How do I change network interface settings in Linux?

[petulia3478]

To change network interface configuration such as speed, duplex or negotiation, do the following, as root:

# ethtool -s eth0 speed 100

This will change the speed of interface eth0 to 100

# ethtool -s eth0 duplex full

This will set the duplex to full (as opposed to half) on interface eth0

# ethtool -s eth0 autoneg off

This will turn autonegotiation off for interface eth0