DNS Negative Caching

Reindl Harald h.reindl at thelounge.net
Thu Aug 27 14:24:28 UTC 2015


Am 27.08.2015 um 16:08 schrieb Alan Clegg:
>>          on the DNS Zone file we have these records
>>          $ORIGIN e164.arpa.
>>          @   IN     SOA  picardvm2.e164.arpa. e164-contacts.e164.arpa.  (
>>                                           2002022404 ; serial
>>                                           3H ; refresh
>>                                           15 ; retry
>>                                           1w ; expire
>>          *3h* ; minimum
>>                                          )
>
> I wasn't really following this thread, but now that I see this, I would
> like to add that the "expire" timer is also used as the default TTL for
> resource records that do not have one specified, and if there is not an
> explicit $TTL statement in the zone file.
>
> Personally, I doubt that a 1 week TTL is a good idea

it is a damned good idea because it's the value after your slaves start 
to drop zones in case of connection / zone-transfer troubles

a zone without an explicit $TTL statement is questionable to say it polite

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