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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