On 26.08.25 14:57, Stephane Bortzmeyer wrote:
On Tue, Aug 26, 2025 at 02:52:21PM +0200,
Winfried via dnsdist <dnsdist@mailman.powerdns.com> wrote
a message of 25 lines which said:
topQueries(30)
1 . 7906 39.5%
Which is probably not normal.
"." is not on the topQueries() list on a very busy dnsdist (Resolver
loadbalancer) here. Is it possibly a (dnsdist) health-check?
Probably not since it is sent to the backend (I can see it by snooping
the link between dnsdist and the backend). Which is strange since, at
least, dnsdist should serve it from its cache.
We see many queries for google.com containing opcode 2 (status), which
are dropped by Recursor. Maybe the ". NS" queries you see has also a
wrong opcode or something else and are dropped by the backend as well?
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