@TP-Link This is how it was setup, the servers I had were 1.1.1.1 8.8.8.8 So I don't think this is the issue. What is the dnsproxy service doing on your devices? Does it do a MiTM for dns? TP-Link...

@TP-Link I am using Router mode, since we want to use the QOS etc Here it is the diagram: Is this not related to a process that runs on your router called dnsproxy?

Something very strange is happening with DNS when using Deco M4R network. Using dig connected directly to the my isp router ( bypassing Deco M4 ) I get: dig www.youtube.com @8.8.8.8 ; <<>> DiG 9.10.6...