NXDomain for AAAA at vtext.com

John D Smerdon jds at smerdon.livonia.mi.us
Sat Nov 2 17:00:51 UTC 2002



I am trying to send mail to vtext.com (Verizon Cell Phone SMS).  My system 
is running NetBSD/i386 1.6 with bind "8.3.3-REL-NOESW" and the Verizon DNS 
servers claim "9.2.1".

My system is configured for IPv6 and sendmail does a lookup for the AAAA 
record first.  Verizon's DNS servers respond with NXDomain.  Shouldn't they 
respond with NoError and no answer records?  Sendmail then does a lookup 
for the A record and seems to have cached the NXDomain reply.

The result is that I am unable to send an email to my new phone.

Is my DNS at fault or theirs?

Results from a `dig smtp.css.vtext.com aaaa ; dig smtp.css.vtext.com a`

tcpdump on lo0:

   11:46:04.781297 10.1.1.33.59538 > 10.1.1.33.53:  2+ AAAA? 
smtp.css.vtext.com. (36)
   11:46:04.884862 10.1.1.33.53 > 10.1.1.33.59538:  2 NXDomain 0/0/0 (36)
   11:46:04.906100 10.1.1.33.59537 > 10.1.1.33.53:  2+ A? 
smtp.css.vtext.com. (36)
   11:46:04.907856 10.1.1.33.53 > 10.1.1.33.59537:  2 NXDomain 0/0/0 (36)

tcpdump on ethernet:

   11:46:04.783478 208.176.108.1.59567 > 66.174.3.4.53:  20445 AAAA? 
smtp.css.vtext.com. (36)
   11:46:04.883994 66.174.3.4.53 > 208.176.108.1.59567:  20445 NXDomain- 
0/0/0 (36)

$dig @66.174.6.71 version.bind chaos txt

   version.bind.           0S CHAOS TXT    "9.2.1"

Answers for various queries:

   vtext.com.              2D IN NS        NJBDNS2.vtext.com.
   vtext.com.              2D IN NS        CAWCNS1.vtext.com.
   vtext.com.              2D IN NS        CAWCNS2.vtext.com.
   vtext.com.              2D IN NS        NJBDNS1.vtext.com.

   NJBDNS2.vtext.com.      2D IN A         66.174.3.72
   CAWCNS1.vtext.com.      2D IN A         66.174.6.71
   CAWCNS2.vtext.com.      2D IN A         66.174.6.72
   NJBDNS1.vtext.com.      2D IN A         66.174.3.71

   vtext.com.              30M IN MX       100 smtp.css.vtext.com.

   smtp.css.vtext.com.     0S IN A         66.174.3.10



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