[Pdns-users] problem resolving completely with pdns-recursor-3.3.1

[ktm at rice.edu]

Hi PDNS community,

Running pdns-recursor 3.3.1 behind pdns-2.9.22 I am having
a problem resolving the following host:

wwwa.nko.navy.mil

Here is a dig against one of the servers:

$ dig wwwa.nko.navy.mil @ns1.rice.edu

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3 <<>> wwwa.nko.navy.mil @ns1.rice.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 64096
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;wwwa.nko.navy.mil.		IN	A

;; ANSWER SECTION:
wwwa.nko.navy.mil.	180	IN	CNAME	wwwa.nko.navy.mil.apps.gcds.disa.mil.
wwwa.nko.navy.mil.apps.gcds.disa.mil. 300 IN CNAME origin-wwwa.nko.navy.mil.

;; Query time: 164 msec
;; SERVER: 128.42.209.32#53(128.42.209.32)
;; WHEN: Thu Oct 11 08:17:53 2012
;; MSG SIZE  rcvd: 108

Note, that the CNAME origin-wwwa.nko.navy.mil is not looked up to
give the hosts actual IP address:

$ dig origin-wwwa.nko.navy.mil @ns1.rice.edu

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3 <<>> origin-wwwa.nko.navy.mil @ns1.rice.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21780
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;origin-wwwa.nko.navy.mil.	IN	A

;; ANSWER SECTION:
origin-wwwa.nko.navy.mil. 180	IN	A	160.125.250.20

;; Query time: 60 msec
;; SERVER: 128.42.209.32#53(128.42.209.32)
;; WHEN: Thu Oct 11 08:20:10 2012
;; MSG SIZE  rcvd: 58

But sometimes, after some sequence of lookups in the chain I get
the following:

$ dig wwwa.nko.navy.mil @ns1.rice.edu

; <<>> DiG 9.7.3-P3-RedHat-9.7.3-8.P3.el6_2.3 <<>> wwwa.nko.navy.mil @ns1.rice.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56590
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;wwwa.nko.navy.mil.		IN	A

;; ANSWER SECTION:
wwwa.nko.navy.mil.	180	IN	CNAME	wwwa.nko.navy.mil.apps.gcds.disa.mil.
wwwa.nko.navy.mil.apps.gcds.disa.mil. 120 IN CNAME origin-wwwa.nko.navy.mil.
origin-wwwa.nko.navy.mil. 137	IN	A	160.125.250.20

;; Query time: 58 msec
;; SERVER: 128.42.209.32#53(128.42.209.32)
;; WHEN: Thu Oct 11 08:20:53 2012
;; MSG SIZE  rcvd: 124

which does include the final A record information. Does anyone have an idea
about how to fix this or provide a work-around. Any ideas would be appreciated.

Regards,
Ken