How to stop listing though 'ls domainname'?

[Azhar H. Chowdhury]

Hi!

I am new to this mailing list and bind also. I am facing
small problem and looking for your kind help.

When I run 'ls <MYDOMAINNAME.COM>' from nslookup where
server set to my DNS server which is running latest version
of BIND at LINUX, it's show each entries. I want to stop
it and implement such a way that only from fixed IP address
can view listing of domain. 

Looking for your kind reply.

Regards,

Azhar Chowdhury