172.16/12 Reverse Maps Don't work.

[Martin McCormick]

	We have bind9 correctly serving several private-network zones
but I can't for the life of me, get the reverse map for
172.16.IN-ADDR.ARPA. to work at all.

	The start of the zone looks like:

;
;	16.172.in-addr.arpa
;

$TTL 43200
@       IN     SOA  ns.xyz. martin.dc.cis.okstate.edu.  (
                                1; Serial
                                    14400; Refresh
                                    900; Retry
                                  1209600; Expire
                                   30 ) ;Minimum
  IN	NS	ns.xyz.
  IN	NS	ns2.xyz.
1.16.172.IN-ADDR.ARPA. 43200	IN	PTR	ns.xyz.

	All reverse queries to 172.16.1.1 take what I frustratedly
like to call the thousand-mile route in that, instead of going across
the room where they physically are, they get a bit lost out there in
the Internet.

dig @172.16.1.1 172.22.12.4 -x (an address registered in the network)


; <<>> DiG 9.2.3 <<>> @172.16.1.1 -x 172.22.12.4
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26347
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

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

;; AUTHORITY SECTION:
22.172.in-addr.arpa.	9594	IN	SOA	prisoner.iana.org. hostmaster.root-servers.org. 1 604800 60 604800 604800

;; Query time: 1 msec
;; SERVER: 172.16.1.1#53(172.16.1.1)
;; WHEN: Thu Jun 16 15:18:23 2005
;; MSG SIZE  rcvd: 119


	The name server log says that the zone successfully loaded but
lookups can't find any reverse information.

	We did have reverse lookups in that network working when we
had a Class C-sized subnet active at 172.16.1/24.  It only broke when
I thought I redefined the IN-ADDR.ARPA. zone to encompass the entire
/12 network from 172.16.0.1 through 172.35.255.254.

	Any ideas as to why this isn't working?

	Thank you.

Martin McCormick WB5AGZ  Stillwater, OK 
OSU Information Technology Division Network Operations Group