Internet stopped working on second pc

Hello,

Some time ago the internet on my second computer stopped working properly. There are some pages on the internet that I can see, but most I can't see. My second computer is connected to my first computer with a cable, and my first pc is the only pc which is directly connected to the internet.

I have no idea why it doesn't work anymore. At first my second PC used Windows ME, then we tried Windows XP Pro Service Pack 3, we also tried Linux, but I have the same problems with all operating systems. I tried shutting down the firewalls on both pcs and that didn't make a difference. With each browser I had the same problems

Trying to adjust some Internet Explorer settings also didn't work.

I hope you have an answer for my problem, because I have no idea how to solve it.

Thanks in advance,
Stefan