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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@8672 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
115 lines
4.4 KiB
XML
115 lines
4.4 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>6to4 Tunnels</title>
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<authorgroup>
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<author>
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<firstname>Eric</firstname>
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<surname>de Thouars</surname>
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</author>
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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>2003-2004</year>
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<holder>Eric de Thouars and Tom 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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<warning>
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<para>The 6to4 tunnel feature of Shorewall only facilitates IPv6 over IPv4
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tunneling. It does not provide any IPv6 security measures.</para>
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</warning>
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<para>6to4 tunneling with Shorewall can be used to connect your IPv6 network
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to another IPv6 network over an IPv4 infrastructure.</para>
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<para>More information on Linux and IPv6 can be found in the <ulink
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url="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO">Linux IPv6 HOWTO</ulink>.
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Details on how to setup a 6to4 tunnels are described in the section <ulink
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url="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/configuring-ipv6to4-tunnels.html">Setup
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of 6to4 tunnels</ulink>.</para>
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<section id="Tunnel6to4">
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<title>Connecting two IPv6 Networks</title>
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<para>Suppose that we have the following situation:</para>
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<graphic fileref="images/TwoIPv6Nets1.png" />
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<para>We want systems in the 2002:100:333::/64 subnetwork to be able to
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communicate with the systems in the 2002:488:999::/64 network. This is
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accomplished through use of the <filename>/etc/shorewall/tunnels</filename>
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file and the <quote>ip</quote> utility for network interface and routing
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configuration.</para>
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<para>Unlike GRE and IPIP tunneling, the
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<filename>/etc/shorewall/policy</filename>,
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<filename>/etc/shorewall/interfaces</filename> and
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<filename>/etc/shorewall/zones</filename> files are not used. There is no
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need to declare a zone to represent the remote IPv6 network. This remote
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network is not visible on IPv4 interfaces and to iptables. All that is
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visible on the IPv4 level is an IPv4 stream which contains IPv6 traffic.
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Separate IPv6 interfaces and ip6tables rules need to be defined to handle
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this traffic.</para>
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<para>In <filename>/etc/shorewall/tunnels</filename> on system A, we need
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the following:</para>
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<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
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6to4 net 134.28.54.2</programlisting>
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<para>This entry in <filename>/etc/shorewall/tunnels</filename> opens the
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firewall so that the IPv6 encapsulation protocol (41) will be accepted
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to/from the remote gateway.</para>
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<para>Use the following commands to setup system A:</para>
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<programlisting>><command>ip tunnel add tun6to4 mode sit ttl 254 remote 134.28.54.2</command>
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><command>ip link set dev tun6to4 up</command>
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><command>ip addr add 3ffe:8280:0:2001::1/64 dev tun6to4</command>
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><command>ip route add 2002:488:999::/64 via 3ffe:8280:0:2001::2</command></programlisting>
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<para>Similarly, in <filename>/etc/shorewall/tunnels</filename> on system
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B we have:</para>
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<programlisting>#TYPE ZONE GATEWAY GATEWAY ZONE
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6to4 net 206.191.148.9</programlisting>
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<para>And use the following commands to setup system B:</para>
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<programlisting>><command>ip tunnel add tun6to4 mode sit ttl 254 remote 206.191.148.9</command>
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><command>ip link set dev tun6to4 up</command>
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><command>ip addr add 3ffe:8280:0:2001::2/64 dev tun6to4</command>
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><command>ip route add 2002:100:333::/64 via 3ffe:8280:0:2001::1</command></programlisting>
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<para>On both systems, restart Shorewall and issue the configuration
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commands as listed above. The systems in both IPv6 subnetworks can now
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talk to each other using IPv6.</para>
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</section>
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</article>
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