Posts tagged ethtool

Linux: Wake-On-LAN
posted on 2015-05-11 22:04:35

To get a computer to start via remote, without having someone to push the powerbutton, can easily be achieved via the NIC's wake-on-lan feature. Only prerequisites are access to a computer within the same LAN and a WOL able computer and proper setup.

NOTE: In some BIOSes or UEFIs the WOL / wake on lan feature has to be enabled explicitly.

First check if your NIC is able to do it, and which NIC you need.

Use ip a in shell, and look up your active NIC, the one containing an IP not being 127.0.0.1. :) This should be the cabled ethernet connection, as, aside from newer Mac's (Snow Leopard / OSX 10.6 and above) the trigger will not work via WIFI.

check for functionality

Then have a look at the capabilities and the current setting:

ethtool <NIC> | grep Wake

which may give you something like:

[root@jerrylee /home/jl]# ethtool eno1 | \grep Wake
        Supports Wake-on: pumbg
        Wake-on: g

If the line with Wake-on is set to d, WOL is disabled. From the manpage:

          p   Wake on PHY activity
          u   Wake on unicast messages
          m   Wake on multicast messages
          b   Wake on broadcast messages
          a   Wake on ARP
          g   Wake on MagicPacket™
          s   Enable SecureOn™ password for MagicPacket™
          d   Disable  (wake  on  nothing).  This option
              clears all previous options.

Here I have 'Wake on MagicPacket' already enabled.

enable it

ethtool --change <NIC> wol g

use it

At another host within your network, you only have to know the IP or MAC address of the machine in question, and have the wakeonlan package (debian via apt-get) or wol package (redhat derivates, via yum) installed.

Have a look at ip n, which is short for ip neigh, so you get the MAC:

root@pi:~# ip n
10.10.10.1 dev eth0 lladdr 34:31:c4:1b:1e:b7 REACHABLE
10.10.10.20 dev eth0 lladdr 70:71:bc:9d:bd:e1 STALE

You can also put a .txt file on the host, containing the MAC.

If I wanted to start the machine with the IP 10.10.10.20, I'd have to use:

wol 70:71:bc:9d:bd:e1

And the machine will boot.

This will also persist, even when using ifup / ifdown on the interface in question.

overview

To see what can trigger a boot of your machine, see here:

cat /proc/acpi/wakeup

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