configure the network speed and duplex settings

tijo.thomas · 06-12-2006, 01:08 AM

Hi All,

How do you configure the network speed and duplex setting of an ethernet in Linux?

Can somebody help me out in this? What are the possible ways to do this??

Appreciate your helps,

acid_kewpie · 06-12-2006, 01:13 AM

well normally it should all be done automatically, but you can use ethtool and mii-tool to force these things on most cards.

penguintutor · 06-12-2006, 04:54 AM

The following commands can be used to set eth0 to 100M Full-duplex

Using mii-tool

mii-tool -F 100baseTx-FD eth0

If you want this to be applied at system startup, then you would need to add the entry to your /etc/rc.local file (or into an init.d file if you don't have an rc.local).

Using ethtool

ethtool -s eth0 speed 100 duplex full autoneg off

This can be added to /etc/rc.local as mentioned above. Alternatively if you have the file:
/etc/sysconfig/network-script/ifcfg-eth0

You can add the entry:
ETHTOOL_OPTS="speed 100 duplex full autoneg off"