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Ethtool
General Information
Display and set ethernet interface settings.
Checklist
- Distro(s): Enterprise Linux
Display Settings
To display the settings of a network interface:
ethtool eth0
Set Speed/Duplex
Set eth0 to 100 Mbps and full duplex
ethtool -s eth0 speed 100 duplex full autoneg off
Permanent Settings
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 thought you are manually specifying speed and duplex.