Bridgeing connections.

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I'll assume that you are attempting to do this as a temporary measure while your buddy is visiting.

If you want to connect 2 computers that way you need two public IP addresses from your ISP. Some cable companies will provide additional IP addresses for a monthly charge.

Using Internet Connection Sharing (ICS) or using a broadband router are the preferred ways. With the latter being more preferred.

 

Thanks for that link, invalidusername. I did not realize that

"Tip
You might have multiple adapters installed because you have a NIC that connects to a broadband Internet connection device, such as a DSL or cable modem. These adapters cannot be bridged."

If that tip is true, then forget what I said about obtaining multiple IP addresses from your ISP; it won't work anyhow. My guess, though, is that the tip is not completely true and my original statement still holds.