Allow Access
0) If you are not on the main options screen, click on the left hand menu “BIND DNS Server”.
1) Click on “Zone Defaults”
2) Under “Default Zone Settings”, “Allow queries from” box, select “Listed” and change the box from “localhost” to “any”. This will allow anyone to query your DNS server.
3) Click on “Save”
4) Click on “Return to zone list” at the bottom of the page.
5) Click on “Addresses and Topology”.
6) Under “Global address and topology options”, under “Ports and address to listen on”, select “Listed below” and in the first row, make sure that “Default” is not selected, and the second radio box is selected. In the text box there should be “53” indicating that we are running DNS on port 53. In the “Address” column, change the value to “any” to allow anyone to access this port.
7) Click on “Save”
Restart
1) In the top right hand corner, “Stop BIND” and then “Start BIND” to restart the service. DNS typically takes 72 hours to propogate, but more often than not, it takes less than an hour for local DNS servers to pick up.
more info
http://www.webtop.com.au/blog/how-to-setup-dns-using-webmin-2009052848