<?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_prerequisites"> <!--$Id$--> <articleinfo> <title>Shorewall Requirements</title> <author> <firstname>Tom</firstname> <surname>Eastep</surname> </author> <pubdate>2004-05-31</pubdate> <copyright> <year>2001-2004</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 Requires:</title> <itemizedlist> <listitem> <para>A kernel that supports netfilter. I've tested with 2.4.2 - 2.6.6. With current releases of Shorewall, Traffic Shaping/Control requires at least 2.4.18. Check <ulink url="kernel.htm">here</ulink> for kernel configuration information. If you are looking for a firewall for use with 2.2 kernels, see <ulink url="http://seawall.sourceforge.net">the Seattle Firewall site</ulink>.</para> </listitem> <listitem> <para>iptables 1.2 or later but beware version 1.2.3 -- see the <ulink url="errata.htm">Errata</ulink>.</para> <warning> <para>The buggy iptables version 1.2.3 is included in RedHat 7.2 and you should upgrade to iptables 1.2.4 prior to installing Shorewall. Version 1.2.4 is available <ulink url="http://www.redhat.com/support/errata/RHSA-2001-144.html">from RedHat</ulink> and in the <ulink url="errata.htm">Shorewall Errata</ulink>.</para> </warning> </listitem> <listitem> <para>Iproute (<quote>ip</quote> utility). The iproute package is included with most distributions but may not be installed by default. The official download site is <ulink type="remote" url="ftp://ftp.inr.ac.ru/ip-routing">ftp://ftp.inr.ac.ru/ip-routing</ulink>.</para> </listitem> <listitem> <para>A Bourne shell or derivative such as bash or ash. This shell must have correct support for variable expansion formats ${<emphasis>variable%pattern</emphasis>}, ${<emphasis>variable%%pattern</emphasis>}, ${<emphasis>variable#pattern</emphasis>} and ${<emphasis>variable##pattern</emphasis>}.</para> </listitem> <listitem> <para>Your shell must produce a sensible result when a number n (128 <= n <= 255) is left shifted by 24 bits. You can check this at a shell prompt by:<itemizedlist><listitem><para>echo $((128 << 24))</para></listitem><listitem><para>The result must be either 2147483648 or -2147483648.</para></listitem></itemizedlist></para> </listitem> <listitem> <para>The firewall monitoring display is greatly improved if you have awk (gawk) installed.</para> </listitem> </itemizedlist> </section> </article>