Send but not receive using Thinkpad with 3Com PC Card
 

Hi.

My network card is recognised and appears to be sending but not receiving data on the network.

I have a Thinkpad 600E with 3Com Megahertz 3CCFE574BT PC Card. It worked fine with Debian Sarge using a 2.4 kernel, but I'm having trouble getting it to work with a 2.6 kernel.

I've tried Debian Etch (4.0r0) and Knoppix (5.0.1). In both cases, the card *is* recognised. It fails to get an IP address using DHCP. I can manually assign an IP address, but it then fails to ping the router or another host on the LAN.

I have used Wireshark to try to figure out what is going on. I can see the laptop sending a DHCP request, but not receiving a response. With a static IP, I can see the laptop sending ARP requests, but not receiving responses, even though I see the ARP responses are being sent.

Pretty weird, no?

In dmesg I notice a couple of "eth0 interrupt(s) dropped!" messages.

I'm not sure where to go from here, so I'd appreciate any suggestions.

Thanks.

Scott

I've got it working now.

It turns out the "eth0 interrupt(s) dropped!" message was relevant. I don't really understand the details, but I think it indicated an IRQ conflict.

I checked the IRQs with:

cat /proc/interrupts

It showed the pcmcia card on IRQ 3. I edited /etc/pcmicia/config.opts and added the line:

exclude irq 3

After a reboot, the pc card is now in IRQ 4 and is able to connect to the network.

Scott