IPv6 is a subject, that really get-s me mad for over 10 years now.
Pushing IPv6, getting rid of NAT that would be really great.
Will it happen? I doubt it for many years to come.
I even start to doubt 'evolution' as a mechanism in nature, since CIOs/roots/admins all are too comfortable with a NAT/FW-type of 'lame-duck'-construction of their networks. And the ISPs and Telcos, while using IPv6 internally, don-t really propagate it.
I know numerous stories of troubles/problems and countless man-hours, dealing with traffic-problems. Yet, I write this on a LAN-pc behind NAT/FW. Sharing one ISP-address with 200+ others. I assure you. Bittorrents are finding their way through, no matter what.
So does maleware...
Still I don-t like the (typical) Microsoft-idea to host the "Teredo"-Servers, which is another word for 'Trackers' and logging all traffic that goes through. I know, I know, but that-s typical for you: good intentions - bad execution.
It is also funny to see one dev-department trying to make Vista as secure as possible, while the other dev tries to find ways to break it, to allow communication. Hen and egg-dilemma, all over again. Unsolvable IMHO.