EDNS Client-Subnet (ECS) not working
This blog post implies that NextDNS supports ECS:
But then why isn't this test working?
> dig o-o.myaddr.google.com txt @184.108.40.206 ;; ANSWER SECTION: o-o.myaddr.google.com. 60 IN TXT "220.127.116.11"
Compare with a test using Google's DNS which supports ECS:
> dig o-o.myaddr.google.com txt @18.104.22.168 ;; ANSWER SECTION: o-o.myaddr.google.com. 60 IN TXT "22.214.171.124" o-o.myaddr.google.com. 60 IN TXT "edns0-client-subnet 126.96.36.199/24"
Observe the missing edns0-client-subnet in the reply when using NextDNS, which makes me think that NextDNS servers do not send ECS.
Do you need to add o-o.myaddr.google.com to the ECS allow list on your side to make the test work?