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DXport is an app that will let multiple people play most games that use the Directplay network code (mostly Microsoft titles) behind a NAT/Router. Normally you are limited to a single client behind a NAT/Router unless your router supports UPnP. This may also be an option for people that don't like the security issues with UPnP.

DXport allows multiple computers behind a NAT device to connect to Internet games that use the DirectX Netcode.