[root@services:/]->dig -x 192.168.0.2

; <<>> DiG 9.4.1-P1 <<>> -x 192.168.0.2
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9160
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

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

;; ANSWER SECTION:
2.0.168.192.in-addr.arpa. 604800 IN     PTR     firewall.

;; AUTHORITY SECTION:
0.168.192.in-addr.arpa. 604800  IN      NS      localhost.

;; ADDITIONAL SECTION:
localhost.              604800  IN      A       127.0.0.1

;; Query time: 13 msec
;; SERVER: 192.168.0.20#53(192.168.0.20)
;; WHEN: Wed Nov 21 08:06:01 2007
;; MSG SIZE  rcvd: 103

                                                                                                                                                  [root@services:/]->dig firewall.sav.internal

; <<>> DiG 9.4.1-P1 <<>> firewall.sav.internal
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 47178
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;firewall.sav.internal.         IN      A

;; Query time: 3 msec
;; SERVER: 192.168.0.20#53(192.168.0.20)
;; WHEN: Wed Nov 21 08:06:06 2007
;; MSG SIZE  rcvd: 39

 [root@services:namedb]->cat db.sav.internal
$TTL    604800
@       IN      SOA     services.sav.internal. root.localhost. (
                        2007070700     ; Serial
                        604800         ; Refresh
                         86400         ; Retry
                       2419200         ; Expire
                        604800 )       ; Negative Cache TTL
 ; list master and slave name servers below
ns1              IN      NS    192.168.0.20
firewall         IN      A       192.168.0.2
dns              IN      A       192.168.0.20

[root@services:namedb]->cat db.192.168.0
$TTL    604800
0.168.192.in-addr.arpa.  IN      SOA     ns1.sav.internal. root.localhost. (
                         2007070700     ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
        IN      NS      localhost.
2       IN      PTR     firewall.
4       IN      PTR     wizard.
9       IN      PTR     win2k.