mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-08 08:44:05 +01:00
aac55dbac4
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@8667 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
124 lines
4.4 KiB
XML
124 lines
4.4 KiB
XML
<?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="GenericTunnels">
|
|
<!--$Id$-->
|
|
|
|
<articleinfo>
|
|
<title>Generic Tunnels</title>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<firstname>Tom</firstname>
|
|
|
|
<surname>Eastep</surname>
|
|
</author>
|
|
</authorgroup>
|
|
|
|
<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
|
|
|
|
<copyright>
|
|
<year>2001</year>
|
|
|
|
<year>2002</year>
|
|
|
|
<year>2003</year>
|
|
|
|
<year>2005</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>
|
|
|
|
<para>Shorewall includes built-in support for a wide range of VPN solutions.
|
|
If you have need for a tunnel type that does not have explicit support, you
|
|
can generally describe the tunneling software using <quote>generic
|
|
tunnels</quote>.</para>
|
|
|
|
<section id="Bridged">
|
|
<title>Bridging two Masqueraded Networks</title>
|
|
|
|
<para>Suppose that we have the following situation:</para>
|
|
|
|
<graphic fileref="images/TwoNets1.png" />
|
|
|
|
<para>We want systems in the 192.168.1.0/24 subnetwork to be able to
|
|
communicate with the systems in the 10.0.0.0/8 network. This is
|
|
accomplished through use of the /etc/shorewall/tunnels file, the
|
|
/etc/shorewall/policy file and the /etc/shorewall/tunnel script that is
|
|
included with Shorewall.</para>
|
|
|
|
<para>Suppose that you have tunneling software that uses two different
|
|
protocols:</para>
|
|
|
|
<orderedlist numeration="loweralpha">
|
|
<listitem>
|
|
<para>TCP port 1071</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>GRE (Protocol 47)</para>
|
|
</listitem>
|
|
|
|
<listitem>
|
|
<para>The tunnel interface on system A is <quote>tun0</quote> and the
|
|
tunnel interface on system B is also <quote>tun0</quote>.</para>
|
|
</listitem>
|
|
</orderedlist>
|
|
|
|
<para>On each firewall, you will need to declare a zone to represent the
|
|
remote subnet. We'll assume that this zone is called <quote>vpn</quote>
|
|
and declare it in /etc/shorewall/zones on both systems as follows.</para>
|
|
|
|
<programlisting>#ZONE TYPE OPTIONS
|
|
vpn ipv4</programlisting>
|
|
|
|
<para>On system A, the 10.0.0.0/8 will comprise the <emphasis
|
|
role="bold">vpn</emphasis> zone. In /etc/shorewall/interfaces:</para>
|
|
|
|
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
vpn tun0 10.255.255.255</programlisting>
|
|
|
|
<para>In /etc/shorewall/tunnels on system A, we need the following:</para>
|
|
|
|
<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
|
|
generic:tcp:1071 net 134.28.54.2
|
|
generic:47 net 134.28.54.2</programlisting>
|
|
|
|
<para>These entries in /etc/shorewall/tunnels, opens the firewall so that
|
|
TCP port 1071 and the Generalized Routing Encapsulation Protocol (47) will
|
|
be accepted to/from the remote gateway.</para>
|
|
|
|
<programlisting>#ZONE INTERFACE BROADCAST OPTIONS
|
|
vpn tun0 192.168.1.255</programlisting>
|
|
|
|
<para>In /etc/shorewall/tunnels on system B, we have:</para>
|
|
|
|
<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
|
|
generic:tcp:1071 net 206.191.148.9
|
|
generic:47 net 206.191.148.9</programlisting>
|
|
|
|
<para>You will need to allow traffic between the <quote>vpn</quote> zone
|
|
and the <quote>loc</quote> zone on both systems -- if you simply want to
|
|
admit all traffic in both directions, you can use the policy file:</para>
|
|
|
|
<programlisting>#SOURCE DEST POLICY LOG LEVEL
|
|
loc vpn ACCEPT
|
|
vpn loc ACCEPT</programlisting>
|
|
|
|
<para>On both systems, restart Shorewall and start your VPN software on
|
|
each system. The systems in the two masqueraded subnetworks can now talk
|
|
to each other</para>
|
|
</section>
|
|
</article>
|