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As people above said, most users these days won't take advantage of the second IP, unless they want to seperate their network, or don't have a router, or rapidshare lol.
But if you really wanted to know how two IP's can be utilized, this is how my setup is.
IP #1 - Connected with a Sonicwall firewall followed by a switch
Small business server/webserver/exchange server
IP #2 - Connected with a Wireless Router
Personal Computer, Laptops for when friends bring theirs over, PS3
What this does is keeps my business network seperate from my personal network, so if for any reason one of my networks were compromised, it won't affect the other network.
hope that clears it up a bit.
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