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To securely allow a specific IP to transfer or update a zone, you need to use the allow-transfer or allow-update options within named.conf for the specific domain.
For a list of examples, please see the following two links:
http://www.zytrax.com/books/dns/ch7/xfer.html
http://www.cyberciti.biz/tips/howto-...-dns-bind.html
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