How to Configure IPv6 Over IPv4 Tunnels

1. Become superuser.

2. Create the file /etc/hostname6.ip.tunn (where n is 0, 1, 2, and so on) and add entries using the following steps.

   1. Add the tunnel source and tunnel destination addresses.

      tsrc IPv4-source-addr tdst IPv4-destination-addr up

   2. (Optional) Add a logical interface for the source and destination IPv6 addresses.

      addif IPv6-source-address IPv6-destination-address up

      Omit this step if you want the address autoconfigured for this interface. You do not need to configure link-local addresses for your tunnel because they are automatically configured.

When you finish configuring the tunnels, you must reboot.

You must perform the same steps at the other end of the tunnel for bidirectional communication to occur.

If your system is to be configured as a router, you must also configure your router to advertise over tunneling interfaces before rebooting (see "How to Configure Your Router to Advertise Over Tunneling Interfaces").

Example--IPv6 Configuration File Entry to Autoconfigure IPv6 Addresses

This is an example of a tunnel for which all IPv6 addresses are autoconfigured.

tsrc 129.146.86.138 tdst 192.168.7.19 up

Example--IPv6 Configuration File Entry for Manually Configured Addresses

This is an example of a tunnel for which global and site local source and destination addresses are manually configured.

tsrc 120.46.86.138 tdst 190.68.7.19 up
addif fec0::1234:a00:fe12:528 fec0::5678:a00:20ff:fe12:1234 up
addif 2::1234:a00:fe12:528 2::5678:a00:20ff:fe12:1234 up