Differences between a 6RD tunnel and a 6to4 tunnel

The 6RD tunneling is an improvement of the original 6to4 solution. The difference is as follows: The address defined by the 6to4 uses well-known prefix 2002::/16, while the 6RD address prefix can be obtained from the IPv6 address space allocated by carriers. Different carriers can use different prefixes to deploy 6RD tunnels. In this way, network planning becomes flexible. The 6RD tunneling is the most widely used IPv6 over IPv4 tunneling technology.

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