So we've been having massive DHCP problems, the service just becomes unresponsive until we reboot the server. So the boss has decided to migrate the DHCP to a new Win2012 R2 VM. And he wants to do it today ...
So here's what I have: all Win2008 R2 DC (forest and domain at Win2008 R2 levels) - 7 DCs in total, 3 here at headquarters, 4 out at other sites. We want to migrate DHCP from #2 DC here at HQ. This DC does DNS and DHCP (no FSMO roles). We want to migrate DHCP to the new Win2012 R2 member server. Then we want to decommission the DC entirely, and re-use it's IP address (because all our switches use that IP as DHCP helper addresses). Now, we have "Migrate DHCP Server to Windows Server 2012 R2" doc, and it seems relatively straightforward. Export using the migration tools, import using the migration tools. Here is my concern - because I need to keep the same IP address, I need to decommission the existing DC, so I can re-use it's IP. Where in this process do I do this? Do I: change the IP on the DC *first*; migrate to new Win2012 R2; change it's IP to match the old IP of #2; decommission the old DC entirely and shut it down? I realize that change the IP on the existing DC means that DHCP will break (in the sense that the switches won't be able to do DHCP helping). But I just think that this is easier and safer. Thoughts?
