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ARK-3403 User Manual
Appendix B
A
pplication
Notes
B.1.3
How it works
Wake-on-LAN is not restricted to LAN (Local area network) traffic.
The general process of waking a computer up remotely over a network connection
can be explained thusly:
The target computer is shut down (Sleeping, Hibernating or Soft Off, i.e. ACPI state
G1 or G2), with power reserved for the network card. The network card listens for a
specific packet, called the "Magic Packet." The Magic Packet is broadcast on the
broadcast address for that particular subnet (or an entire LAN, though this requires
special hardware and/or configuration). When the listening computer receives this
packet, the network card checks the packet for the correct information. If the Magic
Packet is valid, the network card turns on the computer to full power and boots the
operating system.
The magic packet is sent on the data link or OSI-2 layer and broadcast to all NICs
(within the network of the broadcast address). Therefore, it does not matter whether
the remote host has a fixed or dynamic IP-address (OSI-3 layer).
In order for Wake on LAN to work, parts of the network interface need to stay on. This
increases the standby power used by the computer. If Wake on LAN is not needed,
turning it off may reduce power consumption while the computer is off but still
plugged in.
B.1.4
Magic Packet
The Magic Packet is a broadcast frame containing anywhere within its payload 6
bytes of ones (resulting in hexadecimal FF FF FF FF FF FF) followed by sixteen rep-
etitions of the target computer's MAC address.
Since the Magic Packet is only scanned for the string above, and not actually parsed
by a full protocol stack, it may be sent as a broadcast packet of any network- and
transport-layer protocol. It is typically sent as a UDP datagram to port 0, 7 or 9, or, in
former times, as an IPX packet.
Summary of Contents for ARK-3403
Page 1: ...User Manual ARK 3403 ...
Page 10: ...ARK 3403 User Manual x ...
Page 11: ...Chapter 1 1 General Introduction This chapter gives background Information on ARK 3403 series ...
Page 30: ...ARK 3403 User Manual 20 ...
Page 31: ...Chapter 3 3 BIOS Settings This chapter introduces how to set BIOS configuration data ...
Page 53: ...Chapter 4 4 Software installation This chapter introduces driver installation ...
Page 65: ...Appendix A A Function Settings ...
Page 68: ...ARK 3403 User Manual 58 ...