Reverse zone lookup

[Alexander Celle T.]

Hi, after almost a week I got my chrooted version of DNS working.  I also
separated it into external and internal but my external reverse does not
seem to work properly.  My file is

@	IN	SOA	ns.mydomain. hostmaster.mydomain. (
				2000082802	;Serial
				8H	;Refresh
				2H		;Retry
				1W	;Expire
				1D )	;Minimum
		NS	ns.mydomain.
		NS	ns.IP.number.ISP.
50	PTR	ns.mydomain.
50	PTR	mail.mydomain.
51	PTR	www.mydomain.

When performing a nslookup for an IP number (i.e. xx.xx.xx.50) I get
non-existent host, etc.

What's wrong?

Thanks

Alexander Celle T.
acelle at puc.cl