![]() ![]() To conserve energy, the link speed is typically maintained at the lowest speed possible (a Gigabit Ethernet NIC, for example, only supports a 10 Mbit/s link). In comparison to typical running power, this uses very little standby power. Though there are few exceptions, Wake-on-LAN can function across any network with the proper hardware and settings, including remote wake-up via the Internet.Ī portion of the network interface must remain on for Wake-on-LAN to function. Wake-on-LAN can typically only be used within the present network subnet because it is based on broadcast technologies. The magic packet is delivered using the data link layer (layer 2 in the OSI model) and, after being sent, is broadcast to all attached devices on a specific network using the network broadcast address the IP address (layer 3 in the OSI model) is not used. In the same way as hitting the power button would, the NIC alerts the computer's power supply or motherboard to commence system wake-up if a magic packet is received that is addressed to the device's MAC address. Network devices on powered-down or off computers with Wake-on-LAN capabilities will be able to "listen" to incoming packets while the machine is powered down. The target computer's MAC address, an identifying number built into each network interface card ("NIC") or another ethernet device in a computer that enables it to be specifically identified and addressed on a network, is contained in the magic packet. A specially created frame known as a magic packet, which is distributed to every computer on a network, including the computer that has to be awakened, is used to implement WoL. The Magic Packet: How Wake-on-LAN Worksįrames transferred between computers form the basis of Ethernet connections, which include wireless data networks, home, and office networks, and the Internet itself. Like hitting the power button, the NIC notifies the computer's power supply or motherboard to commence system wake-up if a magic packet is received that is addressed to the device's MAC address. Network devices that can "listen" to incoming packets when the system is powered down are present on powered-down or off systems that support Wake-on-LAN. The network interface card ("NIC") or other ethernet devices in a computer are individually equipped with an identification number known as a MAC address that allows them to be uniquely identified and addressed on a network. ![]() Vendors frequently add new features to the WoL and WoWLAN standards to offer protocol-transparent on-demand services, such as the Apple Bonjour wake-on-demand (Sleep Proxy) capability.Ī specially created packet known as a magic packet is used to implement wake-on-LAN (or "WOL"), and it is transmitted to all computers in a network, including the one that needs to be awakened. A second standard known as Wake on Wireless LAN (WLAN) must be used if the computer that needs to be awakened is communicating via Wi-Fi. Other terms are interchangeable, including wake on WAN, remote wake-up, power on by LAN, power up by LAN, resume by LAN, resume on LAN, and wake up on LAN. ![]() By utilizing subnet-directed broadcasts or a WoL gateway service, it is also possible to start the message from a different network. Wake-on-LAN (WoL or WOL) is an Ethernet or Token Ring computer networking protocol that enables a machine to be turned on or awakened by a network message.Īn application running on a device connected to the same local area network often sends the message to the target machine. Other terms are interchangeable, including wake on WAN, remote wake-up, power on by LAN, power up by LAN, resume by LAN, resume on LAN, and wake up on LAN. ![]()
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