fine... we can move the functionality to the NAT... close to the edge but not all the way to the hosts.
happy now?
only if you turn the NAT into something that doesn't do address translation for v6.
actually I think we'll end up with something like this in the best scenarios - border router will do NAT for IPv4, routing w/o translation for v6, security for both. whether that router tries to finesse multihoming for v6 is an open question.
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