DO is responding to DNS queries on my IP?

I’ve stumbled into a strange situation where, querying my droplets on their public IP, I am getting a response even when no DNS server is running and the firewall is configured to drop packets on port 53.

Further, when I am running DNS on a droplet, everything works as expected when querying against the VPN or local interface of the droplet but querying it’s public IP, the response is not as expected and appears to be coming from another server on my servers behalf.

What gives? How do I stop this?

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Can you clarify what queries exactly are you running? As DNS stands for Domain Name System and is responsible for resolving domain names, so if you try to query your IP address, this does not go over DNS as there is no name to be resolved.

If you want to not allow ping for a specific IP, you can block ICMP traffic via your firewall.

Regards, Bobby