So I did a 2003 to 2008 R2 migration of our DHCP this weekend. Today it seems as though anyone not in the same network as our DHCP server is NOT getting an address - they pull an IPIPA address instead.
DHCP is in 10.1.1.x network
Clients in 10.1.x.x networks don't pull address
My migration path that I followed was very straight-forward. Basically a backup of existing and imported in to 2008. No IPs on the servers have been changed so my DHCP now resides at a different address than it did before the migration as I still have shares on that old 2003 box that I have yet to move. (I know some instructions recommend you add the old IP as a secondary address on the new server)
I have verified that the new scopes are all active. The old DHCP server has been de-authorized and the DHCP service on that box has been DISABLED.
Any thoughts? The majority of my currently leased addresses are due to expire in about 8 hours.