2015-03-29 20:32:35 +01:00
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---
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title: Wake-on-LAN
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layout: default
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created: 2008-08-13 22:18:28 +0200
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updated: 2008-08-13 22:18:28 +0200
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toc: false
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tags:
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- know-how
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- software
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- linux
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- networking
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---
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Preparing to go asleep
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======================
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2015-03-29 21:05:46 +01:00
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To make Linux not shut down the network interface upon *halt*, edit the file `/etc/init.d/halt`, find the line with the
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`halt` command and remove the parameter `-i` if there. This parameter does `ifdown` on all networking interfaces. As the
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2015-03-29 20:32:35 +01:00
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manpage for *halt* states, this is unneccessary for newer kernels - also it disables WOL.
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2015-03-29 21:05:46 +01:00
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The second step is to make sure, your card supports WOL. To find out, issue the `sudo ethtool eth0` command. You should
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2015-03-29 20:32:35 +01:00
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get something like this:
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2015-03-29 20:38:11 +01:00
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~~~
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2015-03-29 20:32:35 +01:00
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Settings for eth0:
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Supported ports: [ TP MII ]
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Supported link modes: 10baseT/Half 10baseT/Full
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100baseT/Half 100baseT/Full
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Supports auto-negotiation: Yes
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Advertised link modes: 10baseT/Half 10baseT/Full
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100baseT/Half 100baseT/Full
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Advertised auto-negotiation: Yes
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Speed: 10Mb/s
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Duplex: Half
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Port: MII
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PHYAD: 1
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Transceiver: internal
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Auto-negotiation: on
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Supports Wake-on: g
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Wake-on: g
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Current message level: 0x00000007 (7)
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Link detected: no
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2015-03-29 20:38:11 +01:00
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~~~
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2015-03-29 20:32:35 +01:00
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2015-03-29 21:05:46 +01:00
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The important lines are the `Supports Wake-on` and `Wake-on` ones. The "`g`" means it is enabled for MagicPacket™.
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2015-03-29 20:32:35 +01:00
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If not, you should manually call the command:
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ethtool -s eth0 wol g
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This should enable WOL for the card. If this works, you have to issue this command after every bootup as the state will
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be back to disabled then. You might want to create a startup script.
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Waking remote PCs
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=================
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2015-03-29 21:11:15 +01:00
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The simple way is to use `wakeonlan` which only supports MagicPacket™.
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2015-03-29 20:32:35 +01:00
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For a PC in a Class C network, use a call like this:
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wakeonlan -i 192.168.1.255 de:ad:be:ef:ca:fe
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This would send the packet to the 192.168.1.x subnet and the PC with the specified MAC address should wake up.
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**Note:** Some nVidia chipsets require the MAC address to be specified in reverse order. In the example this would
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2015-03-29 21:05:46 +01:00
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be `fe:ca:ef:be:ad:de`.
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