In Ubuntu or Debian Linux, you can install the ethtool utility to display and set Ethernet device settings by using the following command:
sudo apt-get install ethtool
After installing ethtool, you can use it to display the settings of an Ethernet device, such as eth0, by using the following command:
ethtool eth0
This will display various settings for the eth0 device, including the link speed and duplex, Wake-on-LAN settings, and more.
To set a specific setting for an Ethernet device, you can use the ethtool command followed by the desired setting and the value. For example, to set the speed of the eth0 device to 1000 Mbps, you can use the following command:
ethtool -s eth0 speed 1000
Note: Some settings may not be changeable due to hardware or driver limitations.
With ethtool, you can perform various tasks such as checking the link status, testing the network connection speed, and more.