DNS problem

[rAdKy]

Hello, I have a problem with dns server (bind9)
Since when added domain example.com.db my file looks like this:

Code:

$TTL 12H
$ORIGIN example.com.
@               IN              SOA             ns1.example.com. postmaster.example.com. (
; dmn [example.com] timestamp entry BEGIN.
                         2010041802
; dmn [example.com] timestamp entry END.
                8H              ; Refresh
                30M             ; Retry
                4W              ; Expire
                3H              ; Minimum TTL
)
                IN              NS              ns1.example.com.
                IN              NS              ns2.example.com.
                IN              MX      10      mail.example.com.

example.com.     IN              A               192.168.1.2
www             IN              A               192.168.1.2
example.com.     IN              TXT             "v=spf1 a mx ip4:192.168.1.2 ip4:192.168.1.2 ~all"
localhost       IN              A               127.0.0.1
mail            IN              A               192.168.1.2
ns1             IN              A               192.168.1.2
ns2             IN              A               192.168.1.2
; CNAME for VHCS compatibility
ns              IN              CNAME           ns1
; CNAME for mail transfer
imap            IN              CNAME           mail
pop             IN              CNAME           mail
pop3            IN              CNAME           mail
relay           IN              CNAME           mail
smtp            IN              CNAME           mail
; CNAME for web transfer
ftp             IN              CNAME           www

My internet goes through a router and it is a private ip. Tell me which file handle to adjust to your actual ip there.
And another thing, how to do DNS server to update more often?