Problems with two domain controllers on the same subnet
Posted on 2011-03-25
We are lighting up a new domain controller in the same subnet as the existing one. The existing one is windows 2000 and the new one is windows 2008 std. Since there is no migration path and exchange is not involved we are doing a detach and re-attach.
DHCP is provided by domainA and the router is a sonicwall (not using DHCP).
The old server's domain is "domainA" and the new one is "domainA.local".
It's not our normal practice to use the same name in a server upgrade so we know that we should have used "domainB.local"
the problem we're having is that when we shut down DHCP on domainA and bring it up on domainB (same scope) and domainB's DHCP service has DNS for both controllers- clients still on domainA that haven't been cut-over can't login.
From what I have read, domainA is different from domainA.local. Can anyone confirm this? I'm trying to rule out some kind of AD name conflict and focus on DHCP/DNS issues, or is the problem actually that the names are not unique.