Please follow the below template, it will help us to help you!
DNS server resolves domains correctly
DNS server incorrectly resolves domains to 10.0.0.1 intermittently. Happens often for periods of up to 5-10 minutes.
22.214.171.124 resolving doubleclick.com to 10.0.0.1 [l43d2wdhe4]
126.96.36.199 resolving doubleclick.com to 188.8.131.52 [h19j4v04bq]
My set up
I have two Asus routers, one is pppoe WAN and the other is in bridge mode. Both have DHCP disabled and the former has WAN > automatic DNS settings disabled and I have pointed it instead to the pi. DHCP and DNS server is enabled on the pi.
I have made 2 logs (tokens pasted above) that show the behaviour. Occasionally the upstream DNS (in my case google) will resolve requests to 10.0.0.1 for some reason which is obviously incorrect. Why is this happening? I doubt google’s DNS is actually replying with that?