Cloudflare DNS blocked by Airtel?

[Kazuma]

I just received my Static IP details from Airtel.
Here's how I configured it on my Dasan Router.
Removed PPPoE from WAN Index 0.
IPv4 only.
IP- 122.x.y.z
Subnet Mask-255.255.255.0
Gateway-122.x.y.1
VLAN ID-100
MTU-1500

They didn't provide me with Primary DNS details, so I set up Google DNS, 8.8.8.8 and 8.8.4.4 and that worked flawlessly. I wanted to see the performance on Cloudflare DNS, 1.1.1.1 but it didn't resolve any DNS queries. The internet stopped working entirely. I tried Quad9 and NextDNS, and they work fine.

Is Airtel Blocking Cloudflare DNS 1.1.1.1 and 1.0.0.1 on their Static IPs? Can anyone check with both primary and secondary DNS set as Cloudflare in the router?

 

[anmolbhard004]

working fine here buddy.

 

[Smh]

Airtel is not blocking CF DNS.

Can u ping them?

 

[Smallship]

They don't block the DNS here, but the peering with Cloudflare in general is bad and the pings are absurd.

 

[Kazuma]

Do you guys have it installed on a Static IP, in the router itself? I mean it could be the router itself blocking certain DNS, it's the airtel provided Dasan. I tried to install Cloudflare again and it doesn't work, I cannot connect to the internet. Switching back to NextDNS, Quad9 or Google DNS, they all work.