Pario TechnoBlob » ethtool http://pario.no A cronological documentation test project, nothing serious, really! Thu, 02 Feb 2012 13:17:58 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Change ethernet settings using ethtool http://pario.no/2010/01/19/change-ethernet-settings-using-ethtool/ http://pario.no/2010/01/19/change-ethernet-settings-using-ethtool/#comments Tue, 19 Jan 2010 12:14:47 +0000 Hans-Henry Jakobsen http://pario.no/?p=1283 Force network speed on a network card to 100 MBit Full Duplex and in the same time disable auto negotiation

# ethtool -s eth0 speed 100 duplex full autoneg off

These settings are active until you reboot the machine or restart the network.

In order to keep this change on each system reboot, append the following line in the following Redhat file /etc/sysconfig/network-scripts/ifcfg-eth0

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

An alternative tool to use to change the settings is mii-tool.

]]> http://pario.no/2010/01/19/change-ethernet-settings-using-ethtool/feed/ 0 Determine which interface is eth0 http://pario.no/2008/03/02/determine-which-interface-is-eth0/ http://pario.no/2008/03/02/determine-which-interface-is-eth0/#comments Sun, 02 Mar 2008 21:57:23 +0000 Hans-Henry Jakobsen http://pario.no/2008/03/02/determine-which-interface-is-eth0/ It can sometimes be difficult to determine which networcard is eth0, eth1 and so on. A easy way to determine it is to use the ethtool command

ethtool -p eth0 10

This makes the network cards LED blink for 10 seconds, and this happens without interrupting the network traffic.
You do offcourse need physical access to the server to actually see that the LEDs blink :)

To install this tool in Debian you have to run the command

apt-get install ethtool
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