I've asked this question before but I couple of specific questions:
Environment - 2 AD servers 2008 NON R2 32bit and 1 2008 R2 64bit. The server with all the FSMO roles is 2008 NON R2. We want to upgrade this server along with the secondary AD server. Both these NON R2 servers are setup as DNS. Primary and secondary DNS accordingly on all workstations. Primary is Virtual, the secondary is physical. Because I am going from 32-bit to 64bit i know I can't do in place upgrade. I can upgrade the secondary physical easy enough (demote, setup new server 2008R2, dcpromote).
My question is I am wanting to keep the same IP addresses and names for both servers. Several devices have DNS hardcoded and we don't know at loose connection. Is it possible to bring up both these servers with the same IP address and name? What about the server with the FSMO roles? What is the best practice on upgrading it to server 2008R2 and keeping the same IP address and name? If I change IP address and server name after I promote to AD does it break anything?
I had originally setup the third AD server 2008R2 to hold the FSMO roles temporarily while I upgraded the current AD with FSMO roles and then transfer roles back. But now i think that is too much moving around of things.
Any guidance is appreciated.