Many companies use the same DNS servers for both their internal network and
their Internet side of the network. This is a bad idea because it exposes
the structure of their internal network to intruders.
The easiest way to do this is set up a two independent DNS servers that are
updated separately. The internal server contains the database of all theDNS
names within the organization, whereas the external server knows only how
to resolve names dealing with the external presence, such as e-mail
forwarders and web servers.
Refer to http://www.acmebw.com/askmrdns/00408.htm
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