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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- $Id$ -->
<article id="usefull_links">
<articleinfo>
<title>Introduction</title>
<author>
<firstname>Tom</firstname>
<surname>Eastep</surname>
</author>
<pubdate>2003/12/23</pubdate>
<copyright>
<year>2003</year>
<holder>Thomas M. Eastep</holder>
</copyright>
<legalnotice>
<para>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
<quote><ulink type="" url="Copyright.htm">GNU Free Documentation License</ulink></quote>.</para>
</legalnotice>
</articleinfo>
<section>
<title>Introduction</title>
<para>The information in this document applies only to 1.4.x releases of
Shorewall.</para>
<section>
<title>Glossary</title>
<itemizedlist>
<listitem>
<para><ulink url="http://www.netfilter.org">Netfilter</ulink> - the
packet filter facility built into the 2.4 and later Linux kernels.
</para>
</listitem>
<listitem>
<para>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.</para>
</listitem>
<listitem>
<para>iptables - the utility program used to configure and control
Netfilter. The term &#39;iptables&#39; is often used to refer to the
combination of iptables+Netfilter (with Netfilter not in ipchains
compatibility mode).</para>
</listitem>
</itemizedlist>
</section>
<section>
<title>What is Shorewall?</title>
<para>The Shoreline Firewall, more commonly known as
&#34;Shorewall&#34;, is 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&#39;s ipchains
compatibility mode and can thus take advantage of Netfilter&#39;s
connection state tracking capabilities.</para>
<para>Shorewall is not a daemon. Once Shorewall has configured
Netfilter, it&#39;s job is complete although the <ulink
url="starting_and_stopping_shorewall.htm">/sbin/shorewall program can be
used at any time to monitor the Netfilter firewall</ulink>.</para>
</section>
<section>
<title>Getting Started with Shorewall</title>
<para>New to Shorewall? Start by selecting the <ulink
url="shorewall_quickstart_guide.htm">QuickStart Guide</ulink> that most
closely match your environment and follow the step by step instructions.</para>
</section>
<section>
<title>Looking for Information?</title>
<para>The <ulink url="shorewall_quickstart_guide.htm#Documentation">Documentation
Index</ulink> is a good place to start.</para>
</section>
</section>
<section>
<title>License</title>
<para>This program is free software; you can redistribute it and/or modify
it under the terms of <ulink url="http://www.gnu.org/licenses/gpl.html">Version
2 of the GNU General Public License</ulink> as published by the Free
Software Foundation.</para>
<para>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.</para>
<para>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</para>
</section>
</article>