2009-03-15 16:54:11 +01:00
|
|
|
|
<?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>
|
|
|
|
|
|
|
2016-02-18 18:38:50 +01:00
|
|
|
|
<programlisting>#ZONE INTERFACE OPTIONS
|
|
|
|
|
|
net eth0 optional,…
|
|
|
|
|
|
net wlan0 optional,…
|
|
|
|
|
|
net ppp0 optional,…</programlisting>
|
2009-03-15 16:54:11 +01:00
|
|
|
|
|
|
|
|
|
|
<para>With this configuration, access to the 'net' zone is possible
|
|
|
|
|
|
regardless of which of the interfaces is being used.</para>
|
|
|
|
|
|
</section>
|
|
|
|
|
|
</article>
|
