Wake on LAN

AKA, Magic Packets

• Usually a UDP broadcast 255.255.255.255 frame with FF FF FF FF FF FF as it’s payload
  • Typically UDP ports 7 or UDP port 9
• 16 repetitions of the target computers 48-bit MAC Address
• Sometimes sent as a directed broadcast 10.0.0.1/24 becomes 10.0.0.255
  • Directed broadcasts require the routers be configured to allow them

Frame 1: Packet, 116 bytes on wire (928 bits), 116 bytes captured (928 bits)
Ethernet II, Src: Intel_85:cf:01 (00:90:27:85:cf:01), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Wake On LAN, MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
    Sync stream: ffffffffffff
    MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)
        MAC: Dell_dc:9e:35 (00:0d:56:dc:9e:35)

Packet courtesy of the Wiki Wireshark

References

Wake-on-LAN - Wikipedia