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Old 07-14-2007, 05:01 AM   #1
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Registered: Jul 2007
Location: Isle of Man
Distribution: Debian, Ubuntu
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Send but not receive using Thinkpad with 3Com PC Card


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.


Old 07-15-2007, 01:55 PM   #2
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Registered: Jul 2007
Location: Isle of Man
Distribution: Debian, Ubuntu
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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.



3com, irq, thinkpad

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