Internet sharing with IP over FireWire from Mac to PC

After I found out that the Ethernet port on my PC is probably dead, I tried IP over FireWire. I am able to see the files on my PC from my Mac and vice versa, but I can't connect to the Internet with my PC.

I connect to the Internet from my Mac with Airport. The PC is connected to my Mac with FireWire. I have enabled Internet Sharing on my Mac, but it doesn't work yet. Any ideas?

Jalexster said:

Make sure it is sharing the internet connection from AirPort, and then make sure it is sharing through the firewire port. You may only be sharing through Ethernet.

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That's all right. Must be something else.