• ethtool speed HowTo : Change Speed and Duplex of Ethernet card in Linux


    To change Speed and Duplex of an ethernet card, we can use ethtool - a Linux utility for Displaying or Changing ethernet card settings.

     

    1. Install ethtool

    You can install ethtool by typing one of the following commands, depending upon your Linux distribution.

    Install ethtool in Fedora, CentOS, RHEL etc. :
    # yum install ethtool

    Install ethtool in Ubuntu, Debian etc. :
    # sudo apt-get install ethtool

    2. Get the Speed, Duplex and other information for the interface eth0

    To get speed, duplex and other information for the network interface eth0, type the following command as root.
    # ethtool eth0
    Sample output :

    Settings for eth0:
    	Supported ports: [ MII ]
    	Supported link modes:   10baseT/Half 10baseT/Full 
    	                        100baseT/Half 100baseT/Full 
    	                        1000baseT/Half 1000baseT/Full 
    	Supports auto-negotiation: Yes
    	Advertised link modes:  10baseT/Half 10baseT/Full 
    	                        100baseT/Half 100baseT/Full 
    	                        1000baseT/Half 1000baseT/Full 
    	Advertised auto-negotiation: Yes
    	Speed: 100Mb/s
    	Duplex: Half
    	Port: Twisted Pair
    	PHYAD: 1
    	Transceiver: internal
    	Auto-negotiation: on
    	Supports Wake-on: g
    	Wake-on: d
    	Current message level: 0x000000ff (255)
    	Link detected: yes

    3. Change the Speed and Duplex settings

    The following changes are temporary and they'll stop working after reboot. Read the next section, to make settings permanent.
    The next command enables Auto-Negotiate feature :
    # ethtool -s eth0 autoneg on
    The next command disables Auto-Negotiation, enables Half Duplex and sets up Speed to 10 Mb/s :
    # ethtool -s eth0 speed 10 duplex half autoneg off
    The next command disables Auto-Negotiation, enables Full Duplex and sets up Speed to 100 Mb/s :
    # ethtool -s eth0 speed 100 duplex full autoneg off

    4. Change the Speed and Duplex settings Permanently on CentOS/RHEL

    To make settings permanent, you need to edit /etc/sysconfig/network-scripts/ifcfg-eth0 file for eth0 interface. This file is used by RHEL, CentOS, Fedora etc.
    # vi /etc/sysconfig/network-scripts/ifcfg-eth0
    Append the line as follows to disable Auto-Negotiation, enable Full Duplex and set up Speed to 100 Mb/s :

    ETHTOOL_OPTS="speed 100 duplex full autoneg off"

    Restart the interface to apply changes :
    # ifdown eth0 && ifup eth0

    zhuan: http://www.shellhacks.com/en/HowTo-Change-Speed-and-Duplex-of-Ethernet-card-in-Linux

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  • 原文地址:https://www.cnblogs.com/iclk/p/4666663.html
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