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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