Thank you very much.. this helped alot ..
Thanks again Jeremy
On
2012-09-21 16:13, Jeremy C. Reed wrote:
> On Fri, 21 Sep 2012, Robert
JR wrote:
>
>> i have the minimum value in my dns server as 60 mins,
and my TTL is 60 Seconds , but still when users hit a non exist record ,
the other dns hold the negative cache for 60 secs instead of 60 mins ..
? why ? $TTL 60 @ IN SOA NS1.TEST.BIZ. Abuse.TEST.BIZ. ( 201208281 ;
serial, todays date + todays serial # 8H ; refresh, seconds 2H ; retry,
seconds 4W ; expire, seconds 1H ) ; minimum, seconds ; Although my
configuration above, all DNS servers that query my server, cache the non
exist record for 60 seconds only and not 60 mins As mentioned in my
configuration ? any ideas why ?
>
> See RFC 2308 in regards to Caching
Negative Answers about how the auth
> server returns an SOA for a
NXDOMAIN:
>
> ``When the authoritative server creates this record its
TTL
> is taken from the minimum of the SOA.MINIMUM field and SOA's
TTL.''
>
> It used the the smaller TTL.
>
> I often see the reverse --
for example, the SOA's TTL is 7200 and the
> MINIMUM is 3600, so the
returned record (in the auth section) has the
> TTL as 3600.
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