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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