[ethtool] How to use ethtool

sudo ethtool eth0
[sudo] password for freeman:

Settings for eth0:

    Supported ports: [ TP MII ]

    Supported link modes:   10baseT/Half 10baseT/Full

                            100baseT/Half 100baseT/Full

                            1000baseT/Half 1000baseT/Full

    Supports auto-negotiation: Yes

    Advertised link modes:  10baseT/Half 10baseT/Full

                            100baseT/Half 100baseT/Full

                            1000baseT/Half 1000baseT/Full

    Advertised pause frame use: No

    Advertised auto-negotiation: Yes

    Link partner advertised link modes:  10baseT/Half 10baseT/Full

                                         100baseT/Half 100baseT/Full

                                         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)

    Link detected: yes (This is show interface online now)