[Pdns-users] lookup failing only with pdns recursor

[Mark Felder]

Ok here's the scenario. We've done a lot of testing and we've discovered  
this weird, weird bug:

Requirements:

- pdns recursor, confirmed with version 3.3
- domain we're looking up: ncura.omnicms.com

Test with host from my server to get an idea of what we're working with:

mwi1% host ncura.omnicms.com
ncura.omnicms.com is an alias for ncura.confex.com.
ncura.confex.com is an alias for cluster3.confex.com.
cluster3.confex.com has address 69.26.96.84


Dig from my server to PowerDNS Recursor:

mwi1% dig @66.170.1.10 ncura.omnicms.com

; <<>> DiG 9.6.-ESV-R3 <<>> @66.170.1.10 ncura.omnicms.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36984
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;ncura.omnicms.com.             IN      A

;; AUTHORITY SECTION:
omnicms.com.            3297    IN      SOA     dns1.supranet.net.  
hostmaster.supranet.net. 2010101200 1800 900 604800 3600

;; Query time: 0 msec
;; SERVER: 66.170.1.10#53(66.170.1.10)
;; WHEN: Wed Apr 27 17:53:57 2011
;; MSG SIZE  rcvd: 99


Dig from my server to our other lookup server which is BIND:


mwi1% dig @66.170.1.19 ncura.omnicms.com

; <<>> DiG 9.6.-ESV-R3 <<>> @66.170.1.19 ncura.omnicms.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37513
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;ncura.omnicms.com.             IN      A

;; ANSWER SECTION:
ncura.omnicms.com.      1933    IN      CNAME   ncura.confex.com.
ncura.confex.com.       80996   IN      CNAME   cluster3.confex.com.
cluster3.confex.com.    80996   IN      A       69.26.96.84

;; Query time: 0 msec
;; SERVER: 66.170.1.19#53(66.170.1.19)
;; WHEN: Wed Apr 27 17:54:27 2011
;; MSG SIZE  rcvd: 101



Behavior also recreated with nslookup, etc.


Any ideas on what this is? This is crazy.



Thanks,



Mark