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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