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Hi Gavin,
On 11/27/25 16:37, Gavin McCullagh wrote:
I think it's evident that these DNS servers are likely not e.g. BIND but I don't quite
understand why we'd say the behavior is "invalid".
The DNS protocol, as I understand it, accepts that zone files may change at any
moment and caches will catch up as ttls expire. That the zone file changed
between the queries you made would explain your observations, right?
Of course. I think the issue here is that the reproducible switching between
existence and non-existence, while there is a also caching, is very unlikely to
be the result the zone maintainer had in mind.
It's not "invalid", protocol-wise, but it's probably "wrong" anyway (in the bug
sense).
Best,
Peter
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