Posts Tagged ‘6to4’


For Part 1 of this series, click here. For Part 2 of this series, click here.

6to4 tunnels allow for the dynamic creation of IPv6 within IPv4 tunnels. While the previous two tunnel mechanisms we examined were point-to-point type structures, this tunneling approach is considered a dynamic point-to-multipoint type. Since it is dynamic tunnel, we are going to do the very strange step of NOT assigning a tunnel destination as you will see.

6to4 tunnels rely on reserved address space. The reserved prefix is 2002::/16 (Core Knowledge Alert!). To this prefix, the IPv4 address of the border router is added, resulting in a /48 prefix. For example, if the border router possesses an external IPv4 address of, the resulting 6to4 site address space becomes 2002:c000:0201::/48. Keep in mind that this site will utilize this address space in its whole network, but hosts inside the network do not need to support the 6to4 technology.

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