Ciaran Johnston writes:
[...]
> correct me here ... do DNS servers cache the non-existence of a record?
Yes - the last field in the SOA RR ("Negative caching TTL"). If the server
is running bind, there is also the "max-ncache-ttl" configuration option.
The nTTL value should be in the order of several minutes, but some older
zone files might still use larger values; before bind 8.2.3, this field
held the "general" TTL which applied to all resource records, and it may
not have been updated along with bind.
If the SOA is the culprit here should be easy to find out
dig @server domain soa
In general, it is recommended to post the real domain names and IP addresses
in question. If the host/domain is Internet-facing, there is little value
in keeping it secret anyway.
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