TTLs

[Fabiola Caceres]

thank you for all who responded.
Fabiola

On Mon, 16 Jul 2001, Kevin Darcy wrote:

> 
> Barry Margolin wrote:
> 
> > In article <9ivd4b$6ms at pub3.rc.vix.com>,
> > Fabiola Caceres  <fabiola at infi.net> wrote:
> > >NOW, here is the same zone file, but after I reload my name server:
> > >>dig SAO vh4.infi.net
> > >
> > >; <<>> DiG 8.3 <<>> SAO vh4.infi.net
> > >;; res options: init recurs defnam dnsrch
> > >;; got answer:
> > >;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
> > >;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
> > >;; QUERY SECTION:
> > >;;      vh4.infi.net, type = A, class = IN
> > >
> > >;; AUTHORITY SECTION:
> > >vh4.infi.net.           1D IN SOA       ns1.infi.net. hostmaster.infi.net.
> > >(
> > >                                        2001071400      ; serial
> > >                                        3H              ; refresh
> > >                                        1H              ; retry
> > >                                        1W              ; expiry
> > >                                        1D )            ; minimum
> > >
> > >
> > >;; Total query time: 3 msec
> > >;; FROM: ns1.infi.net to SERVER: default -- 209.97.61.10
> > >;; WHEN: Mon Jul 16 14:32:18 2001
> > >;; MSG SIZE  sent: 30  rcvd: 81
> > >
> > >The only difference I see it's the serial number change, but not the TTL
> > >lower to 15 min (900 sec)
> >
> > The TTL of the SOA record is always copied from the "minimum" field of the
> > SOA record.  $TTL is used as the default TTL for all other records.
> 
> Actually, the TTL of the SOA record should only be set to MINIMUM when it's being
> used for negative-caching responses. The reason that Fabiola got confused, I
> think, is because he mispelled SOA as SAO, so the nameserver returned a negative
> caching result (because no A record for vh4.infi.net existed). If SOA had been
> spelled correctly, then the SOA record returned should have had a 900-second TTL,
> as expected.
> 
> 
> - Kevin
> 
> 
> 
>