DNS

[Gardiner, James]

Raj,

The form of the question is a little difficult to understand but having a stab at what you mean..
(I am assuming you are using a BIND DNS server - please ignore if you are using something else)

The Default TTL (for all records in the zone) will be set at 1 day.
The Negative Caching TTL will be set to 2 days. This is because in modern versions of BIND the last field in the SOA record which _used_to_be called "minimum TTL" as of RFC 1035 was superseeded by a "Negative Cacheing TTL" in RFC 2308 and was first implemented in BIND 8.x I think ?

So any queries your server answers with NXDOMAIN error code will be cached for up to 2 days by dowstream slaves or caching servers, whereas correct valid answers for your zone will only live for 1 day. (before the SOA is requested again, or the record expires).

Hope this is what you meant?

J

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Raj Har
Sent: Friday, 3 April 2009 4:37 PM
To: redhat-list at redhat.com
Subject: DNS

hello all,

                 In DNS database file /var/named/mydoamin.

                  if i give +TTL 1 day and minimum (- TTL) 2 day.

wat will happen in this case?

Thanks
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