Query on DNS Bind cache setting

[Sabat Gangadhar]

Hi All,

In DNS bind, two clean the cache, 2 types of cache setting are
there. One is at zone level by default 24hr, and another at server level
such as max-cache-ttl, max-ncache-ttl and cleaning-interval.
Which level setting is effective if both options are set?
Thanks in advance.

Regards,
Gangadhar

[David Botham]

bind-use...@isc.org wrote on 05/18/2005 05:34:50 AM:
> Hi All,
>
> In DNS bind, two clean the cache, 2 types of cache setting are
> there. One is at zone level by default 24hr, and another at server level
> such as max-cache-ttl, max-ncache-ttl and cleaning-interval.
> Which level setting is effective if both options are set?

I think you may be approaching caching from the wrong perspective.

Zone administrators set the TTL on RR's in the zones that they control.
They also set a negative caching TTL for the zone. The negative caching
TTL is used to tell remote name servers how long to *not* come back and
ask about a RR that does not exist.

Now, name server administrators can tell their name server processes to
put bounds on the TTL's set by Zone Administrators. You have mentioned
about the named.conf options used for this purpose.

hth,

Dave...