How to use ethtool?

To use ethtool, follow these general steps:

1. Open a Terminal: Access your command-line interface (CLI) on your Linux system.

2. Check if ethtool is installed: You can check if ethtool is installed by running:

   ethtool --version

   If it's not installed, you can typically install it using your package manager. For example, on Debian-based systems:

   sudo apt-get install ethtool

3. Identify your network interface: Use the ip command to list your network interfaces:

   ip link show

4. Use ethtool commands: Here are some common commands you can use with ethtool:

   • View interface settings:

     ethtool eth0

     Replace eth0 with your actual interface name.

   • Change speed and duplex settings:

     sudo ethtool -s eth0 speed 100 duplex full autoneg off

   • Enable auto-negotiation:

     sudo ethtool -s eth0 autoneg on

   • Display statistics:

     ethtool -S eth0

   • Check driver information:

     ethtool -i eth0

5. Review output: After running a command, review the output for information about your network interface or to confirm that changes were made successfully.

6. Use with caution: Some commands, especially those that change settings, may require root privileges (use sudo).

By following these steps, you can effectively use ethtool to manage and diagnose your network interfaces.