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<title>Shoreline Firewall (Shorewall) 2.0</title>
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<h1>Shorewall 2.x</h1>
<h2><a href="News.htm#20050717"><font color="#ff0000">Security
vulnerability in Shorewall 2.x</font></a></h2>
<hr style="width: 100%; height: 2px;">
<p>The information on this site applies only to 2.x releases of
Shorewall. For other versions:</p>
<ul>
<li>
<p style="margin-bottom: 0in;">The 1.4 site is <a
href="http://www.shorewall.net/1.4" target="_top">here.</a></p>
</li>
<li>
<p style="margin-bottom: 0in;">The 1.3 site is <a
href="http://www.shorewall.net/1.3" target="_top">here.</a></p>
</li>
<li>
<p>The 1.2 site is <a href="http://shorewall.net/1.2/"
target="_top">here</a>.</p>
</li>
<li>The 3.0 documentation (preliminary) is <a
href="http://www1.shorewall.net/3.0/">here</a>.</li>
</ul>
<p>The current 2.4 Stable Release is 2.4.5 -- Here are the <a
href="http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.5/releasenotes.txt">
release notes</a> and here are the <a
href="http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.5/known_problems.txt">
known problems</a> and <a
href="http://shorewall.net/pub/shorewall/2.4/shorewall-2.4.5/errata/">
updates</a>.<br>
<br>
The current Development Release is&nbsp; 3.0.0 Beta 1 -- Here are the <a
href="http://shorewall.net/pub/shorewall/3.0/shorewall-3.0.0-Beta1/releasenotes.txt">
release notes</a>.<br>
<br>
Copyright © 2001-2005 Thomas M. Eastep</p>
<p>Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version
1.2 or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover, and with no Back-Cover
Texts. A copy of the license is included in the section entitled “<a
href="GnuCopyright.htm" target="_self">GNU Free Documentation License</a>”.</p>
<p>2005-10-14</p>
<hr style="width: 100%; height: 2px;">
<h3>Table of Contents</h3>
<p style="margin-left: 0.42in; margin-bottom: 0in;"><a href="#Intro">Introduction
to Shorewall</a></p>
<p style="margin-left: 0.83in; margin-bottom: 0in;"><a href="#Glossary">Glossary</a><br>
<a href="#WhatIs">What is Shorewall?</a><br>
<a href="#GettingStarted">Getting Started with Shorewall</a><br>
<a href="#Info">Looking for Information?</a><br>
<a href="#Mandrake">Running Shorewall on Mandrake® with a two-interface
setup?</a><br>
<a href="#License">License</a><br>
</p>
<div style="margin-left: 40px;"> <br>
<a href="#Leaf">Leaf</a><br>
<br>
<a href="#OpenWRT">OpenWRT</a><br>
</div>
<p style="margin-left: 40px;"><a href="#Donations">Donations</a></p>
<h2><a name="Intro"></a>Introduction to Shorewall</h2>
<h3><a name="Glossary"></a>Glossary</h3>
<ul>
<li>
<p style="margin-bottom: 0in;"><a href="http://www.netfilter.org/"
target="_top">Netfilter</a> - the packet filter facility built into
the 2.4 and later Linux kernels.</p>
</li>
<li>
<p style="margin-bottom: 0in;">ipchains - the packet filter
facility built into the 2.2 Linux kernels. Also the name of the utility
program used to configure and control that facility. Netfilter can be
used in ipchains compatibility mode.</p>
</li>
<li>
<p>iptables - the utility program used to configure and control
Netfilter. The term 'iptables' is often used to refer to the
combination of iptables+Netfilter (with Netfilter not in ipchains
compatibility mode).</p>
</li>
</ul>
<h3><a name="WhatIs"></a>What is Shorewall?</h3>
<p style="margin-left: 0.42in;">The Shoreline Firewall, more commonly
known as "Shorewall", is a high-level tool for configuring Netfilter.
You describe your firewall/gateway requirements using entries in a set
of configuration files. Shorewall reads those configuration files and
with the help of the iptables utility, Shorewall configures Netfilter
to match your requirements. Shorewall can be used on a dedicated
firewall system, a multi-function gateway/router/server or on a
standalone GNU/Linux system. Shorewall does not use Netfilter's
ipchains compatibility mode and can thus take advantage of Netfilter's <a
href="http://www.cs.princeton.edu/%7Ejns/security/iptables/iptables_conntrack.html"
target="_top">connection state tracking capabilities</a>.<br>
<br>
Shorewall is <u>not</u> a daemon. Once Shorewall has configured
Netfilter, it's job is complete. After that, there is no Shorewall code
running although the <a href="starting_and_stopping_shorewall.htm">/sbin/shorewall
program can be used at any time to monitor the Netfilter firewall</a>.<br>
</p>
<p style="margin-left: 0.42in;">Shorewall is not the easiest to use of
the available iptables configuration tools but I believe that it is the
most flexible and powerful. So if you are looking for a simple
point-and-click set-and-forget Linux firewall solution that requires a
minimum of networking knowledge, I would encourage you to check out the
following alternatives:</p>
<ul style="margin-left: 40px;">
<li><a href="http://www.m0n0.ch/wall">http://www.m0n0.ch/wall</a></li>
<li><a href="http://www.fs-security.com/">http://www.fs-security.com/</a><br>
</li>
</ul>
<p style="margin-left: 0.42in;">On the other hand, if you are looking
for a Linux firewall solution that can handle complex and fast changing
network environments then Shorewall is a logical choice.<br>
</p>
<h3><a name="GettingStarted"></a>Getting Started with Shorewall</h3>
<p style="margin-left: 0.42in;">New to Shorewall? Start by selecting
the <a href="shorewall_quickstart_guide.htm">QuickStart Guide</a> that
most closely matches your environment and follow the step by step
instructions.</p>
<h3><a name="Info"></a>Looking for Information?</h3>
<p style="margin-left: 0.42in;">The <a href="Documentation_Index.html">Documentation
Index</a> is a good place to start as is the Site Search in the frame
above.<br>
</p>
<h3><a name="Mandrake"></a>Running Shorewall on Mandrake® with a
two-interface setup?</h3>
<p style="margin-left: 0.42in;">If so, the documentation on this site
will 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 and installing a setup that matches the
documentation on this site. See the <a href="two-interface.htm">Two-interface
QuickStart Guide</a> for details.<br>
<br>
<b>Update:</b> I have been informed by Mandrake Development that this
problem has been corrected in Mandrake 10.0 Final (the problem still
exists in the 10.0 Community release).</p>
<h3><a name="License"></a>License</h3>
<p style="margin-left: 0.42in;">This program is free software; you can
redistribute it and/or modify it under the terms of <a
href="http://www.gnu.org/licenses/gpl.html">Version 2 of the GNU
General Public License</a> as published by the Free Software Foundation.</p>
<p style="margin-left: 0.42in;">This program is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more detail.</p>
<p style="margin-left: 0.42in;">You should have received a copy of the
GNU General Public License along with this program; if not, write to
the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
USA</p>
<p style="margin-left: 0.42in;">Permission is granted to copy,
distribute and/or modify this document under the terms of the GNU Free
Documentation License, Version 1.2 or any later version published by
the Free Software Foundation; with no Invariant Sections, with no
Front-Cover, and with no Back-Cover Texts. A copy of the license is
included in the section entitled "GNU Free Documentation License".</p>
<hr>
<h2><a name="Leaf"></a>Leaf</h2>
<p><a href="http://leaf.sourceforge.net/" target="_top"><font
color="#000000"><img src="images/leaflogo.gif" name="Graphic1"
alt="(Leaf Logo)" align="bottom" border="1" height="39" width="52"></font></a>
LEAF is an open source project which provides a Firewall/router on a
floppy, CD or CF. Several LEAF distributions including Bering and
Bering-uClibc use Shorewall as their Netfilter configuration tool.</p>
<hr style="width: 100%; height: 2px;">
<h2><a name="OpenWRT"></a>OpenWRT</h2>
<a href="http://openwrt.org"><img alt="(OpenWRT Logo)"
src="images/openwrt.png"
style="border: 0px solid ; width: 88px; height: 31px;" hspace="4"></a>OpenWRT
is a project which provides open source firmware for Linksys WRT54G
wireless routers. Two different Shorewall packages are available for
OpenWRT.<br>
<hr>
<h2><a name="Donations"></a>Donations</h2>
<p align="left"><a href="http://www.alz.org/" target="_top"><font
color="#000000"><img src="images/alz_logo2.gif" name="Graphic2"
alt="(Alzheimer's Association Logo)" align="right" border="1"
height="63" width="303"></font></a><a href="http://www.starlight.org/"
target="_top"><font color="#000000"><img src="images/newlog.gif"
name="Graphic3" alt="(Starlight Foundation Logo)" align="right"
border="1" height="105" width="62"></font></a><font size="4">Shorewall
is free but if you try it and find it useful, please consider making a
donation to the <a 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 Foundation</a>.</font></p>
<p align="left"><font size="4">Thank You<br>
</font></p>
<p align="left"><br>
<br>
</p>
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