Issue with cache
Matus UHLAR - fantomas
uhlar at fantomas.sk
Tue Nov 22 07:59:25 UTC 2011
On 22.11.11 12:58, Binu B Nair wrote:
>I am facing a very strange problem.
>On sending a DNS query for sabbia0 at direct.telstra.net I do not get a
> DNS response from the resolver. It shows a SERVEFAIL error.
maybe because it's not valid domain name, because of the "@" character.
>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:
I don't even see "direct.telstra.net" from here. Are you a telstra.net
customer? maybe it has broken NS records, and they are only visible
from their network...
>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?
Maybe it's not caching thge response, but unable to find the name.
>Is it a bind characteristics to store all responses - positive and negative?
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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