Network setup problems (formerly Can anyone give me a clue)

[Ken Januski]

Hi,

I'm starting this thread over from one that used to be called "Can 
anyone give me a clue..." . Sorry for anyone that was trying to help me 
with that thread. I'm thankful for your help but feel I need to rephrase 
the problem.

First of all I have a crossover cable connecting my Debian machine and a 
Windows XP machine. I bought it years ago as an experiment because I 
didn't know if I'd ever really need a network and didn't want to invest 
in anything more. But as far as I know I should be able to get a basic 
network with this. Please correct me if I'm wrong.

I can ping the Debian box from the windows box and can telnet in 
successfully. But any attempts to ping the Windows box, either with 
hostname or IP fail. Basically ping just sits there and does nothing. 
When I end it I find a 100% packet loss.

Ifconfig for eth0 shows both RX and TX packets with no errors or dropped 
packets. Also I notice that if I ping Debian from Debian the lo packet 
count goes up not the eth0. This makes me think that it's using the lo 
interface rather than the eth0. Maybe this is as it should be.

I THOUGHT that at one time I was able to ping the Windows box, but only 
if I turned dialup connection via pon off. That was gist of original 
message but then I found out that I could no longer reach the network 
under any circumstances so I decided it was best to rephrase the 
problem. I do find that if I run pon with eth0 interface up I get this 
error: "chat: Can't get terminal parameters: input/output." I also find 
that if I use "ifconfig eth0 up" while I'm connected via pon that I get 
this error: "pppd script finished...Cannot allocate irq3." So I assume 
that there is an IRQ conflict.

So I'm not sure where to start. It seems to me that the most important 
thing is to first get the network working and then figure out why 
there's a conflict with pon.

Thanks for any suggestions. The NIC by the way is a  3com 3c905c 
Tornado. I also notice that dmesg says "eth0: Cannot allocate IRQ 3" 
right after trying to load the NIC. Perhaps this is the source of the 
problem. But I guess I'm thrown by the fact that I'm able to connect to 
the card from Windows.

I should add that I've gone through Running Linux, Linux Network 
Administrator's Guide, and Linux Administration Handbook and still 
haven't been able to figure out what the problem is. Though I have to 
add I never really noticed the IRQ problem before.

Ken







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