Re: [Sheflug] How weird is this?

[Alex Hudson <xxxxx [at] xxxxxxxxxxxxxx>]

On Sun, 2001-12-16 at 09:02, Alistair Williamson wrote:
> I have made some progress at last! I figured there must be a hardware 
> conflict somewhere (still haven't found out where?) in the process of 
> tracking down this conflict, I installed a second NIC again and, if I set the 
> IP of the first NIC to a different network - the second NIC works? But then, 
> if I remove the first NIC - the second NIC stops working???

Weird!!!

The _only_ sensible explanation I can come up with is this: your
motherboard must have an on-board ethernet chip somewhere. Not
necessarily a connector for it, but there must be something. When you
were configuring the network card, you could have been configuring this
on-board service by accident. It's also possible that Linux was
mistaking some other piece of hardware for a network card, but I've
never heard of that!

But even that doesn't make complete sense :( Perhaps you have a slightly
broken motherboard, or something - if one of the IRQ lines was dodgy,
putting in two cards would force one of them to take a different IRQ,
and if the original (normal) one was the one that was broken, that would
cause the second card to work when there were two and fail if there was
only one. 

Finally, it could be something to do with the IRQ steering - but I don't
know enough about that to see how it might cause the problem :)

Oh well....

Cheers,

Alex.


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