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shorewall_code/docs/Laptop.xml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
<article>
<!--$Id$-->
<articleinfo>
<title>Shorewall on a Laptop</title>
<authorgroup>
<author>
<firstname>Tom</firstname>
<surname>Eastep</surname>
</author>
</authorgroup>
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
<copyright>
<year>2009</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>Overview</title>
<para>Laptop computers generally have several network interfaces, one of
which will be used at a time.</para>
<orderedlist>
<listitem>
<para>Ethernet interface Used when the computer is on the desktop at
home or at work.</para>
</listitem>
<listitem>
<para>Wireless interface Used when the laptop is being used in a
cafe, train or airline terminal.</para>
</listitem>
<listitem>
<para>Point-to-point (PPP) interface Used when neither wired nor
wireless service are available.</para>
</listitem>
</orderedlist>
<para>Shorewall can be configured to treat these interfaces the same and
to be able to switch between them without having to reconfigure.</para>
</section>
<section>
<title>Configuration</title>
<para>The key to configuring Shorewall on a laptop is to define multiple
optional interfaces for the 'net' zone in
<filename>/etc/shorewall/interfaces</filename>.</para>
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
net eth0 detect optional,…
net wlan0 detect optional,…
net ppp0 - optional,…</programlisting>
<para>With this configuration, access to the 'net' zone is possible
regardless of which of the interfaces is being used.</para>
</section>
</article>