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ethtool： 显示网络端口设置功能；Linux下用于查询及设置网卡参数的命令。

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[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；
ethtool 设置网卡的协商模式；

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；