IT/Software/Command Line Applications/wakeonlan

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General

You need to allow this in the BIOS first.

Then the computers need to be kept attached to the network and power.

Having them on a UPS is good.

Basic Usage

  • Say you are working at home.
  • You want to turn on and update all the computers
  • You can login to the main server, wake up all the desktops and they update.

Background

  • Find out who is on the lan.

sudo arp-scan 192.168.2.0/24   

Configuration

  • There are countless tutorials on how to do this.
  • Making it "persistent" is the tricky bit.
  • Install some tools
    • test

sudo apt install net-tools ethtool

  • net-tools brings ifconfig and arp which allows a LAN scan for MAC addresses

See what is enabled.

sudo ethtool interfaceName

  • for example sudo ethtool enp3s0
    • look for Wake-on and see what is supported and enabled.
    • we want "g"
  • Look what is persistent

nmcli c show jademonkeyWired | grep 802-3-ethernet.wake-on-lan

  • You will get an output like this

802-3-ethernet.wake-on-lan: magic

802-3-ethernet.wake-on-lan-password: --

  • We want "magic" not "default"
  • If not "magic" then modify it by

sudo nmcli c modify jademonkeyWired 802-3-ethernet.wake-on-lan magic

Another thing you may need to do is:

sudo ethtool -s enp1s0 wol g

  • This does not seem to be as persistent.
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