linux下用mii-tool和ethtool 查看网线是否正确连接到网卡

输入mii-tool可以查看网线是否连接到网卡

mii-tool

eth0: negotiated 100baseTx-FD, link ok

有时驱动可能不支持会出错下列错误

mii-tool

SIOCGMIIPHY on 'eth0' failed: Operation not supported

no MII interfaces found(用sudo su切换到超级管理员用户状态就可以用了。)

可以使用ethtool查看

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: 0

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: pumbg

Wake-on: g

Current message level: 0x00000033 (51)

Link detected: yes

Link detected: yes为正常no为失败

mii-tool 的用法:

mii-tool 在更改网络设备通信协商方式的方法比较简单，用 -v 参数来查看网络接口的状态；看下面的例子；

mii-tool 更改网络接口协商的方法；

[root@localhost ~]# mii-tool --help

usage: mii-tool [-VvRrwl] [-A media,... | -F media] [interface ...]

-V, --version display version information

-v, --verbose more verbose output 注：显示网络接口的信息；

-R, --reset reset MII to poweron state 注：重设MII到开启状态；

-r, --restart restart autonegotiation 注：重启自动协商模式；

-w, --watch monitor for link status changes 注：查看网络接口连接的状态变化；

-l, --log with -w, write events to syslog 注：写入事件到系统日志；

-A, --advertise=media,... advertise only specified media 注：指令特定的网络接口；

-F, --force=media force specified media technology 注：更改网络接口协商方式；

media: 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD,

(to advertise both HD and FD) 100baseTx, 10baseT

example:

[at_Neal:root:~:]# mii-tool

eth0: negotiated 100baseTx-FD flow-control, link ok

eth1: no link

eth2: negotiated 100baseTx-FD flow-control, link ok