By default, Active Directory does not require the use of reverse lookup zones to validate clients. The primary function of AD DNS is to permit the lookup of clients, services, and the all-valuable DC GUIDs for inter-DC communication. Spiffy. However, it appears that not everybody likes this. Now, I will be the first to admit that I don't read all of the RFCs for a given protocol or spec. OK, I will also admit that I like to lie about reading anything regarding RFCs, and in fact have better luck reading