2013/01/14

Reverse lookup of a /64 prefix

Reverse lookup is necessary for IPv6 address assigned to SMTP Server otherwise the emails sent out will be treated as spam by other SMTP servers.  To this end, I have asked my serving ISP to dedicate the reverse lookup of  the prefix 2401:300:0:1::/64 to me.  The configuration at my side is tested ok and perfect.

[localhost ~]# dig -x 2401:300:0:1::8080

; <<>> DiG 9.5.2-RedHat-9.5.2-1.fc10 <<>> -x 2401:300:0:1::8080
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- 36584="36584" font="font" id:="id:" noerror="noerror" opcode:="opcode:" query="query" status:="status:">
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 4

;; QUESTION SECTION:
;0.8.0.8.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.3.0.1.0.4.2.ip6.arpa. IN PTR

;; ANSWER SECTION:
0.8.0.8.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.3.0.1.0.4.2.ip6.arpa. 86400IN PTR v6-mail.com.

;; AUTHORITY SECTION:
1.0.0.0.0.0.0.0.0.0.3.0.1.0.4.2.ip6.arpa. 86400 IN NS ns2.i3way.net.
1.0.0.0.0.0.0.0.0.0.3.0.1.0.4.2.ip6.arpa. 86400 IN NS ns1.i3way.net.

;; ADDITIONAL SECTION:
ns1.i3way.net.          3600    IN      A       202.81.252.116
ns1.i3way.net.          3600    IN      AAAA    2401:300:0:1::8080
ns2.i3way.net.          3600    IN      A       202.81.252.117
ns2.i3way.net.          3600    IN      AAAA    2001:470:18:16c::2

;; Query time: 1 msec
;; SERVER: 202.81.252.116#53(202.81.252.116)
;; WHEN: Mon Jan 14 09:07:46 2013
;; MSG SIZE  rcvd: 248

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