My router's ethernet no longer works! It had been fine and then nothing was connected, no clients no Internet. The WiFi is working just fine. The router has been cycled, reset and reconfigured....

I am trying to change my DNS settings to an internal address for a PiHole I have running. The router accepts the new address and then changes its address from 192.168.0.1 to 192.168.1.1. How do I...