Probably too basic for the list - but I'll ask and duck....

I have sbcglobal.net  (AT&T) for an ISP with 5 fixed IP addresses

Firewall with 3 NIC's:
   one to DSL modem
   one to DMZ mail/web server
   one to Internal LAN via 10/100 switch

If I want to split the mail and web server into TWO unique IP 
addresses/computers - do I need (or want) to add a 4th NIC or will the 
right thing happen with a switch between the Firewall and DMZ computer(s) 
?   (a switch would be giving me easier ability to use all 5 addresses)
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