Can't use 1.1.1.1

I can’t use 1.1.1.1 as DNS any more (for two weeks, aprox) from my ISP network [I’m the ISP :slight_smile:]

Traceroute is fine, ping is fine; 1.0.0.1 works; I’ve double-checked everything but can’t find anything in my routing/firewall that would stop DNS requests to-from 1.1.1.1…

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, 1.1.1.1 works fine]

Any help for me ?

Thanks!
Dejan J.

https://dnsviz.net/d/sokowireless.net/dnssec/

It is (or was) not unusual for 1.1.1.1 to be used internally in some networks and on some equipment. There is even a blog post about this.

Do the traceroutes to 1.1.1.1 and 1.0.0.1 look the same length, and do they leave the ISPs network?

You can also visit https://cloudflare-dns.com/help and see what the test results look like.

Very strange - traceroute is not the same to 1.1.1.1 and 1.0.0.1 … from cloudflare…/help I can see that I don’t have DNS connectivity to 1.1.1.1 (which I’ve found out already) …

Since it’s probably an error at my ISP (high level, state-owned, telco.) there’s nothing I can do about it, right?

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