<P> The WOL and WoWLAN standards are often supplemented by vendors to provide protocol - transparent on - demand services, for example in the Apple Bonjour wake - on - demand (Sleep Proxy) feature . </P> <P> In October 1996, Intel and IBM formed the Advanced Manageability Alliance (AMA). In April 1997, this alliance introduced the Wake - on - LAN technology . </P> <P> Ethernet connections, including home and work networks, wireless data networks and the Internet itself, are based on frames sent between computers . Wake - on - LAN ("WOL") is implemented using a specially designed frame called a magic packet, which is sent to all computers in a network, among them the computer to be awakened . The magic packet contains the MAC address of the destination computer, an identifying number built into each network interface card ("NIC") or other ethernet device in a computer, that enables it to be uniquely recognized and addressed on a network . Powered - down or turned off computers capable of Wake - on - LAN will contain network devices able to "listen" to incoming packets in low - power mode while the system is powered down . If a magic packet is received that is directed to the device's MAC address, the NIC signals the computer's power supply or motherboard to initiate system wake - up, in the same way that pressing the power button would do . </P> <P> The magic packet is sent on the data link layer (layer 2 in the OSI model) and when sent, is broadcast to all attached devices on a given network, using the network broadcast address; the IP - address (layer 3 in the OSI model) is not used . </P>

What is a magic packet for wake on lan
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