-
Not a network person either but presumably your other/old DHCP server is no longer acting as one? And what length of time was the DHCP server providing IPs for? Usually lease is renewed after 24hrs, but not sure what'd happen if lease time was set to 0 (i.e. forever) on the old DHCP server?
Have you restarted the devices after setting pihole as only DHCP server on the network? I'm guessing gateway IP is set correctly too on the pihole?
Anyone had problems with DHCP PiHole failing to allocate IP addresses? I'm not a network person and PiHole annoyingly closes tickets after 21 days if no one comments on them preventing any fixes being written down