Hi,
We have started having a very strange situation with our DHCP server. We run DHCP on Windows Server 2003 and have several scopes for data and voice (your typical setup really).
Recently a couple PC's and phones where moved (physically) from one floor (scope) to another and when booted up wouldn't connect to the network unless we gave them static IP's. However, when we removed the static credentials and took it back to the original floor (and original scope) the machine worked fine.
We've tried a couple fixes (as follows):
1. removing all DHCP and DNS records of the machine on the servers, IPConfig /Release > /FlushDNS > /Renew on the client machine, moved it to another location on the same floor (scope)
2. Changed the cables, wall ports, ports on the same switch, moved it to a different switch, and different scope.
3. Reconciled all scopes and Rebooted DHCP Server
4. Rebooted an forced connection to specific DNS server.
5. We even tried releasing credentials from a working machine, giving the none working machine those credentials as a static and renewing on the new machine. That machine received new credentials, but when we then released the static details from the none working machine and set to automatic settings it failed (returned an APIPA address).
It is possible that the same scopes where enabled on a 2012 DHCP Server then removed, I don't know what effect this would have, and I dunno how I would check this.
Any help would be appreciated, other ideas on what to check, info on what happens with regards to a 2 DHCP's with the same Scopes (a WINS2003 and a WINS2012 server). If anyone needs any further information in order to help I will gladly provide it.
Sorry for the long and whining request for help.
Rob D