> 6to4 prefixes more specific than 2002::/16 are allowed to be
> propagated in native IPv6 routing, as long as the more specific
> matchs exactly the mapped most aggregated IPv4 route originated by
> the same AS.
This is a really, really bad idea, for the reason given in RFC3056:
6to4 prefixes more specific than 2002::/16 must not be propagated
in native IPv6 routing, to prevent pollution of the IPv6 routing
table by elements of the IPv4 routing table.
That is a much more important issue than the fact that 6to4 doesn't work
well for users whose ISPs haven't deployed a 6to4 relay (and announced 2002::/16
locally). ISPs do need to pay attention to filtering rules for 2002::/16
announcements.
Brian
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