http://blogs.technet.com/rrasblog/archive/2007/01/23/broadband-connections-and-dhcpv6-prefix-delegation-in-windows-vista.aspxSome Microsoft customers and partners have enquired about the support for Requesting-Router behaviour of DHCPv6 Prefix Delegation in Windows Vista. I have also seen attempts by some vendors to use prefix delegation to assign IPv6 addresses to Broadband/PPPoEen-USCommunityServer 2.1 SP1 (Build: 61025.2)