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<title>Shoreline Firewall (Shorewall)</title>
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<body dir="ltr" lang="en-US">
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<h1>Shoreline Firewall (Shorewall)</h1>
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<p>Copyright © 2001-2008 Thomas M. Eastep</p>
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<p>Permission is granted to copy, distribute and/or modify this
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document
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under the terms of the GNU Free Documentation License, Version 1.2 or
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any
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later version published by the Free Software Foundation; with no
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Invariant
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Sections, with no Front-Cover, and with no Back-Cover Texts. A copy of
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the
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license is included in the section entitled <span
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style="text-decoration: underline;">"</span><a href="GnuCopyright.htm"
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target="_self">GNU Free Documentation License</a>".</p>
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<p>2008-04-16</p>
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<hr style="width: 100%; height: 2px;">
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<h2 style="text-align: center;"><img style="width: 70px; height: 102px;"
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alt="Linuxfest Northwest Logo" src="images/totem350a.png" align="right"></h2>
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<h2 style="text-align: center;"><a target="_top"
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href="http://www.linuxfestnw.org"><span style="font-weight: bold;"><img
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alt="" src="images/totem350a.png"
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style="border: 0px solid ; width: 70px; height: 102px;" align="left"></span>Linuxfest
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Northwest 2008</a><br>
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</h2>
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<span style="font-weight: bold;"></span>
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<h2 style="text-align: center;">
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April 26-27, Bellingham, Washington<br>
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</h2>
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<h2 style="text-align: center;"><small>Hope to see you all there -- Tom</small></h2>
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<br>
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<hr style="width: 100%; height: 2px;">
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<h2>Table of Contents</h2>
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<p style="margin-bottom: 0in; margin-left: 0.42in;"><a href="#Intro">Introduction
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to Shorewall</a> </p>
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<p style="margin-bottom: 0in; margin-left: 0.83in;"><a href="#Glossary">Glossary</a><br>
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<a href="#WhatIs">What is Shorewall?</a><br>
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<a href="#Releases">Current Shorewall Releases</a><br>
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<a href="#GettingStarted">Getting Started with Shorewall</a><br>
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<a href="#Info">Looking for Information?</a><br>
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<a href="#License">License</a></p>
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<p style="margin-left: 0.42in;"><a href="#Notice"><strong>Important
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Notice to
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users of Shorewall Multi-ISP Feature</strong></a> -- <strong>UPDATED 7
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November 2007</strong></p>
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<p style="margin-left: 0.42in;"><a href="#Notice1"><strong>Important
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Notice
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to users of BRIDGING=Yes</strong></a> </p>
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<p style="margin-left: 0.42in;"><a href="#Leaf">Leaf</a><br>
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<a href="#OpenWRT">OpenWRT</a><br>
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<a href="#Donations">Donations</a></p>
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<h3><a name="Glossary"></a>Glossary</h3>
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<ul>
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<li>
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<p style="margin-bottom: 0in;"><a href="http://www.netfilter.org/"
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target="_top">Netfilter</a> - the packet filter facility built into
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the 2.4 and later Linux kernels.</p>
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</li>
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<li>
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<p style="margin-bottom: 0in;">ipchains - the packet filter
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facility built into the 2.2 Linux kernels. Also the name of the utility
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program used to configure and control that facility. Netfilter can be
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used in ipchains compatibility mode.</p>
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</li>
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<li>
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<p>iptables - the utility program used to configure and control
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Netfilter. The term 'iptables' is often used to refer to the
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combination of iptables+Netfilter (with Netfilter not in ipchains
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compatibility mode).</p>
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</li>
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</ul>
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<h3><a name="WhatIs"></a>What is Shorewall?</h3>
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<p style="margin-left: 0.42in;">The Shoreline Firewall, more commonly
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known
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as "Shorewall", is a high-level tool for configuring Netfilter. You
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describe
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your firewall/gateway requirements using entries in a set of
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configuration
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files. Shorewall reads those configuration files and with the help of
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the
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iptables utility, Shorewall configures Netfilter to match your
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requirements.
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Shorewall can be used on a dedicated firewall system, a multi-function
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gateway/router/server or on a standalone GNU/Linux system. Shorewall
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does not
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use Netfilter's ipchains compatibility mode; as a consequence,
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Shorewall can
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take advantage of Netfilter's connection state tracking capabilities to
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create a stateful firewall.<br>
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<br>
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Shorewall is <u>not</u> a daemon. Once Shorewall has configured
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Netfilter,
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it's job is complete and there is no Shorewall code left running in the
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system. The <a href="starting_and_stopping_shorewall.htm">/sbin/shorewall
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program can be used at any time to monitor the Netfilter firewall</a>.</p>
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<p style="margin-left: 0.42in;">Shorewall is not the easiest to use of
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the
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available iptables configuration tools but I believe that it is the
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most
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flexible and powerful. So if you are looking for a simple
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point-and-click
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set-and-forget Linux firewall solution that requires a minimum of
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networking
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knowledge, I would encourage you to check out the following
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alternatives:</p>
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<ul>
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<li>
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<p style="margin-bottom: 0in;"><a href="http://www.m0n0.ch/wall">m0n0wall</a>
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(FreeBSD Based) </p>
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</li>
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<li>
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<p><a href="http://www.fs-security.com/">Firestarter<br>
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</a></p>
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</li>
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</ul>
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<p style="margin-left: 0.42in;">On the other hand, if you are looking
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for a
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Linux firewall solution that can handle complex and fast changing
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network
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environments then Shorewall is a logical choice.</p>
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<p style="margin-left: 0.42in;">To see some of the many things that you
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can
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do with Shorewall, see the <a href="shorewall_features.htm">Shorewall
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Features page</a>.<br>
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</p>
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<h3><a name="Releases"></a>Current Shorewall Releases</h3>
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<p style="margin-left: 40px;">The <span style="font-weight: bold;">current
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Stable Release</span> version is 4.0.10<br>
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</p>
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<ul style="margin-left: 40px;">
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.10/releasenotes.txt">release
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notes</a> <br>
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</li>
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.10/known_problems.txt">known
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problems</a> and <a
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href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.10/errata/">updates</a>.
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<p>Read more about the <a href="Shorewall-4.html">Release here</a>.<br>
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</p>
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</li>
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</ul>
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<div style="margin-left: 40px;">
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The <span style="font-weight: bold;">previous Stable Release</span>
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version
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is 3.4.8<br>
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<ul>
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.8/releasenotes.txt">release
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notes</a> <br>
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</li>
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.8/known_problems.txt">known
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problems</a> and <a
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href="http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.8/errata/">updates</a>.</li>
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</ul>
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The <span style="font-weight: bold;">current Development Release</span>
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is
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4.1.7.
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<ul>
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/development/4.1/shorewall-4.1.7/releasenotes.txt">release
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notes</a> </li>
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<li>Here are the <a
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href="http://www1.shorewall.net/pub/shorewall/development/4.1/shorewall-4.1.7/known_problems.txt">known
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problems</a> and <a
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href="http://www1.shorewall.net/pub/shorewall/development/4.1/shorewall-4.1.7/errata/">updates</a>.</li>
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</ul>
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</div>
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<div style="margin-left: 40px;">
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<p>Get them from the <a href="download.htm">download sites</a></p>
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</div>
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<h3><a name="GettingStarted"></a>Getting Started with Shorewall</h3>
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<p style="margin-left: 0.42in;">New to Shorewall? Download the current
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Stable
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version (see above) then select the <a
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href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that most
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closely
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matches your environment and follow the step by step instructions.</p>
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<h3><a name="Info"></a>Looking for Information?</h3>
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<p style="margin-left: 0.42in;">The <a href="Documentation.html">Documentation
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Index</a> is a good place to start as
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is the Site Search in the frame above.</p>
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<h3><a name="License"></a>License</h3>
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<p style="margin-left: 0.42in;">This program is free software; you can
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redistribute it and/or modify it under the terms of <a
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href="http://www.gnu.org/licenses/gpl.html">Version 2 of the GNU
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General
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Public License</a> as published by the Free Software Foundation.</p>
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<p style="margin-left: 0.42in;">This program is distributed in the hope
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that
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it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU
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General Public License for more detail.</p>
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<p style="margin-left: 0.42in;">You should have received a copy of the
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GNU
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General Public License along with this program; if not, write to the
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Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.</p>
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<p style="margin-left: 0.42in;">Permission is granted to copy,
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distribute
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and/or modify this document under the terms of the GNU Free
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Documentation
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License, Version 1.2 or any later version published by the Free
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Software
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Foundation; with no Invariant Sections, with no Front-Cover, and with
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no
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Back-Cover Texts. A copy of the license is included in the section
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entitled
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"GNU Free Documentation License".</p>
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<hr>
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<h2><a name="Notice">Important Notice to Users of Shorewall's Multi-ISP
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Feature</a></h2>
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2008-01-25 23:06:47 +01:00
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<p>A bug in Shorewall versions 3.2.0-3.2.10, 3.4.0-3.4.6 and
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Shorewall-shell
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4.0.0-4.0.2 prevents proper handling of PREROUTING marks when
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HIGH_ROUTE_MARKS=No and the <strong>track</strong> option is
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specified.
|
2007-08-22 20:45:12 +02:00
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Patches are available to correct this problem:</p>
|
2007-10-03 04:34:25 +02:00
|
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<p>Shorewall version 3.2.0-3.2.10, 3.4.0-3.4.3: <a
|
2007-12-29 17:31:49 +01:00
|
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|
href="http://www1.shorewall.net/pub/shorewall/3.2/shorewall-3.2.10/errata/patches/Shorewall/patch-3.2.10-2.diff">http://www1.shorewall.net/pub/shorewall/3.2/shorewall-3.2.10/errata/patches/Shorewall/patch-3.2.10-2.diff</a></p>
|
2007-10-16 20:03:20 +02:00
|
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|
<p>Shorewall version 3.4.4-3.4.6: <a
|
2007-12-29 17:31:49 +01:00
|
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|
href="http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.6/errata/patches/Shorewall/patch-3.4.6-1.diff">http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.66/errata/patches/Shorewall/patch-3.4.6-1.diff</a></p>
|
2007-10-03 04:34:25 +02:00
|
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<p>Shorewall-shell version 4.0.0-4.0.2: <a
|
2007-12-29 17:31:49 +01:00
|
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|
href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.2/errata/patches/Shorewall-shell/patch-shell-4.0.2-2.diff">http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.2/errata/patches/Shorewall-shell/patch-shell-4.0.2-2.diff</a></p>
|
2008-01-25 23:06:47 +01:00
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<p>Note that a patch may succeed with an offset when applied to a
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release
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other than the one for which it was specifically prepared. For example,
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when
|
2007-08-22 20:45:12 +02:00
|
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the patch for 3.2.0-3.2.10, 3.4.0-3.4.3 (which was prepared for release
|
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3.2.10) is applied to release 3.4.3, the following is the result:</p>
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<pre>root@wookie:~# <strong>cd /usr/share/shorewall</strong>
|
2008-01-25 23:06:47 +01:00
|
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|
root@wookie/usr/share/shorewall#: <strong>patch < ~/shorewall/tags/3.2.10/Shorewall.updated/patch-3.2.10-2.diff</strong> <br>patching file compiler<br>Hunk #1 succeeded at 958 (offset -1669 lines).<br>root@wookie:/usr/share/shorewall#</pre>
|
2007-11-16 00:24:54 +01:00
|
|
|
<h3>Update -- 7 November 2007</h3>
|
2007-11-07 18:38:39 +01:00
|
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|
<p>A second bug in Shorewall versions 3.2.0-3.2.11, 3.4.0-3.4.7 and
|
2008-01-25 23:06:47 +01:00
|
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4.0.0-4.0.5 can cause improper handing of PREROUTING and OUTPUT marks
|
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when
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HIGH_ROUTE_MARKS=Yes. Patches are also available to correct this
|
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problem:</p>
|
2007-12-06 01:40:32 +01:00
|
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|
<p>Shorewall version 3.2.3-3.2.11: <a
|
2007-12-29 17:31:49 +01:00
|
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|
href="http://www1.shorewall.net/pub/shorewall/3.2/shorewall-3.2.11/errata/patches/Shorewall/patch-3.2.11-1.diff">http://www1.shorewall.net/pub/shorewall/3.2/shorewall-3.2.11/errata/patches/Shorewall/patch-3.2.11-1.diff</a></p>
|
2007-11-07 18:38:39 +01:00
|
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|
<p>Shorewall version 3.4.0-3.4.7: <a
|
2007-12-29 17:31:49 +01:00
|
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|
href="http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.7/errata/patches/Shorewall/patch-3.4.7-1.diff">http://www1.shorewall.net/pub/shorewall/3.4/shorewall-3.4.7/errata/patches/Shorewall/patch-3.4.7-1.diff</a></p>
|
2007-11-07 18:38:39 +01:00
|
|
|
<p>Shorewall version 4.0.0-4.0.5: <a
|
2008-01-25 23:06:47 +01:00
|
|
|
href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.5/errata/patches/Shorewall-shell/patch-shell-4.0.5-1.diff">http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.5/errata/patches/Shorewall-shell/patch-shell-4.0.5-1.diff</a>
|
2007-11-07 18:38:39 +01:00
|
|
|
and <a
|
2007-12-29 17:31:49 +01:00
|
|
|
href="http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.5/errata/patches/Shorewall-perl/patch-perl-4.0.5-4.diff">http://www1.shorewall.net/pub/shorewall/4.0/shorewall-4.0.5/errata/patches/Shorewall-perl/patch-perl-4.0.5-4.diff</a>.</p>
|
2007-11-27 16:25:28 +01:00
|
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|
<hr>
|
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|
<h2><a name="Notice1">Important Notice to Users of BRIDGING=Yes</a></h2>
|
2008-01-25 23:06:47 +01:00
|
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|
<p>In Linux Kernel version 2.6.20, the Netfilter team changed Physdev
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|
Match
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so that it is no longer capable of supporting BRIDGING=Yes. The
|
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|
solutions
|
2007-11-27 16:25:28 +01:00
|
|
|
available to users are to either:</p>
|
|
|
|
|
<ol>
|
|
|
|
|
<li>Switch to using the technique described at <a
|
2008-01-25 23:06:47 +01:00
|
|
|
href="http://www.shorewall.net/3.0/NewBridge.html">http://www.shorewall.net/3.0/NewBridge.html</a>;
|
|
|
|
|
or<br>
|
|
|
|
|
</li>
|
|
|
|
|
<li>Upgrade to Shorewall 4.0, migrate to using Shorewall-perl, and
|
|
|
|
|
follow the instructions at <a
|
|
|
|
|
href="http://www1.shorewall.net/bridge-Shorewall-perl.html">http://www1.shorewall.net/bridge-Shorewall-perl.html.</a>
|
2007-11-27 16:25:28 +01:00
|
|
|
</li>
|
|
|
|
|
</ol>
|
2008-01-25 23:06:47 +01:00
|
|
|
<p>The first approach allows you to switch back and forth between
|
|
|
|
|
kernels
|
2007-11-27 16:25:28 +01:00
|
|
|
older and newer than 2.6.20. The second approach is a better long-term
|
|
|
|
|
solution.</p>
|
2007-08-22 20:45:12 +02:00
|
|
|
<hr>
|
2006-03-23 18:18:44 +01:00
|
|
|
<h2><a name="Leaf"></a>Leaf</h2>
|
2007-10-03 04:34:25 +02:00
|
|
|
<p><font color="#000080"><a href="http://leaf.sourceforge.net/"
|
2008-01-25 23:06:47 +01:00
|
|
|
target="_top"><font color="#000080"><img alt="(Leaf Logo)"
|
|
|
|
|
src="images/leaflogo.gif" name="Graphic1" align="bottom" border="1"
|
|
|
|
|
height="39" width="52"></font></a></font> LEAF is an open source
|
|
|
|
|
project which provides a
|
|
|
|
|
Firewall/router on a floppy, CD or CF. Several LEAF distributions
|
|
|
|
|
including
|
2007-04-23 00:01:55 +02:00
|
|
|
Bering and Bering-uClibc use Shorewall as their Netfilter configuration
|
|
|
|
|
tool.</p>
|
2006-03-23 18:18:44 +01:00
|
|
|
<hr>
|
|
|
|
|
<h2><a name="OpenWRT"></a>OpenWRT</h2>
|
2008-01-25 23:06:47 +01:00
|
|
|
<p style="margin-bottom: 0in;"><font color="#000000"><a
|
2007-12-29 17:31:49 +01:00
|
|
|
href="http://openwrt.org/"><font color="#000080"><img
|
2008-01-25 23:06:47 +01:00
|
|
|
alt="(OpenWRT Logo)" src="images/openwrt.png" name="graphics1"
|
|
|
|
|
align="bottom" border="1" height="34" hspace="4" width="91"></font></a></font>OpenWRT
|
|
|
|
|
is a
|
2007-04-23 00:01:55 +02:00
|
|
|
project which provides open source firmware for Linksys WRT54G wireless
|
|
|
|
|
routers. Two different Shorewall packages are available for OpenWRT.</p>
|
2006-03-23 18:18:44 +01:00
|
|
|
<hr>
|
|
|
|
|
<h2><a name="Donations"></a>Donations</h2>
|
2007-10-03 04:34:25 +02:00
|
|
|
<p><a href="http://www.alz.org/" target="_top"><font color="#000080"><img
|
2008-01-25 23:06:47 +01:00
|
|
|
alt="(Alzheimer's Association Logo)" src="images/alz_logo2.gif"
|
|
|
|
|
name="Graphic2" align="right" border="1" height="66" width="306"></font></a><a
|
|
|
|
|
href="http://www.starlight.org/" target="_top"><font color="#000080"><img
|
|
|
|
|
alt="(Starlight Foundation Logo)" src="images/newlog.gif"
|
|
|
|
|
name="Graphic3" align="right" border="1" height="108" width="65"></font></a>Shorewall
|
|
|
|
|
is free but if you try it and
|
2007-10-03 04:34:25 +02:00
|
|
|
find it useful, please consider making a donation to the <a
|
2008-01-25 23:06:47 +01:00
|
|
|
href="http://www.alz.org/" target="_top">Alzheimer's Association</a>
|
|
|
|
|
or to
|
|
|
|
|
the <a href="http://www.starlight.org/" target="_top">Starlight
|
|
|
|
|
Children's
|
2007-04-23 00:01:55 +02:00
|
|
|
Foundation</a>. <br>
|
2006-03-23 18:18:44 +01:00
|
|
|
<br>
|
|
|
|
|
Thank You</p>
|
|
|
|
|
<p align="left"><br>
|
|
|
|
|
<br>
|
|
|
|
|
</p>
|
2007-10-03 04:34:25 +02:00
|
|
|
</body>
|
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</html>
|
