caching name sever ?

[Brad Knowles]

At 1:07 PM +0200 2005-09-13, Brent Clark wrote:

>  The question I would like to know is, how long will a domain record remain
>  in a cache,

	When the owner puts that information into the DNS, they also 
specify how long that information may be cached.  Your server won't 
keep it any longer than they specified.  If they specified five 
minutes, your server will keep it no longer than five minutes.  If 
they specified zero seconds, your server will never cache that 
information.

>              and if its for a short time period, can I extend the time
>  frame that an the records exist in the cache.

	You can't.

>  Also, where is the cache. I have got this funny feeling that it all sit
>  in memory of the machine.

	Yup.  Only in memory.  You could dump it to disk, so that you can 
take a look at what is there, but there is no way to re-load that 
information back into memory.  A memory dump is a one-way ticket.

-- 
Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

   SAGE member since 1995.  See <http://www.sage.org/> for more info.