I have a pair of Windows Server 2012 R2 DHCP servers in HA that suffers the infamous error "duplicates A BINDING-ACK message with transaction id: xxxxxx was received for IP address: x.x.x.x with reject reason: (Fatal conflict exists: address in use by other client ) from partner server:" I ran Invoke-DhcpServerv4FailoverReplication but it still produces many BINDINK-ACK errors. So I stopped the second DHCP server in order for clients to obtain stable IP leases. Now I am planning on bringing the HA back. My understanding is I can:
bring the second DHCP server online
Remove the failover relationship
Re-establish the failover relationship
Hopefully it can sync the servers again. However, I am curious what happens after I've removed the failover relationship. Will both servers keep their own set of active leases (the second DHCP server apparently has invalid leases since it was offline)? It seems I need to manually remove all the scopes from the second DHCP server that was offline before.
If I re-create the failover relationship from the first DHCP server shortly after the removal of relationship, will the second DHCP server sync up with the first DHCP server's active leases? How does it know whether to sync from server A to server B or vice versa if I don't remove the scopes on the second DHCP server?
Thanks.