Issue with cache

[Binu B Nair]

Hello,

I am facing a very strange problem.
On sending a DNS query for sabbia0 at direct.telstra.net<mailto:sabbia0 at direct.telstra.net> I do not get a DNS response from the resolver. It shows a SERVEFAIL error.
However on flushing the cache, this error subsides and the DNS look up is working fine. As per the initial analysis this is my finding:


1.       DNS lookup for the hostname was getting responded from the cache

2.       On restarting named the cache got cleared



In case 1 can anyone please advise why the resolver was caching a "serverfail" response? Is it a bind characteristics to store all responses - positive and negative?

Please advise.


Kind Regards,
Binu.

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