Does not reverse resolve

[Barry Margolin]

In article <19991012084723.A5754 at col7.metta.lk>,  <bind at col7.metta.lk> wrote:
>
>Hi all,
>
>I have managed to set up my DNS with help from you'll,
>and do not find any errors in my settings and my nslookup is ok.
>Thanks for all the help.
>
>However, when someone does a lookup from outside then they get 
>no reverse resolve for 
>
>204.143.107.46 --- metta.lk
>172.16.1.1     --- col7.metta.lk
>172.16.2.1     --- col4.metta.lk

You can't expect the 172.16.x.x addresses to resolve outside your network,
since those are RFC 1918 private addresses, which aren't uniquely assigned
to your site.

In the case of the 204.143.107 addresses, your ISP (Sri Lanka Telecom) has
not delegated reverse DNS for your class C to your servers, they're
delegated to their own servers.  You need to contact them and have them
delegate reverse DNS to you (they'll need to get their upstream ISP, JVNC
Network, to do this).

% dig -x 204.143.107 ns

; <<>> DiG 2.2 <<>> -x ns 
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6
;; flags: qr rd ra; Ques: 1, Ans: 2, Auth: 0, Addit: 2
;; QUESTIONS:
;;	107.143.204.in-addr.arpa, type = NS, class = IN

;; ANSWERS:
107.143.204.in-addr.arpa.	7200	NS	ns1.slt.lk.
107.143.204.in-addr.arpa.	7200	NS	ns2.slt.lk.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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