General Information

Display and set ethernet interface settings.

Checklist

• Distro(s): Enterprise Linux

To display the settings of a network interface:

ethtool eth0

Set eth0 to 100 Mbps and full duplex

ethtool -s eth0 speed 100 duplex full autoneg off

To make speed settings permanent, edit the network script at /etc/sysconfig/network-scripts/ifcfg-eth0 and append:

For 100 Mbps

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

For 1000 Mbps (1 Gbps)

ETHTOOL_OPTS="speed 1000 duplex full autoneg on"

• Note: Gigabit requires autoneg to be on, even though you are manually specifying speed and duplex.