i suggest ietf.org mail server to operate in IPv6 only.
6to4 is now widely deployed
Is it? Can you cite any data?
- Apple MacOS X implements it. i'm not sure which release started
shipping it, but if it was from 10.2, there are 22 million copies
around, with IPv6 enabled by default.
- Apple AirPort Exterme implements it.
The /48 prefix length is not just some knob that RIRs or ISPs can turn
at their will. It's a constant that's embedded into 6to4 protocol
implementations in tens or hundreds of millions of computers.
Give me a break. Use leading zeros for the first 8 bits of the subnet
part and everything else still works just fine.
so if you are running 6to4 enterprise (/48) and then get some prefix
from ISP/RIR which is like /56, you would have to renumber entire
subnet portion to fit into 8 bits, from 16 bits. imagine how
painful it is, and imagine how it will constrain people from
exiting from 6to4 addresses to real IPv6 addresses.
itojun
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