We are facing query drops by using dnsperf tool from ISC testing the DNS service via load balancer. Multiple queries from the same source port are being dropped partially by the load balancer and as per the load balancer vendor feed back, this is a security feature and this situation doesn't happen in real life scenarios.

Most of the cases, clients are generating unique random source ports for each DNS query, however we are not sure about the option of reusing the same source port for multiple queries and how does it apply in real life scenarios.

Appreciate your comment on this subject.

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Abdulla Ahmad Bushlaibi

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