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I remember using a command line tool to flash a NIC's link light to identify it. I can't remember for the life of me what it was.

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2 Answers 2

Is ethtool what you're looking for

ethtool --identify eth0 
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up vote 19 down vote accepted

Yeah it was ethtool I was looking for but specifically this will flash the link light for two minutes:

ethtool -p eth0 120
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