@wvkreg Your router does not support setting a LAN dns. Set your Router's DNS away from your Pi-hole, or it will keep hammering it with requests. You will need to disable DHCP on your router before your Pi-hole can serve as the DHCP server.
To disable DHCP on your router :
On the basic homepage:
Select ADVANCED > Setup > LAN Setup .
Clear the Use Router as DHCP Server check box. & Click the Apply button.
This will set ONLY your router to use the external DNS address (once you set your Pi-hole as your DHCP server, your devices will use your Pi-hole for their DNS queries):
On the basic homepage
Select Internet, Scroll down to Domain Name Server (DNS) and click Get Dynamically from ISP & Click the Apply Button.
To set your pihole as your active DHCP server, follow these directions.