These unwanted wake-up events may occur in especially noisy environments such as enterprise networks. However, in some networks, network traffic may wake up a remote computer by mistake. Such protocols do not use these packets to wake computers. For example, routers use ARP packets to periodically confirm the presence of a computer. However, some networking protocols use these packets for other purposes. In most cases, a wake-up pattern or a Magic Packet enables remote access to a computer that is in a power-saving state. An IPv6 Neighbor Discovery packet for the network adapter's solicited-node multicast addressA Magic Packet can also wake a remote computer.Ī Magic Packet is a standard wake-up frame that targets a specific network interface.An Address Resolution Protocol (ARP) packet for the IPv4 address of the network adapter.A NetBIOS name resolution broadcast for the local computer name.A directed packet to the MAC address of the network adapter.By default, Windows 7 and Windows Vista listen for the following packets when you enable WOL: One kind of special data packet contains a wake-up pattern. WOL wakes the computer if it receives a special data packet. When you enable WOL, the network adapter continues listening to the network when the computer is asleep. In Windows 7 and in Windows Vista, the WOL feature can wake a remote computer from a power-saving state such as sleep. ↳ ThinkPad X20/X30/X40 Series incl.This article explains why unwanted wake-up events occur when you enable the Wake On LAN (WOL) functionality in Windows 7 and in Windows Vista, and describes how to configure the computer to wake only in response to a Magic Packet.Īpplies to: Windows 7 Service Pack 1 Original KB number: 941145 Introduction.↳ ThinkPad SL and L Series until L420/L520.↳ Forum Notices, Questions and Suggestions.FORUM RULES, HOW-TOs and FREQUENTLY ASKED QUESTIONS.However, the adapter will only awaken in response to ARP packets querying the first IP address in the list, usually the first address assigned to the adapter. If multiple IP addresses are assigned to an adapter, the operating system may request to wake up on ARP patterns querying any of the assigned addresses. Magic Packets - accept only patterns containing 16 consecutive repetitions of the adapter's MAC address.ĭirected and Magic - accepts the patterns of both directed packets and magic packets.Ĭhoosing "Directed Packets" will also allow the adapter to accept patterns of the Address Resolution Protocol (ARP) querying the IP address assigned to the adapter. ![]() OS Controlled - accept all the patterns sent by the OS.ĭirected Packets - accepts only patterns containing the adapter's Ethernet address in the Ethernet header or containing the IP address, assigned to the adapter, in the IP header. For more information on Ethtool, see the following Web site. For Red Hat Linux, WoL is provided through the Ethtool* utility. You can configure the driver to the following settings using Intel PROSet for Windows. ![]() The wake up capability of Intel adapters is based on patterns sent by the OS. ![]() I found following for further readings here.
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