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From ClueWiki

6to4 is a technology by which your computer can automatically find a close router to relay packets. It is often faster than tunnel brokers. You also get a very large subnet, a /48, beginning with the 2002: prefix followed by your IPv4 IP (in hex). This is how most existing Cluenet networks get their IPv6 connectivity. To use 6to4, you must have a machine with a public IPv4 IP or a router that forwards protocol 42 to it. Some hardware routers running special firmware can also use 6to4.

There are many existing tutorials on the Internet. Below are some good links:

• DD-WRT IPv6 tutorial - 6to4 Setup on a dd-wrt router.
• Linux IPv6 HOWTO - A good Linux IPv6 6to4 tutorial.
• 6to4reverse form - Get rDNS on your 6to4 connection.