Re: Issue with cache

[Matus UHLAR - fantomas]

On 22.11.11 12:58, Binu B Nair wrote:

I am facing a very strange problem.


On sending a DNS query for sabb...@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?


yes.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
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Issue with cache

[Binu B Nair]

Hello,

I am facing a very strange problem.
On sending a DNS query for 
sabb...@direct.telstra.netmailto:sabb...@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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