ICS help!

Hi

so my situation i have is this:

I have compA with a wireless card that connects to the internet through a router running windowsxp with an additional nic. I have compB with a nic running linux. What i want to do connect the 2 comps together through a cat5 cable to give internet access to compB. Ive tried using the ics but to no avail. Am i missing some settings or anyone have any tips for me to get internet on compB?

I dont want to run cable to the router or invest in another wireless card.
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