clarification on SOA

[Karl Auer]

On Wed, 2010-12-01 at 19:05 +0530, rams wrote:
> I have one SOA record as follows in zone.
> 
> qa.com.   86400   IN SOA ramesh.com. qa.com. (
>                     2009111903 ; serial
>                     10800      ; refresh (3 hours)
>                     3600       ; retry (1 hour)
>                     2592000    ; expire (4 weeks 2 days)
>                     300      ; minimum (1 day)
>                     )
> 
> I queried for non exist domain against bind. Bind is returning SOA
> record with 300 as TTL value. Is it correct? Because in my zone , SOA
> has 86400 TTL.
> 
For NXDOMAIN, the TTL returned will be the lower value of the SOA TTL
and NCACHE/MINIMUM. So in this case, 300 seconds.

See RFC mumblemumble. I know this through being comprehensively
ejumacated on this very list because I thought the SOA TTL had to be
zero...

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/kauer/                   +61-428-957160 (mob)

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