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.


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

ethtool -p eth0 120
  • it will blink activity led ( orange) or link light (green)? Jul 9 '20 at 10:40

Is ethtool what you're looking for

ethtool --identify eth0 

Ethtool also works with vmware ESXi with -p parameter:

Example: ethtool -p vmnic0 15

vmnic0 will blink for 15 seconds

Here is a video that shows how it works (at 2:50 shows blink):


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