<?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"> <article id="Shorewall_Doesnt"> <!--$Id$--> <articleinfo> <title>Some Things that Shorewall Cannot Do</title> <author> <firstname>Tom</firstname> <surname>Eastep</surname> </author> <pubdate>2003-10-07</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 url="GnuCopyright.htm">GNU Free Documentation License</ulink></quote>.</para> </legalnotice> </articleinfo> <section> <title>Shorewall Cannot:</title> <itemizedlist> <listitem> <para>Be used to filter traffic through a Layer 2 Bridge</para> </listitem> <listitem> <para>Act as a <quote>Personal Firewall</quote> that allows internet access by application.</para> </listitem> <listitem> <para>Be used with an Operating System other than Linux (version >= 2.4.0)</para> </listitem> <listitem> <para>Do content filtering:</para> <itemizedlist> <listitem> <para>HTTP - better to use <ulink url="Shorewall_Squid_Usage.html">Squid</ulink> for that.</para> </listitem> <listitem> <para>Email -- Install something like <ulink url="http://www.postfix.org">Postfix</ulink> on your firewall and integrate it with <ulink url="http://www.spamassassin.org/">SpamAssassin</ulink> and <ulink url="http://www.ijs.si/software/amavisd/">Amavisd-new</ulink>.</para> </listitem> </itemizedlist> </listitem> </itemizedlist> </section> <section> <title>In Addition:</title> <itemizedlist> <listitem> <para>Shorewall does not contain any support for Netfilter <ulink url="http://www.netfilter.org/documentation/pomlist/pom-summary.html">Patch-O-Matic</ulink> features -- Shorewall only supports features from released kernels.</para> </listitem> </itemizedlist> </section> </article>