Google DNS appearing as a resolver when connected to the Sydney, AU AGDNS server

[ghost]

I currently have the ability to test this on the Sydney, AU and the LA, US AGDNS due to a routing issue between my mobile connection and home VDSL connection.

When connected via the SN, AU AGDNS server additional Google DNS resolvers are appearing on dnscheck.tools. There's also Cloudflare appearing, but that could possibly be from iOS's Limit IP Address Tracking feature.

When connected to the LA, US AGDNS server, I don't experience the additional Google DNS resolvers.

@ameshkov mentioned this in the Telegram group chat, but I wanted to determine whether that was happening here, or it's something else.

Connected to SN, AU AGDNS server

Connected to LA, US AGDNS server

[ameshkov]

Yes, that's the same reason. I am not sure btw why it does not behave like that on every locations.

dnscheck.tools triggers lots of different DNS queries that fail due to a DNSSEC error and records from which IP addresses the queries were sent. AG DNS unfortunately is not able to distinguish network errors and DNSSEC errors so in both cases it tries to use a fallback.

Ideally, we should only try to use a fallback in the case of a network issue, but I don't see any technical capability at the moment unfortunately.