DNS over HTTPS - how to

For LAN forcing use of local (on Ipfire) DNS and blocing access to outside port 53 can be simply done, but how to create DOH DNS server on ipfire and block DOH queries to outside?

There is no DOH option in IPfire.
Some of the block lists or IPS I think have a DOH block list. This can be tricky.
It will block all requests from that IP.

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