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Wake On LAN
How can I start a computer over the network?
There are two different procedures, depending on whether the target computer is in standby/sleep/suspend mode or whether it is actually powered down in hibernate mode or entirely off.
Note that you cannot wake a computer that is powered down over a WLAN connection. Only cable connections will do.
Waking from suspend mode
Now your computer should wake up from standby whenever the network card is accessed by any other computer. If it doesn't, check any relevant BIOS settings, but usually there aren't any.
A frequent problem is that the computer is woken up by all and sundry network traffic, hence it may be better to send the computer to hibernate mode or shut it down and off altogether and use the following method.
Wake On LAN from hibernate or off mode
One way to do this is the following.
If you need the opposite function as well, to shut down a computer remotely, have a look at:
This program, PsShutdown, is a member of Sysinternals' PsTools group of freeware utilities.
To shut down and power down a remote computer named "computername", enter the command:
-k indicates shutdown and powerdown, -f means force all running programs to close without asking, and -t 00 means don't wait (wait zero seconds) until shutting down the computer named computername. (Don't miss the required space between -t and 00.) This utility can do several other things as well, like sending the target computer into hibernate mode or rebooting it.
Wake On LAN over the Internet
One example of how to wake up a home or office computer across the Internet is the following.
Assume a home network with a WAN router, in this case a DrayTek Vigor 2500We with firmware version 2.54. The main problem is that you cannot use any of the usual methods to address the target computer. Since it is off, it has no IP address. False advice is widespread, because people keep forgetting this simple fact.
The router has to send a special broadcast packet into the Local Area Network, using the MAC (Media Access Control) address, rather than the IP address. With some routers you may be able to achieve this by sending a Wake-On-LAN packet to the router and forward the port to an internal broadcast address, for example: 192.168.0.255
With most routers, however, this still does not work. You have to rely on the router to have the special ability to forward or send a Wake-On-LAN broadcast packet. In the case of the DrayTek router this can only be achieved through the telnet interface, but unfortunately not yet through the Web interface. An example for the telnet command for this DrayTek router is:
Of course you have to replace the hex number with the MAC address of your target computer, and for this particular router you cannot intersperse hyphens as usual. The router needs the address in the direct short hexadecimal format. Check your router's manual or help system for its specifics.
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