port forwarding using 3 static ip addresses

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http://serverfault.com – i am new to configuring routers, we have purchased a RV016 cisco business router that has multiwan capability. What we are attempting to do is take map services from 3 different servers and assign 3 different static ip addresses and then forward port 80 through the router. A short term solution to building a proxy server. Is this possible? Right now we have a consumer grade cisco router and assign a static ip and it works, we attempt the same settings on the business router and cannot get the internet, we set it DHCp and it works fine, however we want to to forward the static ports not use DHC ()