Power management/Ethernet

This article describes the setup of power management of Ethernet devices.

Disable Wake On LAN
With Wake On LAN (WOL) the computer's network card will remain powered to monitor for a 'magic' packet that will instruct it to wake the computer. To save some power WOL can be disabled.

is needed in order to perform this action if it's not already installed:

The current WOL setting can be checked with:

Disable WOL via:

BIOS
Motherboards with on-board Ethernet devices usually have an option to disable WOL (if it's supported at all) in the BIOS.

Permanent Change
Add the following string to the configuration file to disable WOL for a specific network interface using ethtool:

or using a Systemd link file.

Throttle Gigabit-Ethernet
Gigabit-Ethernet needs more power than Fast-Ethernet. If you don't use the greater bandwidth, you can throttle your connection to Fast-Ethernet. For it install :

Now you can throttle the connection:

If you want to always throttle the connection, add command to ethtool_change_INTERFACE string in /etc/conf.d/net file.