AAAA requests are case sensative causing nxdoamin

[Dantzig, Brian]

The example you included has the problem. Look at the "Status:" on the
HEADER line. They are not identical. The first has NOERROR the second
has NXDOMAIN.

                                       --------
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37516
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 32592
                                       --------

I also have packet captures of the external system doing lookups for
their mail system. The results are the same.
 
From:
Brian Dantzig
Senior Network Engineer
Medline Industries
Office:  847.837.2795
Mobile: 847.276.7169
bdantzig at medline.com

-----Original Message-----
From: list-bounces at maradns.org [mailto:list-bounces at maradns.org] On
Behalf Of Ken Lyons - Graphix Wizard/Data-Forms
Sent: Wednesday, October 28, 2009 11:02 AM
To: list at maradns.org
Subject: Re: AAAA requests are case sensative causing nxdoamin


> When I test with:
>     dig @ns1.medline.net  medline.com AAAA
> I get the expected NOERROR  with no resource returned.
>
> When I use all caps:
>     dig @ns1.medline.net MEDLINE.COM  AAAA
> I get NXDOMAIN
>
>   

Here are my results... both identical. Maybe it's just your local  dig 
program?



 dig @ns1.medline.net  medline.com AAAA

; <<>> DiG 9.5.1-P2 <<>> @ns1.medline.net medline.com AAAA
; (2 servers found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37516
;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;medline.com.                   IN      AAAA

;; AUTHORITY SECTION:
medline.com.            1800    IN      SOA     ns1.medline.net. 
networkteam.medline.com. 2009102800 900 400 604800 800

;; Query time: 188 msec
;; SERVER: 205.233.244.185#53(205.233.244.185)
;; WHEN: Wed Oct 28 11:52:58 2009
;; MSG SIZE  rcvd: 92



dig @ns1.medline.net MEDLINE.COM  AAAA

; <<>> DiG 9.5.1-P2 <<>> @ns1.medline.net MEDLINE.COM AAAA
; (2 servers found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 32592
;; flags: qr aa; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;MEDLINE.COM.                   IN      AAAA

;; AUTHORITY SECTION:
medline.com.            1800    IN      SOA     ns1.medline.net. 
networkteam.medline.com. 2009102800 900 400 604800 800

;; Query time: 92 msec
;; SERVER: 205.233.244.185#53(205.233.244.185)
;; WHEN: Wed Oct 28 11:53:03 2009
;; MSG SIZE  rcvd: 103

root at vpnc0909:/tmp#