OT: Authoritative Server returning RR's with decrementing TTL's?

Ray Van Dolson rvandolson at esri.com
Thu Jul 31 19:56:17 UTC 2014


Not BIND-related specifically... (though the server below could be
running BIND I suppose).

This seems weird.  Why is this authoritative server returning *some*
answers with decrementing TTL's?

$ dig @ns1.dtra.mil dtra.mil NS

; <<>> DiG 9.7.4-P1-RedHat-9.7.4-2.P1.fc14 <<>> @ns1.dtra.mil dtra.mil NS
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34658
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dtra.mil.                      IN      NS

;; ANSWER SECTION:
dtra.mil.               2002    IN      NS      ns1.dtra.mil.
dtra.mil.               3359    IN      NS      ns2.dtra.mil.

;; Query time: 92 msec
;; SERVER: 214.27.180.254#53(214.27.180.254)
;; WHEN: Thu Jul 31 12:47:33 2014
;; MSG SIZE  rcvd: 62

$ dig @ns1.dtra.mil dtra.mil NS

; <<>> DiG 9.7.4-P1-RedHat-9.7.4-2.P1.fc14 <<>> @ns1.dtra.mil dtra.mil NS
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22108
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dtra.mil.                      IN      NS

;; ANSWER SECTION:
dtra.mil.               1999    IN      NS      ns1.dtra.mil.
dtra.mil.               3359    IN      NS      ns2.dtra.mil.

;; Query time: 90 msec
;; SERVER: 214.27.180.254#53(214.27.180.254)
;; WHEN: Thu Jul 31 12:47:35 2014
;; MSG SIZE  rcvd: 62

Server behaves the same way even if I do the queries without recursion
desired...

Odd.

Ray


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