Wol

Enable WOL

1. Check BIOS setting for Wake on LAN is enabled.
2. Check Power-Settings in BIOS (e.g. Dell Optiplex) to NOT disable Power for Network-Cards
   in OFF or Suspend mode.

software

on debian install wakeonlan or wol on REDHAT/CentOS

run:

# wakeonlan <MAC address>
Sending magic packet to 255.255.255.255:9 with <MAC address>

build magic packet (perl)

foreach (split /:/, $hwaddr) {
   $pkt .= chr(hex($_));
}
$pkt = chr(0xFF) x 6 . $pkt x 16;