255 in the address using the default network mask signifies that the router should forward any information sent to the indicated port to all computers on the LAN side. If you are using the default settings of the router, this address would probably be 192.168.1.255. If you are using this mask, you should forward traffic destined to your WOL port to .255. The IP address the packet needs to be forwarded to changes depending on the network mask you are using on your LAN. The protocol that needs to be forwarded is UDP it is not necessary to forward the TCP protocol. Since a Machine that is not turned on doesn't have an IP address, the packet sent to wake the Machine needs to be forwarded to all Machines on the LAN side of the router in order to ensure it gets to the Machine it is intended for. To wake up a Machine over the Internet, an appropriate port needs to be forwarded from the WAN side to the LAN side of the router. The access list should be configured on all routers/gateways/switches along the Wake-on-LAN packet path.įor detailed information on configuring the access list on routers/gateways/switches, refer to the user manual provided by the hardware manufacturer. In case with Remote Shutdown Wake-on-LAN packets, you should only allow receiving UDP packets from the machine running Remote Shutdown through the port specified on the WOL Configuration preference page. To protect your network from "smurf" attacks, you may allow only certain types of Directed Broadcasts to go throw the routers/gateways/switches (i.e. By sending a continuous stream of such requests, the attacker can create a much larger stream of replies, which can completely inundate the host whose address is being falsified. In a "smurf" attack, the attacker sends ICMP echo requests from a falsified source address to a directed broadcast address causing all the hosts in the target subnet to send replies to the falsified source. This ensures that the WOL packets are not blocked.Īllowing any type of Directed Broadcast on routers/gateways/switches makes the network vulnerable to "smurf" attacks though the Internet. You may wake up remote Machines from different subnets using Remote Shutdown with the help of each of the transmission methods (Directed Broadcast and Unicast), provided a specific set of requirements is met for at least one of the methods.ĭirected Broadcast transmission method prerequisitesĪll routers/gateways/switches between the Remote Shutdown site server and the target Machines must allow Directed Broadcasts and must support the IPv4 protocol. Prerequisites of Wake-on-LAN across different subnets (or VLANs) See the Configuring remote Machines' Network Adapter for details. If you want to wake the Machines up from Sleep or Hibernate, you must make some additional network adapter settings. For example, if the machine was switched off due to a power outage, WOL will not work. That means that the AC adapter should not be turned off after the last Shut Down. The target Machine must be in the Shut Down state.The Machines should use an ATX power supply meeting the ATX 2.01 specifications. ![]() PCI adapters send and receive PME signals via a PCI socket directly, without the need for a Wake-on-LAN cable. PCI version 2.2 supports PME (Power Management Events).
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