> Since there are no features that cannot be had with IPv4 this only

Scalable interdomain multicast? Think of the MSDP-mess in IPv4 vs embedded 
RP in IPv6. I know, I know, this won't drive IPv6 deployment, but just for 
the record, this is something solved with v6 and missing with v4. Maybe 
it'll be interesting sometime.

Andras

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