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Ethtool
Ethtool is a command-line utility used in Linux systems to query and control network interface settings. It provides information about the network interface cards (NICs) installed on a system, such as link status, driver information, speed, duplex mode, and more, and allows you to modify certain settings of a network interface.
Using Ethtool to view network interface information
To view general information about a specific network interface (e.g., eth0), use the following command:
ethtool interface_name
If you want to retrieve only the link status of an interface, you can use the -i option followed by the interface name:
ethtool -i interface_name
Using Ethtool to change network interface settings
Ethtool allows you to modify certain settings of a network interface. For example, you can manually set the speed and duplex mode, enable or disable features like Wake-on-LAN or autonegotiation, configure flow control settings, and adjust ring buffer sizes.
Manually set the speed and duplex mode of a network interface
To manually set the speed and duplex mode of a network interface (e.g., eth0) to a specific value, use the following command:
ethtool -s interface_name speed interface_speed duplex interface_duplex
If you want to enable or disable autonegotiation on a specific interface, you can use the following command:
ethtool -s interface_name autoneg on
ethtool -s interface_name autoneg off
Enable Wake On LAN (WoL) on the network adapter
Use the following command to check if your network interface supports Wake On LAN (WoL):
sudo ethtool interface_name | grep "Wake-on"
If the output shows "Wake-on: d", it means that Wake On LAN (WoL) is disabled.
To enable Wake On LAN (WoL), use the following command:
sudo ethtool -s interface_name wol g
Make the Wake On LAN (WoL) setting persistent across reboots
To make the Wake On LAN (WoL) setting persistent across reboots, add the following line to the /etc/network/interfaces file:
post-up /usr/sbin/ethtool -s interface_name wol g