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124 lines
4.3 KiB
XML
124 lines
4.3 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 id="GenericTunnels">
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<!--$Id$-->
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<articleinfo>
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<title>Generic Tunnels</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>2001</year>
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<year>2002</year>
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<year>2003</year>
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<year>2005</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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<para>Shorewall includes built-in support for a wide range of VPN solutions.
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If you have need for a tunnel type that does not have explicit support, you
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can generally describe the tunneling software using <quote>generic
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tunnels</quote>.</para>
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<section id="Bridged">
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<title>Bridging two Masqueraded Networks</title>
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<para>Suppose that we have the following situation:</para>
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<graphic fileref="images/TwoNets1.png" />
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<para>We want systems in the 192.168.1.0/24 subnetwork to be able to
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communicate with the systems in the 10.0.0.0/8 network. This is
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accomplished through use of the /etc/shorewall/tunnels file, the
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/etc/shorewall/policy file and the /etc/shorewall/tunnel script that is
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included with Shorewall.</para>
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<para>Suppose that you have tunneling software that uses two different
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protocols:</para>
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<orderedlist numeration="loweralpha">
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<listitem>
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<para>TCP port 1071</para>
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</listitem>
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<listitem>
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<para>GRE (Protocol 47)</para>
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</listitem>
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<listitem>
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<para>The tunnel interface on system A is <quote>tun0</quote> and the
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tunnel interface on system B is also <quote>tun0</quote>.</para>
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</listitem>
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</orderedlist>
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<para>On each firewall, you will need to declare a zone to represent the
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remote subnet. We'll assume that this zone is called <quote>vpn</quote>
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and declare it in /etc/shorewall/zones on both systems as follows.</para>
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<programlisting>#ZONE TYPE OPTIONS
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vpn ipv4</programlisting>
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<para>On system A, the 10.0.0.0/8 will comprise the <emphasis
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role="bold">vpn</emphasis> zone. In /etc/shorewall/interfaces:</para>
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<programlisting>#ZONE INTERFACE OPTIONS
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vpn tun0</programlisting>
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<para>In /etc/shorewall/tunnels on system A, we need the following:</para>
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<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
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generic:tcp:1071 net 134.28.54.2
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generic:47 net 134.28.54.2</programlisting>
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<para>These entries in /etc/shorewall/tunnels, opens the firewall so that
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TCP port 1071 and the Generalized Routing Encapsulation Protocol (47) will
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be accepted to/from the remote gateway.</para>
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<programlisting>#ZONE INTERFACE OPTIONS
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vpn tun0</programlisting>
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<para>In /etc/shorewall/tunnels on system B, we have:</para>
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<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
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generic:tcp:1071 net 206.191.148.9
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generic:47 net 206.191.148.9</programlisting>
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<para>You will need to allow traffic between the <quote>vpn</quote> zone
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and the <quote>loc</quote> zone on both systems -- if you simply want to
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admit all traffic in both directions, you can use the policy file:</para>
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<programlisting>#SOURCE DEST POLICY LOG LEVEL
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loc vpn ACCEPT
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vpn loc ACCEPT</programlisting>
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<para>On both systems, restart Shorewall and start your VPN software on
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each system. The systems in the two masqueraded subnetworks can now talk
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to each other</para>
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</section>
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</article>
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