20 Feb
2007
20 Feb
'07
7:41 a.m.
The comment about 6to4 only being enabled on Vista if there's no NAT in the path is interesting. How does Vista know if you're behind a NAT? Does it do active probes, or does it just assume that everything behind a NAT must be numbered in RFC1918 space?
It does probes to a Teredo server I believe. 6to4 only works if you know your realworld address, and only one box behind NAT can recieve protocol 41 packets (there are no port numbers), which is why I believe vista isn't using 6to4 if you're behind NAT.