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What is wake on lan??? wen it is used??
is it possible to reboot a system using wake on lan??
if possible den how it goes?
what are the hardware requirements to support wake on lan???
how to reboot a system without use of wake on lan???

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A short, practical primer that expands on 's questions and 's note.

Wake-on-LAN (WoL) uses a "magic packet" the network adapter listens for while the host is in a low‑power state. The packet contains 6 bytes of 0xFF followed by 16 repetitions of the target MAC address. Because the NIC must remain powered, WoL can power on or resume a machine from sleep/soft‑off but does not send a graceful reboot command to an OS that is already running. For restarting a live system use in‑band commands (SSH, PowerShell, RDP) or out‑of‑band management (IPMI, Intel AMT).

Requirements and behavior to keep in mind:

  • The motherboard/PSU must provide standby power to the NIC and firmware must allow wake events; OS/driver power options must permit wake.
  • Wireless wake (WoWLAN) is limited to some adapters and usually only works from sleep, not a full power‑off.
  • The magic packet is normally sent as a UDP datagram (commonly ports 7 or 9) or as a raw Ethernet frame; the payload (MAC pattern) is what matters.

Quick checklist and troubleshooting:

  • Find the target MAC, enable WoL in firmware and the NIC driver, test from another machine on the same subnet with a WoL utility.
  • If you need to wake across subnets, either enable directed broadcast support on the router (many block this) or run a small relay/agent on the target LAN to resend the magic packet.
  • Check LEDs/PSU standby and remember laptops with the battery removed or systems completely unplugged cannot be woken.

Protocol details and format are documented here: Wake-on-LAN.

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Member Avatar for pinky.shet

please tell me the code in java to get ip address of all systems,routers and printers on LAN .

Member Avatar for ryan461

WoL requires certain network properties. It needs to be enabled in the motherboard settings. If its not there, the motherboard does not support wake on lan, which means no remote boot.

Member Avatar for pinky.shet

what are the features which are required for wake on lan??
is der any interupt we hav to send to do so..

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