I recently tested the IPv6 capabilites in a dual stacked network enwironment where there is a Debian Linux box running as IPv6 router with a "radvd" with the following configuration: $ cat /etc/radvd.conf interface eth0 { AdvSendAdvert on; prefix 2001:db8:2f7:55e::/64 { }; RDNSS 2001:db8:2f7:55c:204:76ff:fe2d:79ed { }; route ::/0 { }; }; In this way, the DNS servers are provided as described in RFC 6106. The Windows 7 box configures the IPv6 address with standard gateway correctly, i.e. naked "ping -6 2001:db8:..." commands work fine but it ignores the DNS servers so Windows is able to resolve host names over the IPv4 part only. With manually configured DNS servers the full IPv6 connectivity works. Question: Does Windows 7/Vista support RFC 6106 style DNS assignement or do I have to use DHCPv6 for autoconfiguring the IPv6 DNS servers?