|
<head>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<meta http-equiv="Content-Language" content="en-us">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<meta name="ProgId" content="FrontPage.Editor.Document">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<meta http-equiv="Content-Type"
|
|
|
|
|
|
content="text/html; charset=windows-1252">
|
|
|
|
|
|
<title>Standalone Firewall</title>
|
2002-08-07 16:28:04 +02:00
|
|
|
|
</head>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<body>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="0" cellpadding="0" cellspacing="0"
|
|
|
|
|
|
style="border-collapse: collapse;" bordercolor="#111111" width="100%"
|
2003-07-22 00:06:18 +02:00
|
|
|
|
id="AutoNumber6" bgcolor="#3366ff" height="90">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td width="100%">
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<h1 align="center"><font color="#ffffff">Standalone Firewall</font></h1>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-08-22 23:33:54 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p align="left">Setting up Shorewall on a standalone Linux system is very
|
|
|
|
|
|
easy if you understand the basics and follow the documentation.</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p>This guide doesn't attempt to acquaint you with all of the features of
|
|
|
|
|
|
Shorewall. It rather focuses on what is required to configure Shorewall
|
|
|
|
|
|
in one of its most common configurations:</p>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
<ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<li>Linux system</li>
|
|
|
|
|
|
<li>Single external IP address</li>
|
|
|
|
|
|
<li>Connection through Cable Modem, DSL, ISDN, Frame Relay,
|
|
|
|
|
|
dial-up...</li>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
</ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p>Shorewall requires that you have the iproute/iproute2 package installed
|
|
|
|
|
|
(on RedHat, the package is called <i>iproute</i>)<i>. </i>You can tell
|
|
|
|
|
|
if this package is installed by the presence of an <b>ip</b> program
|
|
|
|
|
|
on your firewall system. As root, you can use the 'which' command to
|
|
|
|
|
|
check for this program:</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<pre> [root@gateway root]# which ip<br> /sbin/ip<br> [root@gateway root]#</pre>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p>I recommend that you read through the guide first to familiarize yourself
|
|
|
|
|
|
with what's involved then go back through it again making your configuration
|
|
|
|
|
|
changes.<2E> Points at which configuration changes are recommended are
|
|
|
|
|
|
flagged with <img border="0" src="images/BD21298_.gif" width="13"
|
2003-05-18 20:38:34 +02:00
|
|
|
|
height="13">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
.</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p><img border="0" src="images/j0213519.gif" width="60" height="60">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD> If you edit your configuration files on a Windows system,
|
|
|
|
|
|
you must save them as Unix files if your editor supports that option
|
|
|
|
|
|
or you must run them through dos2unix before trying to use them. Similarly,
|
|
|
|
|
|
if you copy a configuration file from your Windows hard drive to a floppy
|
|
|
|
|
|
disk, you must run dos2unix against the copy before using it with Shorewall.</p>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
<ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<li><a href="http://www.simtel.net/pub/pd/51438.html">Windows
|
|
|
|
|
|
Version of dos2unix</a></li>
|
|
|
|
|
|
<li><a
|
|
|
|
|
|
href="http://www.megaloman.com/%7Ehany/software/hd2u/">Linux Version
|
|
|
|
|
|
of dos2unix</a></li>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
</ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
<h2 align="left">Shorewall Concepts</h2>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-12-28 16:38:03 +01:00
|
|
|
|
<p> <img border="0" src="images/BD21298_.gif" width="13" height="13"
|
|
|
|
|
|
alt="">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD> The configuration files for Shorewall are contained in the directory
|
|
|
|
|
|
/etc/shorewall -- for simple setups, you only need to deal with a few
|
|
|
|
|
|
of these as described in this guide. After you have <a
|
2003-02-08 21:48:47 +01:00
|
|
|
|
href="Install.htm">installed Shorewall</a>, <b>download the <a
|
2003-08-05 20:38:21 +02:00
|
|
|
|
href="http://www1.shorewall.net/pub/shorewall/Samples/">one-interface sample</a>,
|
|
|
|
|
|
un-tar it (tar -zxvf one-interface.tgz) and and copy the files to /etc/shorewall
|
|
|
|
|
|
(they will replace files with the same names that were placed in /etc/shorewall
|
|
|
|
|
|
during Shorewall installation)</b>.</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p>As each file is introduced, I suggest that you look through the actual
|
|
|
|
|
|
file on your system -- each file contains detailed configuration instructions
|
|
|
|
|
|
and default entries.</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p>Shorewall views the network where it is running as being composed of a
|
|
|
|
|
|
set of <i>zones.</i> In the one-interface sample configuration, only
|
|
|
|
|
|
one zone is defined:</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="0" style="border-collapse: collapse;" cellpadding="3"
|
|
|
|
|
|
cellspacing="0" id="AutoNumber2">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td><u><b>Name</b></u></td>
|
|
|
|
|
|
<td><u><b>Description</b></u></td>
|
|
|
|
|
|
</tr>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<tr>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<td><b>net</b></td>
|
|
|
|
|
|
<td><b>The Internet</b></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p>Shorewall zones are defined in <a href="Documentation.htm#Zones"> /etc/shorewall/zones</a>.</p>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p>Shorewall also recognizes the firewall system as its own zone - by default,
|
|
|
|
|
|
the firewall itself is known as <b>fw</b>.</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p>Rules about what traffic to allow and what traffic to deny are expressed
|
|
|
|
|
|
in terms of zones.</p>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
<ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<li>You express your default policy for connections from one
|
|
|
|
|
|
zone to another zone in the<a href="Documentation.htm#Policy"> /etc/shorewall/policy
|
|
|
|
|
|
</a>file.</li>
|
|
|
|
|
|
<li>You define exceptions to those default policies in the
|
|
|
|
|
|
<a href="Documentation.htm#Rules">/etc/shorewall/rules </a>file.</li>
|
|
|
|
|
|
|
2002-08-22 23:33:54 +02:00
|
|
|
|
</ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p>For each connection request entering the firewall, the request is first
|
|
|
|
|
|
checked against the /etc/shorewall/rules file. If no rule in that file
|
|
|
|
|
|
matches the connection request then the first policy in /etc/shorewall/policy
|
|
|
|
|
|
that matches the request is applied. If that policy is REJECT or DROP<4F>
|
|
|
|
|
|
the request is first checked against the rules in /etc/shorewall/common
|
|
|
|
|
|
(the samples provide that file for you).</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p>The /etc/shorewall/policy file included with the one-interface sample
|
|
|
|
|
|
has the following policies:</p>
|
|
|
|
|
|
|
|
|
|
|
|
<blockquote>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="1" cellpadding="2" style="border-collapse: collapse;"
|
|
|
|
|
|
id="AutoNumber3">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td><u><b>SOURCE ZONE</b></u></td>
|
|
|
|
|
|
<td><u><b>DESTINATION ZONE</b></u></td>
|
|
|
|
|
|
<td><u><b>POLICY</b></u></td>
|
|
|
|
|
|
<td><u><b>LOG LEVEL</b></u></td>
|
|
|
|
|
|
<td><u><b>LIMIT:BURST</b></u></td>
|
|
|
|
|
|
</tr>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<tr>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<td>fw</td>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>ACCEPT</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>all<br>
|
|
|
|
|
|
</td>
|
|
|
|
|
|
<td>DROP</td>
|
|
|
|
|
|
<td>info</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>all</td>
|
|
|
|
|
|
<td>all</td>
|
|
|
|
|
|
<td>REJECT</td>
|
|
|
|
|
|
<td>info</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</blockquote>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p>The above policy will:</p>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<ol>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<li>allow all connection requests from the firewall to the internet</li>
|
|
|
|
|
|
<li>drop (ignore) all connection requests from the internet
|
|
|
|
|
|
to your firewall</li>
|
|
|
|
|
|
<li>reject all other connection requests (Shorewall requires
|
2003-07-22 00:06:18 +02:00
|
|
|
|
this catchall policy).</li>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</ol>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p>At this point, edit your /etc/shorewall/policy and make any changes that
|
|
|
|
|
|
you wish.</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<h2 align="left">External Interface</h2>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p align="left">The firewall has a single network interface. Where Internet
|
|
|
|
|
|
connectivity is through a cable or DSL "Modem", the <i>External Interface</i>
|
|
|
|
|
|
will be the ethernet adapter (<b>eth0</b>) that is connected to that
|
|
|
|
|
|
"Modem"<22> <u>unless</u> you connect via <i><u>P</u>oint-to-<u>P</u>oint
|
|
|
|
|
|
<u>P</u>rotocol over <u>E</u>thernet</i> (PPPoE) or <i><u>P</u>oint-to-<u>P</u>oint
|
|
|
|
|
|
<u>T</u>unneling <u>P</u>rotocol </i>(PPTP) in which case the External
|
|
|
|
|
|
Interface will be a <b>ppp0</b>. If you connect via a regular modem, your
|
|
|
|
|
|
External Interface will also be <b>ppp0</b>. If you connect using ISDN,
|
|
|
|
|
|
your external interface will be<b> ippp0.</b></p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p align="left"><img border="0" src="images/BD21298_3.gif" width="13"
|
|
|
|
|
|
height="13">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD> The Shorewall one-interface sample configuration assumes that
|
|
|
|
|
|
the external interface is <b>eth0</b>. If your configuration is different,
|
|
|
|
|
|
you will have to modify the sample /etc/shorewall/interfaces file accordingly.
|
|
|
|
|
|
While you are there, you may wish to review the list of options that
|
|
|
|
|
|
are specified for the interface. Some hints:</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<li>
|
|
|
|
|
|
<p align="left">If your external interface is <b>ppp0</b> or <b>ippp0</b>,
|
|
|
|
|
|
you can replace the "detect" in the second column with "-". </p>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
<li>
|
|
|
|
|
|
<p align="left">If your external interface is <b>ppp0</b> or <b>ippp0</b>
|
|
|
|
|
|
or if you have a static IP address, you can remove "dhcp" from the
|
|
|
|
|
|
option list. </p>
|
|
|
|
|
|
</li>
|
|
|
|
|
|
|
2003-03-18 16:16:33 +01:00
|
|
|
|
</ul>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<h2 align="left">IP Addresses</h2>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left">RFC 1918 reserves several <i>Private </i>IP address ranges
|
|
|
|
|
|
for use in private networks:</p>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
2003-03-18 16:16:33 +01:00
|
|
|
|
<pre> 10.0.0.0 - 10.255.255.255<br> 172.16.0.0 - 172.31.255.255<br> 192.168.0.0 - 192.168.255.255</pre>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<p align="left">These addresses are sometimes referred to as <i>non-routable</i>
|
|
|
|
|
|
because the Internet backbone routers will not forward a packet whose
|
|
|
|
|
|
destination address is reserved by RFC 1918. In some cases though,
|
|
|
|
|
|
ISPs are assigning these addresses then using <i>Network Address Translation
|
|
|
|
|
|
</i>to rewrite packet headers when forwarding to/from the internet.</p>
|
|
|
|
|
|
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p align="left"><img border="0" src="images/BD21298_.gif" align="left"
|
|
|
|
|
|
width="13" height="13">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD><EFBFBD> Before starting Shorewall, you should look at the IP address
|
|
|
|
|
|
of your external interface and if it is one of the above ranges, you
|
|
|
|
|
|
should remove the 'norfc1918' option from the entry in /etc/shorewall/interfaces.</p>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<h2 align="left">Enabling other Connections</h2>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left">If you wish to enable connections from the internet to your
|
|
|
|
|
|
firewall, the general format is:</p>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
</div>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<blockquote>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="1" cellpadding="2" style="border-collapse: collapse;"
|
|
|
|
|
|
id="AutoNumber4">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<tr>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<td><u><b>ACTION</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE</b></u></td>
|
|
|
|
|
|
<td><u><b>DESTINATION</b></u></td>
|
|
|
|
|
|
<td><u><b>PROTOCOL</b></u></td>
|
|
|
|
|
|
<td><u><b>PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>ORIGINAL ADDRESS</b></u></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>ACCEPT</td>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>fw</td>
|
|
|
|
|
|
<td><i><protocol></i></td>
|
|
|
|
|
|
<td><i><port></i></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</blockquote>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left">Example - You want to run a Web Server and a POP3 Server
|
|
|
|
|
|
on your firewall system:</p>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
</div>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<blockquote>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="1" cellpadding="2" style="border-collapse: collapse;"
|
|
|
|
|
|
id="AutoNumber5">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<tr>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<td><u><b>ACTION</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE</b></u></td>
|
|
|
|
|
|
<td><u><b>DESTINATION</b></u></td>
|
|
|
|
|
|
<td><u><b>PROTOCOL</b></u></td>
|
|
|
|
|
|
<td><u><b>PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>ORIGINAL ADDRESS</b></u></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>ACCEPT</td>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>fw</td>
|
|
|
|
|
|
<td>tcp</td>
|
|
|
|
|
|
<td>80</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>ACCEPT</td>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>fw</td>
|
|
|
|
|
|
<td>tcp</td>
|
|
|
|
|
|
<td>110</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</blockquote>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left">If you don't know what port and protocol a particular application
|
2003-07-22 00:06:18 +02:00
|
|
|
|
uses, see <a href="ports.htm">here</a>.</p>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left"><b>Important: </b>I don't recommend enabling telnet to/from
|
|
|
|
|
|
the internet because it uses clear text (even for login!). If you
|
|
|
|
|
|
want shell access to your firewall from the internet, use SSH:</p>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<blockquote>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<table border="1" cellpadding="2" style="border-collapse: collapse;"
|
|
|
|
|
|
id="AutoNumber4">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<tbody>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<tr>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<td><u><b>ACTION</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE</b></u></td>
|
|
|
|
|
|
<td><u><b>DESTINATION</b></u></td>
|
|
|
|
|
|
<td><u><b>PROTOCOL</b></u></td>
|
|
|
|
|
|
<td><u><b>PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>SOURCE PORT</b></u></td>
|
|
|
|
|
|
<td><u><b>ORIGINAL ADDRESS</b></u></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
<tr>
|
|
|
|
|
|
<td>ACCEPT</td>
|
|
|
|
|
|
<td>net</td>
|
|
|
|
|
|
<td>fw</td>
|
|
|
|
|
|
<td>tcp</td>
|
|
|
|
|
|
<td>22</td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
<td><EFBFBD></td>
|
|
|
|
|
|
</tr>
|
|
|
|
|
|
|
|
|
|
|
|
</tbody>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</table>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</blockquote>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p align="left"><img border="0" src="images/BD21298_3.gif" width="13"
|
|
|
|
|
|
height="13">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD> At this point, edit /etc/shorewall/rules to add other connections
|
|
|
|
|
|
as desired.</p>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
</div>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<h2 align="left">Starting and Stopping Your Firewall</h2>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<p align="left"> <img border="0" src="images/BD21298_2.gif"
|
|
|
|
|
|
width="13" height="13" alt="Arrow">
|
2003-08-05 20:38:21 +02:00
|
|
|
|
<20><><EFBFBD> The <a href="Install.htm">installation procedure </a> configures
|
|
|
|
|
|
your system to start Shorewall at system boot but beginning with Shorewall
|
|
|
|
|
|
version 1.3.9 startup is disabled so that your system won't try to start
|
|
|
|
|
|
Shorewall before configuration is complete. Once you have completed configuration
|
|
|
|
|
|
of your firewall, you can enable Shorewall startup by removing the file
|
2003-07-22 00:06:18 +02:00
|
|
|
|
/etc/shorewall/startup_disabled.<br>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
|
|
<p align="left"><font color="#ff0000"><b>IMPORTANT</b>: Users of the .deb
|
|
|
|
|
|
package must edit /etc/default/shorewall and set 'startup=1'.</font><br>
|
|
|
|
|
|
</p>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left">The firewall is started using the "shorewall start" command
|
|
|
|
|
|
and stopped using "shorewall stop". When the firewall is stopped,
|
|
|
|
|
|
routing is enabled on those hosts that have an entry in <a
|
|
|
|
|
|
href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>. A
|
|
|
|
|
|
running firewall may be restarted using the "shorewall restart" command.
|
|
|
|
|
|
If you want to totally remove any trace of Shorewall from your Netfilter
|
|
|
|
|
|
configuration, use "shorewall clear".</p>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div align="left">
|
|
|
|
|
|
<p align="left"><b>WARNING: </b>If you are connected to your firewall from
|
|
|
|
|
|
the internet, do not issue a "shorewall stop" command unless you
|
|
|
|
|
|
have added an entry for the IP address that you are connected from
|
|
|
|
|
|
to <a href="Documentation.htm#Routestopped">/etc/shorewall/routestopped</a>.
|
|
|
|
|
|
Also, I don't recommend using "shorewall restart"; it is better to create
|
|
|
|
|
|
an <i><a href="configuration_file_basics.htm#Configs">alternate configuration</a></i>
|
|
|
|
|
|
and test it using the <a
|
2003-03-18 16:16:33 +01:00
|
|
|
|
href="starting_and_stopping_shorewall.htm">"shorewall try" command</a>.</p>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
</div>
|
|
|
|
|
|
|
2003-03-18 16:16:33 +01:00
|
|
|
|
<p align="left"><font size="2">Last updated 2/21/2003 - <a
|
2002-09-30 20:11:25 +02:00
|
|
|
|
href="support.htm">Tom Eastep</a></font></p>
|
2003-08-05 20:38:21 +02:00
|
|
|
|
|
|
|
|
|
|
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002, 2003
|
|
|
|
|
|
Thomas M. Eastep</font></a></p>
|
|
|
|
|
|
<br>
|
|
|
|
|
|
<br>
|
2003-07-22 00:06:18 +02:00
|
|
|
|
<br>
|
2003-05-18 20:38:34 +02:00
|
|
|
|
<br>
|
2003-04-13 17:28:32 +02:00
|
|
|
|
<br>
|
2003-03-18 16:16:33 +01:00
|
|
|
|
<br>
|
2003-02-08 21:48:47 +01:00
|
|
|
|
<br>
|
2002-12-28 16:38:03 +01:00
|
|
|
|
<br>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<br>
|
2002-11-24 21:12:22 +01:00
|
|
|
|
<br>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
<br>
|
2002-08-22 23:33:54 +02:00
|
|
|
|
</body>
|
2002-09-30 20:11:25 +02:00
|
|
|
|
</html>
|
