this post was submitted on 18 Apr 2024
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Privacy
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I was making a quick check, and yes, the DoH situation is a bit more dicey. From how I see it, the best way to make this work is to, at the firewall level, either block as much as possible any requests that look like DoH (and hope whatever was using that falls back to regular DNS calls) or setup a local DoH server to resolve those queries (although I am not sure if it is possible to fully redirect those). In that sense, pihole can't really do much against DoH on its own
EDIT: decided to look a bit further on the router level, and for pfsense at least this is one way to do this recipe for DNS block and redirect
Right, so flowing that link there are three ways for DNS:
Classic on port 53,
Dns over TLS on port 853
Dns over https.
The first two can be blocked, because they have specific ports exclusively assigned to them. DoH can't be blocked reliably, because it is encrypted and on a common port. Though blocking 443 on common DNS resolvers can force some clients to fall back to one of the variants that can be blocked/redirected