Intranet naming scheme?

[Phil Olson]

Hello,

I am in the planning phases of putting together our company's Intranet and
have several questions.  If our registered domain name is abc.com, should I
use a abc.com on the Intranet dns servers and hosts, and not provide the
Intranet host names to the Internet?  Or would it be best to use a made up
name, i.e. abcompany.int for the Intranet DNS servers and hosts?  How are
you people with established Intranets doing this?

Also, our ISP manages the two DNS servers authoritative for our domain.  I
am wanting to setup two more DNS servers on our Internal network and have be
a Primary/Slave pair for the Intranet zone and also have them act as
forwarders, and forward queries they don't know about (i.e. Internet
queries) to the ISP DNS servers.  Then I would set all the client machines
to point their resolvers to the Intranet DNS pair, NOT the ISP DNS pair.
This way the ISP DNS servers wouldn't have any records of our  Internal
hosts.  Does this sound like I'm on the right track?  I believe the O'Reilly
book on DNS and Bind refer to this as a split or shadow name space.

Thanks in advance.
-Phil