Wake a lan server with NetworkManager

References

Launch scripts based on network location

Goal

I want to start my NAS when my desktops are started so I could do some backup and use the global storage (Music, Videos, Pictures...).

How-to

The NAS is ready to accept WOL signal (in the BIOS settings).

To accomplish this task, I am using etherwake on each of my linux boxes.

etherwake -i interface mac_address

This command is encapsulated in a script shell called by the NetworkManager dispatcher. The location is :

/etc/NetworkManager/dispatcher.d/

The script receive two parameters, the interface (eth0 for example) and the status of this interface (up or down).

The command /sbin/ip addr show $IF to $NETMASK return the settings of the network interface $IF if it is within the subnet described with $NETMASK.

Here is the script that I use :

::: bash
#!/bin/sh

# Send a magic packet when an interface comes up, to allow it to start
# the remote server with the MAC address.

set -e

PATH=/sbin:/bin:/usr/sbin

IF=$1
STATUS=$2
MAC=00:11:22:33:44:55

if [ "$IF" = "eth0" ] && [ "$STATUS" = "up" ]; then
  #LAN Subnet at home
  NETMASK="10.0.0.0/8"
  if [ -n "`/sbin/ip addr show $IF to $NETMASK`" ]; then
    if [ -e /usr/sbin/etherwake ]; then
      /usr/sbin/etherwake -i $IF $MAC
      exit $?
    fi
  fi
fi