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 @ pub.sa
serial: 2017061804
dig +notcp @ 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.

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