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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type"
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content="text/html; charset=windows-1252">
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<title>6to4 Tunnels</title>
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<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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</head>
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<body>
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<h1 style="text-align: center;">6to4 Tunnels<br>
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</h1>
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<h3>The 6to4 tunnel documentation is provided by Eric de Thouars.<br>
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</h3>
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<h3><font color="#ff6633">Warning: </font>The 6to4 tunnel feature of
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Shorewall only facilitates IPv6 over IPv4 tunneling. It does not
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provide any IPv6
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security measures.</h3>
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<p>6to4 tunneling with Shorewall can be used to connect your IPv6
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network to another IPv6 network over an IPv4 infrastructure</p>
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<p>More information on Linux and IPv6 can be found in the <a
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href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO">Linux IPv6 HOWTO</a>.
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Details on how to setup a 6to4 tunnels are described in the section <a
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href="http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/configuring-ipv6to4-tunnels.html">Setup
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of 6to4 tunnels</a>.</p>
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<h2>Connecting two IPv6 Networks</h2>
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<p>Suppose that we have the following situation:</p>
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<p align="center"> <img border="0" src="images/TwoIPv6Nets1.png"
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width="745" height="427" alt=""> </p>
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<p align="left">We want systems in the 2002:100:333::/64 subnetwork to
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be able to communicate with the systems in the 2002:488:999::/64
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network. This is accomplished through use of the /etc/shorewall/tunnels
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file and the "ip" utility for network interface and routing
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configuration.</p>
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<p align="left">Unlike GRE and IPIP tunneling, the
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/etc/shorewall/policy, /etc/shorewall/interfaces and
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/etc/shorewall/zones files are not used. There is no need to declare a
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zone to represent the remote IPv6 network. This
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remote network is not visible on IPv4 interfaces and to iptables. All
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that
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is visible on the IPv4 level is an IPv4 stream which contains IPv6
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traffic. Separate IPv6 interfaces and ip6tables rules need to be
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defined to handle
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this traffic. </p>
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<p align="left">In /etc/shorewall/tunnels on system A, we need the
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following:</p>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse;">
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<tbody>
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<tr>
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<td><b>TYPE</b></td>
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<td><b>ZONE</b></td>
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<td><b>GATEWAY</b></td>
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<td><b>GATEWAY ZONE</b></td>
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</tr>
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<tr>
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<td>6to4</td>
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<td>net</td>
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<td>134.28.54.2</td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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</blockquote>
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<p>This entry in /etc/shorewall/tunnels, opens the firewall so that the
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IPv6 encapsulation protocol (41) will be accepted to/from the remote
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gateway.</p>
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<p>Use the following commands to setup system A:</p>
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<blockquote>
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<p>>ip tunnel add tun6to4 mode sit ttl 254 remote 134.28.54.2<br>
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>ip link set dev tun6to4 up<br>
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>ip addr add 3ffe:8280:0:2001::1/64 dev tun6to4<br>
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>ip route add 2002:488:999::/64 via 3ffe:8280:0:2001::2</p>
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</blockquote>
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<p>Similarly, in /etc/shorewall/tunnels on system B we have:</p>
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<blockquote>
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<table border="2" cellpadding="2" style="border-collapse: collapse;">
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<tbody>
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<tr>
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<td><b>TYPE</b></td>
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<td><b>ZONE</b></td>
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<td><b>GATEWAY</b></td>
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<td><b>GATEWAY ZONE</b></td>
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</tr>
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<tr>
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<td>6to4</td>
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<td>net</td>
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<td>206.191.148.9</td>
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<td> </td>
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</tr>
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</tbody>
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</table>
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</blockquote>
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<p>And use the following commands to setup system B:</p>
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<blockquote>
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<p>>ip tunnel add tun6to4 mode sit ttl 254 remote 206.191.148.9<br>
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>ip link set dev tun6to4 up<br>
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>ip addr add 3ffe:8280:0:2001::2/64 dev tun6to4<br>
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>ip route add 2002:100:333::/64 via 3ffe:8280:0:2001::1</p>
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</blockquote>
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<p>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.</p>
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<p><font size="2">Updated 5/18/2003 - <a href="support.htm">Tom Eastep</a>
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</font></p>
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<p><a href="copyright.htm"><font size="2">Copyright</font> © <font
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size="2">2001, 2002, 2003Thomas M. Eastep and Eric de Thouars.</font></a></p>
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<br>
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<br>
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<br>
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<br>
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</body>
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</html>
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