> Except for NATs, but NATs will disappear with the very near exhaustion of IPv4 addresses
> and the pressure of P2P applications.
No they won't. Did you see the PR disaster Apple had when the Airport Express supported IPv6
without NAT? Everyone suddenly went "OMG my internal network is all exposed to the internet now,
giant security hole!!!". And of course, they were right -- that is unexpected behavior in today's
world. So, no doubt about it, NAT will live on even with IPv6. (When I say NAT there, I really mean
connection-tracking-based filtering: tacking the address translation on is trivial to do or not, but
it's the connection-tracking which would cause problems with SCTP).