Networking Problems w/ an Intel Ethernet Express Pro

An Anonymous Coward submitted the following question: "Some one gave me a Packard Bell Legend 425 (486SX) and I wanted to put slackware 3.5 on it, which I did, then I bought an Intel Ethernet Express Pro 10+ ISA network card. If I ping the linux box from Windows it shows 100% packetloss and vice versa for the linux box. Could any one tell me what is wrong? I have tried using: route add -net 131.204.207.0 eth0. Any suggestions? And yes, I have read the net how-to." There are more details. Click in to the article if you can help! Here are more details on the submittor's network configuration:

"It was a Plug and play card and my 486 did not have PnP bios so I had to configure it in my K6-2 350 and then I put the card in my 486 and booted from a DOS floppy and ran the Intel tests on it and the tests came back that the card was working fine and it had a network connection. I booted to linux and loaded up the eepro.o module (with the irq=10 and io=0x300,0x30F) and it reported it found the card. Then I uncommented the modprobe line in /etc/rc.d/rc.modules and added the IRQ and IO settings to the line and dmesg shows the card as working. I have the ip on the machine set to 131.204.207.202 (this is just a lan) and a windows machine set at 131.204.207.201."

Just as an aside, I usually do not run submissions that don't have a valid e-mail address associated with it. Most Ask Slashdot submissions I try to handle myself, and if I can't get back to the submittor to ask for more information about the question, then it gets shoved into the round file. PLEASE: If you want to make Ask Slashdot submissions and want to have a decent chance of getting SOME form of answer, please include a working e-mail (or a URL where I can get one) so I can respond if the need arises. If not, then submissions will have to be really interesting for me to submit them.