If you want to make sure which physical interface is eth0 and which is eth1 or eth2 and so on
run:
#ethtool -p eth0 20
This blinks the LED on the interface for five seconds–without interrupting network traffic.
#ethtool eth0
This will show the port speed .
A good article over ethtool can be found here.
http://www.thegeekstuff.com/2010/10/ethtool-command/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+TheGeekStuff+%28The+Geek+Stuff%29
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