BIND 9 isn’t setup to log these. They will fall under the stats counter 
mismatch but that also captures (some) duplicate responses and late responses.
This filters out is/address pairs that named is not expecting. The question 
section is tested later. 

Dig will report these so you can test servers that you believe are broken. 
-- 
Mark Andrews

> On 2 Sep 2020, at 05:25, Andreas Ott <[email protected]> wrote:
> 
> 
> 
> 
>> On Mon, Aug 31, 2020 at 8:00 PM P Vixie <[email protected]> wrote:
>> [...] the observation that something
>> bad is not happening to somebody doesn't mean it's not happening to anybody.
> 
> May I please ask an operational question to experts: though I am only running 
> a small number of authoritative and recursive servers, I am coming up short 
> looking up what logging I need to turn on in BIND 9.16 and what logged 
> strings I need to parse out to see responses coming from a different IP? I 
> have various log channels enabled per the BIND logging "FAQ" but either I am 
> missing config bits or the problem does not occur (on my servers). This is in 
> a network lab setup and I am able to share data.
> 
> Thanks, andreas
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