I read a blog a while ago that created a loop with a program that flashed the led of each NIC for 30 seconds and printed the interface it was flashing, and for the darned of me didn't think to save it. The program could have been 'ip' but i'm not sure. I do know that it was not 'ifconfig'. Because I have two NIC's that are same build and manufacturer, I'm not able to figure out which NIC is assigned to which interface by MAC address alone. How can I figure which NIC is assigned to which interface?
Ok, found the tool to do this. It's called ethtool, the p switch will blink the led.
for int in eth0 eth1 eth2 do ethtool -p $int 10 done
10 defines the number of seconds. Not all NIC's are supported though so Jeff your method would be better in certain situations. Thanks for the help.