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1.1.3. Ethernet Interface Settings
ethtool is a program that displays and changes Ethernet card settings such as auto-negotiation, port speed, duplex mode, and Wake-on-LAN. The following is an example of how to view supported features and configured settings of an Ethernet interface.
sudo ethtool eth4
Settings for eth4: Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full Supported pause frame use: No
Supports auto-negotiation: No Supported FEC modes: Not reported
Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Advertised FEC modes: Not reported Speed: 10000Mb/s
Duplex: Full Port: FIBRE PHYAD: 0
Transceiver: internal Auto-negotiation: off Supports Wake-on: d Wake-on: d
Current message level: 0x00000014 (20) link ifdown
Link detected: yes