Tek Bahadur Limbu wrote:
[ ... ]
Thank you very much for your help and suggestions. Actually, the reason
why I want to implement this restriction is because some clients whose
Windows PCs are infected with viruses and malwares send up to 10-20
bogus DNS queries per second which causes the traffic utilization to go
almost 5 times high on the dns server.
There are legitimate reasons why a client machine might want to make dozens or
even hundreds of DNS lookups per second-- or have you never used adns or
another webserver logfile analyzer yourself? :-)
Please consider solving the problem rather than a symptom.
If you experience what you determine to be malicious traffic from a host or
traffic which violates your published AUP, please contact the systems' owner
or perform firewall egress filtering on such a machine until it gets fixed.
--
-Chuck
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