Thanks. So far this is not working. The Actiontec C3000A router does appear to allow you to put in a primary and secondary DNS under WAN and DHCP. I have tried it both ways and totally killed my Internet each time. A funny observation was that the router's device table assigns a different IP address to my RPi than the PiHole admin console lists under IPV4 Addressing. Perhaps that's an issue. I will continue investigating and post my solution if I can find one. Otherwise, PiHole has to wait until I get new equipment. If I was able to upload it successfully, here is a screenshot of the DHCP screen under LAN, unchanged from Centurylink defaults.
