USB NIC adaptor strange behavior

[Derek Broughton]

Michael J. Lynch wrote:

> I have a system that has an onboard NIC and a USB NIC and both
> work as expected with one exception.  When I run ifconfig it shows
> the onboard NIC as eth0 and the USB NIC as eth1.  If I disconnect
> the USB NIC by unplugging it from the USB bus I loose all network
> connectivity to the box.  If I run ifconfig, it shows *eth0* (the
> onboard NIC) down and *eth1* (the USB NIC) still up and configured
> even though it was the one disconnected.  Anyone have any ideas
> where I should start looking for the problem.  I'm not real familiar
> with hotplug so I'm not sure where to start looking.
> 
How can you tell that eth1 was the USB NIC ?  I have to admit I can't
imagine how an onboard NIC could get recognized _after_ the USB, but it
sure looks that way.

When you boot without the USB NIC, what's ifconfig say?  When you insert &
remove the USB NIC, what happens?

What make & model of NICs are they?  Watch syslog when you plug in the USB
NIC and note the messages.  Do an lsmod before and after inserting the USB
and note what changes.  I
-- 
derek