difference in responses between UDP and TCP
Arun Natarajan
arun at arunns.com
Sun Jun 18 10:11:34 UTC 2017
Hello Anand,
Thanks for the response.
>
> Perhaps the zone got updated between your queries.
>
> Have you (as one should in a proper experiment) repeated these queries
> to demonstrate that this is happening consistently?
>
Yes, it is a consistent behaviour. It happens with some of our secondaries.
for example:
dig +tcp @212.26.18.3 pub.sa
serial: 2017061804
dig +notcp @212.26.18.3 pub.sa
serial: 2017061805
> If it is happening consistently, then it's possible that you have *two*
> DNS servers listening on the server, one on the UDP socket, and another
> on the TCP socket, and they're loaded with different zones.
>
To my understanding, they are running bind with one configuration. Will
double check anyway.
thanks,
arun
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