I have IPv6 autoconfiguration configured on my router which also supplies IPv6 name servers. This works fine on my Windows 7 box (I get both IPv4 & IPv6 nameservers) but I only see IPv4 server in /etc/resolv.conf on my 12.04 Ubuntu box. I get assigned IPv6 addressing just no IPv6 name servers.

When I try:

dhclient -6 eth0 (Or br0) it just hangs

When I look at a network trace I see DHCP-SOLICIT and DHCP-ADVERTISE repeated over and over until I control-C

I can see the DNS name server in the Advertise. Any ideas?