http://blogs.technet.com/ipv6/archive/2008/01/24/understanding-ipv6-second-edition.aspxJoe Davies, a.k.a. "The Cable Guy", has completed the update to his excellent "Understanding IPv6" book! I highly recommend this book - it will help you understand IPv6 in general as well as some Microsoft-specific information. Good stuff! Understandingen-USCommunityServer 2.1 SP1 (Build: 61025.2)