linux 网卡模式设置 mii-tool 和ethtool

mii-tool  更改网络接口协商的方法；

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

＊ 实例一：查看网络接口的协商状态；

[root@localhost ~]# mii-tool -v eth0

eth0: negotiated 100baseTx-FD, link ok

 product info: vendor 00:00:00, model 0 rev 0

  basic mode:    autonegotiation enabled

 basic status: autonegotiation complete, link ok

 capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

 advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

 link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

注 ：上面的例子，我们可以看得到是自动协商。注意红字的部份；

＊ 实例二：更改网络接口协商方式；

更改网络接口的协商方式，我们要用到－F选项，后面可以接 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD等参数；

如果我们想把网络接口eth0改为 1000Mb/s全双工的模式应该怎么办呢？

[root@localhost ~]# mii-tool -F 100baseTx-FD

 

[root@localhost ~]#mii-tool -v eth0

eth0: 100 Mbit, full duplex, link ok

 product info: vendor 00:00:00, model 0 rev 0

 basic mode:    100 Mbit, full duplex

 basic status: link ok

 capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

 advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

注：是不是已经改过来了？当然，我们也一样用ethtool 工具来更改，比如执行下面的命令；

 

[root@localhost ~]# ethtool -s eth0 speed 100 duplex full

0 2 、 ethtool  工具关于网络协商功能介绍；

ethtool - Display or change ethernet card settings（ethtool 是用来显示和更改网卡设置的工具）；这个工具比较复杂，功能也特别多。由于洋文比较难懂。所以我们还是把网络设备协商方式的设置方法说一说。

2.1 ethtool  显示网络端口设置功能；

这个功能比较好办。就是ethtool 后面直接接网絽接口就行；比如下面的例子；

 [root@localhost ~]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP MII ]
        Supported link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes: 10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: No 注：自动协商关闭
        Speed: 100Mb/s 注：速度 100Mb
        Duplex: Full 注：全双工
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes 注：eth0已经激活；
 

在ethtool的-h帮助中我们查看到有这样的帮助信息；
 
ethtool -s DEVNAME 
                [ speed 10|100|1000 ] 
                [ duplex half|full ] 
                [ port tp|aui|bnc|mii|fibre ] 
                [ autoneg on|off ] 
 

＊ 实例一： 把网卡eth0 速度改为10Mb/s，采用半双工；

[root@cuc03 beinan]# ethtool -s eth1 speed 10 duplex half

[root@cuc03 beinan]# ethtool eth1

Settings for eth1:

        Supported ports: [ TP MII ]

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

                                100baseT/Half 100baseT/Full

        Supports auto-negotiation: Yes

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

                                100baseT/Half 100baseT/Full

        Advertised auto-negotiation: No

        Speed: 10Mb/s 注：速度 10M/s

        Duplex: Half 注：半双工

        Port: MII

        PHYAD: 32

        Transceiver: internal

        Auto-negotiation: off

        Supports Wake-on: pumbg

        Wake-on: d

        Current message level: 0x00000007 (7)

        Link detected: no 注：eth1没有激活；

＊ 实例二： 把网卡eth0 速度改为100Mb/s，采用全双工；

[root@cuc03 beinan]# ethtool -s eth1 speed 100 duplex full

[root@cuc03 beinan]# ethtool eth1

Settings for eth1:

        Supported ports: [ TP MII ]

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

                                100baseT/Half 100baseT/Full

        Supports auto-negotiation: Yes

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

                                100baseT/Half 100baseT/Full

        Advertised auto-negotiation: No

        Speed: 100Mb/s 注：速度 100M/s

        Duplex: Full 注：全双工

        Port: MII

        PHYAD: 32

        Transceiver: internal

        Auto-negotiation: off

        Supports Wake-on: pumbg

        Wake-on: d

        Current message level: 0x00000007 (7)

        Link detected: no 注：eth1网卡没有激活；

本文转自zcm8483 51CTO博客，原文链接:http://blog.51cto.com/haolun/993117