DNS Negative Caching
Barry Margolin
barmar at alum.mit.edu
Thu Aug 27 19:05:25 UTC 2015
In article <mailman.2589.1440684547.26362.bind-users at lists.isc.org>,
Alan Clegg <alan at clegg.com> wrote:
> > 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.
Is that really still true? I thought that use of the Minimum field went
away when it was changed to be the negative cache TTL.
--
Barry Margolin
Arlington, MA
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