DNS question

I got myself a broadband connection and have set up a smoothwall 2.0 
firewall, with a Green Red and Orange(DMZ). Say I have a domain 
(example.com) can I set the DNS servers for example.com to my smoothwall 
 Red zone ip and have smoothwall redirect it to a server in my DMZ zone?
if so is it just a matter of modifying the hosts file on the smooth wall 
to include to DMZ ip ..

i.e.
192.168.1.1     example.com


and do I just the allow port forwarding on the smoothwall to the above 
ip for the services I want to use ??


I think I am over simplifying how this is done. I have goggled and most 
of the returns are for setting up dynamic dns.

Any pointers to docs or experiences would be grately received.

Jason.


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________________________________________
Senior Software Engineer,
Activant Solutions Ltd.
Longford Ireland.

Email : Jason.Corcoran@xxxxxxxxxxxx
Aim   : JasonCorcoran9
Http  : http://www.activant.com
Phone : + 353 (0) 43 49202

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Irish Linux Users' Group
http://www.linux.ie/mailman/listinfo/ilug/