I have been experiencing an odd fault on my Windows 7 & 10 clients in the last couple of days with their IP4 addresses. For no reason that I can see clients are randomly not receiving a default gateway address despite one being set for them in the DHCP server settings.
We have found by trial and error that the address will appear if we physically unplug the network cable and restart it, rest the switch it is connected to, or delete its DHCP lease and associated DNS record and restart it. However, the same machine can drop the IP address 24 hours later.
We have 2 DHCP servers in fail over configuration (Windows 2012 R2). We have stopped and restarted the DHCP server service on both servers and restarted them. I have tried disabling the service on each server for a period of time, but it makes no difference. The event log for both these services reports no errors. Both servers are virtual. I cannot currently re-install the services on both servers. Has anyone seen this odd behavior before?