I can’t use 184.108.40.206 as DNS any more (for two weeks, aprox) from my ISP network [I’m the ISP ]
Traceroute is fine, ping is fine; 220.127.116.11 works; I’ve double-checked everything but can’t find anything in my routing/firewall that would stop DNS requests to-from 18.104.22.168…
I doubt my upstream ISP (Telekom Serbia) is blocking the request but I don’t know how to check that. [using the backup link, thru another provider, 22.214.171.124 works fine]
Any help for me ?