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Recommend a router for handling multiple public IPs

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Last Modified: 2012-05-11
I have 4 public IPs from my ISP and their router that they gave me has 4 ports on the back.  I understand how this works, 1 port 1 static IP.  So if I plug in a router I static the router and all pcs/laptops/servers connected would see each other and share that same gateway for the internet.  What I need is a router that could allow me to have devices connected to the internet from the shared public IP xxx.xxx.xxx.023 but my mail server recieve traffic from a differnent IP ( xxx.xxx.xxx.025) to its static internal IP.  I heard something about NAT...

My example - I have a domain running exchange and I'll eventually have a web server.  The both mail and webservers will need to communicate with the domain pc's however I need to have outside connections to make the mail and web services work.  I can't forward port 80 soley to my webserver because of my other PC"s so I need a router that can NAT?? I'm not a cisco engineer my strengths are domains enviroments.  Any help in picking a good router for this would be appreciated.  I'm just starting out I would rather perfer the budget friendly type of router that would accomodate me :)
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