Active directly is tied fairly closely to it's DNS. For example, if a client needs to find a Domain Controller, it does a DNS 'SRV' query for (I think, I'm doing this from memory) '_LDAP._TCP.domain.com/org/net/whatever'. I assume other 'services' like LDAP are 'advertised' (if you can call it that) via DNS as well. You MAY be able to duplicate all the records in BIND, but expect random things to not work, and have to do a bunch of research figuring out what DNS query it's doing, and what the proper answer is. Ken Matlock Network Analyst Exempla Healthcare (303) 467-4671 matlockk@exempla.org -----Original Message----- From: Tom Mikelson [mailto:tmikelson@gmail.com] Sent: Monday, September 20, 2010 8:05 AM To: nanog@nanog.org Subject: Active Directory requires Microsoft DNS? Presently our organization utilizes BIND for DNS services, with the Networking team administering. We are now being told by the Systems team that they will be responsible for DNS services and that it will be changed over to the Microsoft DNS service run on domain controllers. The reason given is that the Active Directory implementation requires the Microsoft DNS service and dynamic DNS. Not being a Microsoft administrator I do not know the veracity of these claims. Anyone out there had any experiences with a situation like this? I am a bit leery of changing something that is already working.