Why servers in DMZ have 2 different IP addresses?

I notice that all of my company's unix servers in the DMZ have 2 IP addresses.
Could you expalin why?
Thanks! Points will be given.

Hi Laura,
DMZ is used as Security factor!
In this you use the NAT protocol, which has an external IP adress and a internal IP address.
The external IP address is available for pulbic and the internal for the System to work with but not known to pulbic for security reasons!
For details on that :
http://documents.made-it.com/sap-int.html
SAP Web Dispatcher Pre-Authentication
http://compnetworking.about.com/cs/networksecurity/g/bldef_dmz.htm
Regards,
Prem
http://compnetworking.about.com/cs/networksecurity/g/bldef_dmz.htm

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