It is easiest if you run AD integrated dns.
How to convert dns primart to AD integrated:
For dns on each of your dc's make sure you point to itself as well as the
other dc for dns services. We point to itself and then a secondary but there
are reasons for a secondary first. Read the link on Best practices and you
For each client in your AD Domain, they need to be aware of multiple dns
servers in the even one fails. In the best prctice above it will explain
that you need to make sure that w/o this your clients won't be able to logon,
so be sure to include this in your clients ip config settings.
MVP - Directory Services
MCTS, MCT, MCSE, MCSA, Security+, BS CSci
2008, 2003, 2000 (Early Achiever), NT4
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