On 11 Feb 2007, at 22:50, Steven M. Bellovin wrote:
>> So I bought a cheap realtek pci card and plugged it in and it appears
>> to do the same thing - I can see arp packets coming out of it but the
>> machine never notices the response packets sent back.

That could be an interrupt routing problem. Can you put e.g. a USB  
controller
in that PCI slot?

>>   However if I
>> move the realtek card to an Optiplex 620 it works fine.
>>
>> Anyone got any idea whats going on?
>
> At that point, I'd wonder about the cable.

Or the switch (port).

	Kind regards

-- 
Matthias Scheler                           http://zhadum.org.uk/