dig Queries - Different Answers

Ronan Flood ronan at noc.ulcc.ac.uk
Fri May 19 16:19:32 UTC 2006

b19141 at achilles.ctd.anl.gov (Barry Finkel) wrote:

> I have two zones in DNS, and when I query for a record that was
> recently removed from each zone I get a different response.
> One query gives me NXDOMAIN and one gives me NOERROR.  I thought that
> the NOERROR reply meant that I queried for an "A" record; that record
> does not exist but another record for the same name exists.  But I
> cannot find another record with that name in the zone.  Why the
> difference in the answer packets?
> britaine% dig calendar.et.anl.gov
> ; <<>> DiG 8.3 <<>> calendar.et.anl.gov 
> ;; 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
> ;;      calendar.et.anl.gov, type = A, class = IN

Suggests to me that there is some xxx.calendar.et.anl.gov record,
so the label calendar exists but with no RR attached.

                      Ronan Flood <R.Flood at noc.ulcc.ac.uk>
                        working for but not speaking for
             Network Services, University of London Computer Centre
     (which means: don't bother ULCC if I've said something you don't like)

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