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80 lines
2.4 KiB
XML
80 lines
2.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>Shorewall on a Laptop</title>
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<authorgroup>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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</authorgroup>
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<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
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<copyright>
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<year>2009</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section>
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<title>Overview</title>
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<para>Laptop computers generally have several network interfaces, one of
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which will be used at a time.</para>
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<orderedlist>
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<listitem>
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<para>Ethernet interface ‒ Used when the computer is on the desktop at
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home or at work.</para>
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</listitem>
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<listitem>
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<para>Wireless interface ‒ Used when the laptop is being used in a
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cafe, train or airline terminal.</para>
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</listitem>
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<listitem>
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<para>Point-to-point (PPP) interface ‒ Used when neither wired nor
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wireless service are available.</para>
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</listitem>
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</orderedlist>
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<para>Shorewall can be configured to treat these interfaces the same and
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to be able to switch between them without having to reconfigure.</para>
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</section>
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<section>
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<title>Configuration</title>
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<para>The key to configuring Shorewall on a laptop is to define multiple
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optional interfaces for the 'net' zone in
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<filename>/etc/shorewall/interfaces</filename>.</para>
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<programlisting>#ZONE INTERFACE OPTIONS
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net eth0 optional,…
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net wlan0 optional,…
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net ppp0 optional,…</programlisting>
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<para>With this configuration, access to the 'net' zone is possible
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regardless of which of the interfaces is being used.</para>
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</section>
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</article>
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