Using the anycast addresses usually adds so much latency that it results in large parts of the IPv6 internet not being accessible. Hopefully we'll get a local 6to4 gateway anycast reachable in the near future. -----Original Message----- ... I've not played with vista directly, but I have experimented with 6to4 and Teredo. Both are reliant on decent anycast gateways, which would be fairly easy for ISP's to deploy within their networks. Which gateway we see from New Zealand often varies but it's not unusual for it to be in Europe somewhere which is likely to cause excessive latency increases to native IPv6 sites. Of course 6to4 to 6to4 and teredo to teredo routes follow the same route as the IPv4 Internet, and the overhead is precisely 20 bytes per packet.