How to setup a backup DNS server
I currently have my DNS server set to 'Manual' and points to the IP address of my local PiHole server (Set under Settings > Wired Networks > LAN > DNS Server). The PiHole server has gone down before and all my DNS resolution started to fail.
How can I set it up so that: if the PiHole server fails to respond to DNS requests, automatically fail over to Cloudflare DNS (1.1.1.1)?
There are two input boxes for IP address in under "DNS Server", but if I put my PiHole IP in the first box, and Cloudflare DNS in the second, it does not switch to the Cloudflare DNS if the PiHole fails.