Linux - как посмотреть скорость порта - ethtool

Посмотреть скорость порта на интерфейсе в Linux можно через утилиту ethtool:

# ethtool eth0
Settings for eth0:
       Supported ports: [ TP MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Half 1000baseT/Full
       Supported pause frame use: No
       Supports auto-negotiation: Yes
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Advertised pause frame use: Symmetric Receive-only
       Advertised auto-negotiation: Yes
       Link partner advertised link modes:  1000baseT/Full
       Link partner advertised pause frame use: No
       Link partner advertised auto-negotiation: Yes
       Speed: 1000Mb/s
       Duplex: Full
       Port: MII
       PHYAD: 0
       Transceiver: internal
       Auto-negotiation: on
       Supports Wake-on: pumbg
       Wake-on: g
       Current message level: 0x00000033 (51)
                              drv probe ifdown ifup
       Link detected: yes