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Use a Windows 7 machine to forward a port from one interface to another

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Last Modified: 2012-06-27
I have a Windows machine using a cell-based Internet connection that is always on but frequently changes its IP. I also have a DVR sitting next to the PC with a crossover cable between the DVR and the PC with both devices on the same subnet. What I want to do is use the Internet connection of the PC and its Internet IP address to forward port 8080 traffic through to the DVR which is connected to the Ethernet interface of the PC.

So I require two suggestions.

1. A client-based DDNS solution that is hopefully free, but I don't mind paying for a good one.
2. A software-based solution for forwarding the port 8080 traffic through to the DVR.

Thanks in advance!
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