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shorewall_code/Shorewall-docs/shorewall_prerequisites.xml
2003-12-28 17:56:45 +00:00

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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">
<article id="shorewall_prerequisites">
<!--$Id$-->
<articleinfo>
<title>Shorewall Requirements</title>
<author>
<firstname>Tom</firstname>
<surname>Eastep</surname>
</author>
<pubdate>2003-12-01</pubdate>
<copyright>
<year>2001-2003</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 Requires:</title>
<itemizedlist>
<listitem>
<para>A kernel that supports netfilter. I&#39;ve tested with 2.4.2 -
2.4.23. 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
&#60;= n &#60;= 255) is left shifted by 24 bits. You can check this at
a shell prompt by:<itemizedlist><listitem><para>echo $((128 &#60;&#60;
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>