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How to mitigate named UDP spoofing?

cn flag

How can named be configured to require TCP for updates and log that TCP was used?

eg:

Jul  6 11:01:28 server named[865]: client @0x7f89200aa3d0 1.2.3.4#58841: update 'domain.tld/IN' denied

should end in T or U

like for queries https://kb.isc.org/docs/aa-00434

... I'm looking for mitigations for a naive standard.

https://en.wikipedia.org/wiki/Reverse-path_forwarding#Unicast_RPF

I sit in a Tesla and translated this thread with Ai:

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