A VPN is only going to slow down your internet speed. IP vanish is a great VPN, used it before and was easy to set up with some of the fastest speeds out there. What are you trying to do with this splitter, Im a little confused? If you are setting it up for you RGH, you are going to most likely set the VPN on your router that's connected to the Xbox. I'm sorry, but I am just not getting what you need a splitter for. Are you trying to share your computers VPN with your XBox?

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r00t wrote Ethernet splitters work by combining the signal from two wires into one and then splitting again. They still require two connections at the source.

This is because 10BASE-T and 100BASE-TX (10 Mb/s and 100 Mb/s) use a pair of wires to transmit and another pair to recieve. There are four pairs of wires in a Cat 5e cable. Using a "normal" splitter will connect the transmit/receive pair on one device to the transmit/receive pair on the other, so it doesn't work this way. Ethernet splitters combine two sets of send/receive pairs onto one cable so they can be split at the destination.

I think what you're looking for is more of a usb to ethernet adapter to "add" an ethernet port to your device rather than a splitter.