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Emulab FAQ: Testbed Operations: How do I find out about ethernet devices on Linux?
Emulab FAQ: Testbed Operations: How do I find out about ethernet devices on Linux?
Use mii-tool to find out about carrier and so on.
This utility checks or sets the status of a network interface's Media Independent Interface (MII) unit. Most fast ethernet adapters use an MII to autonegotiate link speed and duplex setting.