[dns-operations] 167.216.129.170 RDNS

[Dave Brockman]

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Hello All,
  I am having difficulty resolving Reverse DNS for 167.216.129.170,
and I'm not entirely certain why.  If I just do a dig -x
167.216.129.170 I get:

; <<>> DiG 9.7.3 <<>> -x 167.216.129.170
;; global options: +cmd
;; connection timed out; no servers could be reached


If I dig -x +trace 167.216.129.170:

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28671
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;167.216.129.170.               IN      A

;; AUTHORITY SECTION:
.                       10549   IN      SOA     a.root-servers.net.
nstld.verisign-grs.com. 2014091100 1800 900 604800 86400


and finally, if I  dig -x 167.216.129.170 @8.8.8.8:

;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 58383
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;170.129.216.167.in-addr.arpa.  IN      PTR

;; ANSWER SECTION:
170.129.216.167.in-addr.arpa. 3047 IN   CNAME
170.0-24.129.216.167.in-addr.arpa.
170.0-24.129.216.167.in-addr.arpa. 3047 IN PTR  nmail2.netsuite.com.


This is impacting my ability to receive transactional emails from this
IP address in particular.  My DNS server is running Bind 9.7.3 on
Debian Squeeze.  I thought perhaps my DNS server was being blocked,
but that wouldn't explain the NXDOMAIN I don't believe.  I apologize
in advance if this is something simple and/or obvious, but can anyone
explain what is happening and/or how to correct it?  Many thanks in
advance!

Regards,

dtb

Dave Brockman
Senior Network Engineer


- -- 
"Some things in life can never be fully appreciated nor understood
unless experienced firsthand. Some things in networking can never be
fully understood by someone who neither builds commercial networking
equipment nor runs an operational network." RFC 1925
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