用来查询网卡信息

直接接网卡名:

19:36 tankywoo@gentoo-gs /home/tankywoo/wiki
% sudo ethtool enp2s1
Settings for enp2s1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                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: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes

Link detected 可用来检测网线是否连接。在这里被坑过，之前一直错误的理解为链路连接正常，即插上线就是yes，其实这里是指网卡是否up。

就算插上线，但是网卡没有启动，依然是no。

这个回答中@Jamie Kitson的评论也提到了这点。

-i 参数可以查看网卡驱动类型:

tankywoo@gentoo-local::~/ » sudo ethtool -i enp0s5
driver: e1000
version: 7.3.21-k8-NAPI
firmware-version:
bus-info: 0000:00:05.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no