How to Setup a Name Servers visible on Internet?

[Stephane Bortzmeyer]

On Tue, Jun 14, 2011 at 09:58:36AM +0200,
 erickom at kom.za.net <erickom at kom.za.net> wrote 
 a message of 80 lines which said:

> sorry for that, please see below the content for my reverse file data:
> 
> File: /var/cache/bind/metropolitanbntu.co.za.inv:
...
> 41.134.194.90.  IN      PTR     ns1.metropolitanbuntu.co.za.

Then, BIND is perfectly right, 41.134.194.90 does not belong to
0.0.10.in-addr.arpa...

> 10.0.0.80.      IN      PTR     ns1.metropolitanbuntu.co.za.

More subtle here: you should have learn about PTR records before
trying it (may I suggest Liu & Albitz' book?) 10.0.0.80 should have
been written just 80 (thus forming the name 80.0.0.10.in-addr.arpa).