Mostly for my own edification – use “ethtool”, eg:
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1# Â ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto–negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised auto–negotiation: Yes Speed: 100Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto–negotiation: on Supports Wake–on: g Wake–on: g Link detected: yes |
You’ll note two important details about this output:
- This NIC is gig capable but is only running at 100mbs.
- I claim to be running this as root, but any good sysad should be using “sudo” instead!
Anyway, simple command, but sometimes you forget them.
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