How to optimize dns requests

[Matus UHLAR - fantomas]

On 15.03.13 15:25, Abdellatif ... wrote:
>I want to optimize the call to remote dns server to resolve domain names
> each time needed. What i want to do is that if the hostname is
>requested for the first time than call the remote dns (for example
>8.8.8.8) to resolve it, once called then recorded for later use in such
>way when next time the seem domain name is requested for resolve than
>the cached ip is grabbed without need to call remote dns to maximize
>speed to optimize network traffic.

This is how BIND normally works.

>It doesn't seem to use the cache, here is the call of dig mail.com :
>
>; <<>> DiG 9.8.1-P1 <<>> mail.com
[...]
>;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

this is clearly a cached answer (aa flag is missing). How did you come to
the conclusion that caching does not work?

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