I have done a bunch of testing and NetworkManager does not send the client-host's name to the server so that an IPv6 dns entry can occur. I have dupicated the problem with dnsmasq and bind/dhcp. This has been reported: https://bugzilla.redhat.com/show_bug.cgi?id=858327 Now back to figuring out how to get IPv6 dhcp support into libvirt. Gene