Linux ethtool 命令

ethtool 是用于查询及设置网卡参数的命令，常见用法如下：

注意：该命令只是临时设置，如果网卡重启就失效了，如果想要永久保存应该配置 /etc/sysconfig/network-scripts/ifcfg-eth0 文件

 查看指定网卡的基本设置，内容包括网卡速率、网卡的工作模式等

ethtool eth0

[root@mysql ~]# ethtool eth0
Settings for eth0:
    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
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: off (auto)
    Supports Wake-on: d
    Wake-on: d
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: yes

查看指定网卡的驱动信息，内容包括驱动的型号、驱动的版本等
ethtool -i eth0

[root@mysql ~]# ethtool -i eth0
driver: e1000
version: 7.3.21-k8-NAPI
firmware-version: 
expansion-rom-version: 
bus-info: 0000:02:01.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no

[root@mysql ~]# ethtool -s eth0 speed [10|100|1000]    # 设置网卡的速率，单位是：Mb/s
[root@mysql ~]# ethtool -s eth0 duplex [half|full]     # 设置网卡的工作模式，可设置为半双工或全双工
[root@mysql ~]# ethtool -s eth0 autoneg [on|off]       # 设置网卡是否自动协商，自动协商的内容主要包括工作模式、网卡速率以及流控等参数
[root@mysql ~]# ethtool -s eth0 autoneg off speed 100 duplex full    # 也可以同时写在一起