dig Queries - Different Answers

Barry Finkel b19141 at achilles.ctd.anl.gov
Fri May 19 15:31:23 UTC 2006


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
;; QUERY SECTION:
;;      calendar.et.anl.gov, type = A, class = IN

;; AUTHORITY SECTION:
et.anl.gov.             1D IN SOA       dns0.anl.gov. hostmaster.anl.gov. (
                                        2006051900      ; serial
                                        2H              ; refresh
                                        1H              ; retry
                                        2W              ; expiry
            1W )            ; minimum


;; Total query time: 3 msec
;; FROM: britaine.ctd.anl.gov to SERVER: default -- 146.139.254.5
;; WHEN: Fri May 19 10:29:32 2006
;; MSG SIZE  sent: 37  rcvd: 89

britaine% dig calendar.msd.anl.gov

; <<>> DiG 8.3 <<>> calendar.msd.anl.gov 
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;;      calendar.msd.anl.gov, type = A, class = IN

;; AUTHORITY SECTION:
msd.anl.gov.            1D IN SOA       dns0.anl.gov. hostmaster.anl.gov. (
                                        2006051900      ; serial
                                        2H              ; refresh
                                        1H              ; retry
                                        2W              ; expiry
                                        1W )            ; minimum


;; Total query time: 1 msec
;; FROM: britaine.ctd.anl.gov to SERVER: default -- 146.139.254.5
;; WHEN: Fri May 19 10:29:39 2006
;; MSG SIZE  sent: 38  rcvd: 90

britaine%
----------------------------------------------------------------------
Barry S. Finkel
Computing and Information Systems Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-4601
Building 222, Room D209              Internet: BSFinkel at anl.gov
Argonne, IL   60439-4828             IBMMAIL:  I1004994



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