mirror of
https://gitlab.com/shorewall/code.git
synced 2024-12-15 19:01:19 +01:00
4033e6051b
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@3521 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
111 lines
4.4 KiB
XML
111 lines
4.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<article>
|
|
<!--$Id$-->
|
|
|
|
<articleinfo>
|
|
<title>6to4 Tunnels</title>
|
|
|
|
<authorgroup>
|
|
<author>
|
|
<firstname>Eric</firstname>
|
|
|
|
<surname>de Thouars</surname>
|
|
</author>
|
|
|
|
<author>
|
|
<firstname>Tom</firstname>
|
|
|
|
<surname>Eastep</surname>
|
|
</author>
|
|
</authorgroup>
|
|
|
|
<pubdate>2004-01-05</pubdate>
|
|
|
|
<copyright>
|
|
<year>2003-2004</year>
|
|
|
|
<holder>Eric de Thoars and Tom 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>
|
|
|
|
<warning>
|
|
<para>The 6to4 tunnel feature of Shorewall only facilitates IPv6 over IPv4
|
|
tunneling. It does not provide any IPv6 security measures.</para>
|
|
</warning>
|
|
|
|
<para>6to4 tunneling with Shorewall can be used to connect your IPv6 network
|
|
to another IPv6 network over an IPv4 infrastructure.</para>
|
|
|
|
<para>More information on Linux and IPv6 can be found in the <ulink
|
|
url="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO">Linux IPv6 HOWTO</ulink>.
|
|
Details on how to setup a 6to4 tunnels are described in the section <ulink
|
|
url="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/configuring-ipv6to4-tunnels.html">Setup
|
|
of 6to4 tunnels</ulink>.</para>
|
|
|
|
<section>
|
|
<title>Connecting two IPv6 Networks</title>
|
|
|
|
<para>Suppose that we have the following situation:</para>
|
|
|
|
<graphic fileref="images/TwoIPv6Nets1.png" />
|
|
|
|
<para>We want systems in the 2002:100:333::/64 subnetwork to be able to
|
|
communicate with the systems in the 2002:488:999::/64 network. This is
|
|
accomplished through use of the <filename><filename>/etc/shorewall/tunnels</filename></filename>
|
|
file and the <quote>ip</quote> utility for network interface and routing
|
|
configuration.</para>
|
|
|
|
<para>Unlike GRE and IPIP tunneling, the <filename>/etc/shorewall/policy</filename>,
|
|
<filename>/etc/shorewall/interfaces</filename> and <filename>/etc/shorewall/zones</filename>
|
|
files are not used. There is no need to declare a zone to represent the
|
|
remote IPv6 network. This remote network is not visible on IPv4 interfaces
|
|
and to iptables. All that is visible on the IPv4 level is an IPv4 stream
|
|
which contains IPv6 traffic. Separate IPv6 interfaces and ip6tables rules
|
|
need to be defined to handle this traffic.</para>
|
|
|
|
<para>In <filename>/etc/shorewall/tunnels </filename>on system A, we need
|
|
the following:</para>
|
|
|
|
<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
|
|
6to4 net 134.28.54.2</programlisting>
|
|
|
|
<para>This entry in <filename>/etc/shorewall/tunnels</filename>, opens the
|
|
firewall so that the IPv6 encapsulation protocol (41) will be accepted
|
|
to/from the remote gateway.</para>
|
|
|
|
<para>Use the following commands to setup system A:</para>
|
|
|
|
<programlisting>><command>ip tunnel add tun6to4 mode sit ttl 254 remote 134.28.54.2</command>
|
|
><command>ip link set dev tun6to4 up</command>
|
|
><command>ip addr add 3ffe:8280:0:2001::1/64 dev tun6to4</command>
|
|
><command>ip route add 2002:488:999::/64 via 3ffe:8280:0:2001::2</command></programlisting>
|
|
|
|
<para>Similarly, in <filename>/etc/shorewall/tunnels</filename> on system
|
|
B we have:</para>
|
|
|
|
<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
|
|
6to4 net 206.191.148.9</programlisting>
|
|
|
|
<para>And use the following commands to setup system B:</para>
|
|
|
|
<programlisting>><command>ip tunnel add tun6to4 mode sit ttl 254 remote 206.191.148.9</command>
|
|
><command>ip link set dev tun6to4 up</command>
|
|
><command>ip addr add 3ffe:8280:0:2001::2/64 dev tun6to4</command>
|
|
><command>ip route add 2002:100:333::/64 via 3ffe:8280:0:2001::1</command></programlisting>
|
|
|
|
<para>On both systems, restart Shorewall and issue the configuration
|
|
commands as listed above. The systems in both IPv6 subnetworks can now
|
|
talk to each other using IPv6.</para>
|
|
</section>
|
|
</article> |