This tutorial will explain how to change network card speed and duplex settings in ubuntu
Using ethtool
ethtool can be used to query and change settings such as speed, auto- negotiation and checksum offload on many network devices, especially Ethernet devices.
Install ethtool in ubuntu
sudo apt-get install ethtool
You can check the current Ethernet network card speed and duplex settings using the following command
sudo ethtool eth0
Where eth0 is the Ethernet network card interface
Turn off Auto-Negotiate feature using the following command
sudo ethtool -s eth0 autoneg off
ethtool Syntax
sudo ethtool -s eth0 speed [SPEED] duplex [DUPLEX]
Example 1
This example will show you how to setup your ethernet network card speed 100 and full duplex
sudo ethtool -s eth0 speed 100 duplex full
Example 2
This example will show you how to setup your ethernet network card speed 10 and half duplex
sudo ethtool -s eth0 speed 10 duplex half