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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