Configuring remote switching on of a computer over a network. WoL (Wake-On-LAN), methodology and principles of use, setup and rake

Technology remote activation(Wake on LAN) must be a supported BIOS and network card. Also, we will need special application, the functions of which allow you to send a WOL packet to a remote PC.

Thanks to modern advances, you can turn on a remote PC not only from another computer, but also from your phone. It is also necessary to remember that turning on the computer remotely requires the activity of the network card - it must receive power in standby mode.

Preparatory actions

First of all, you need to configure the BIOS and network adapter to wake up. It doesn’t matter what kind of network it is - built-in or external. Opening main program I/O, let's find the section responsible for power management - Power Management, for example.

In this section you need to find the wake-up parameters.

These parameters can go by different names, including Wake on LAN, PowerOn By PCI Card, WOL from Soft-Off, and so on. This option must be enabled.

It is quite possible that you will need to enable the option in the picture below.

To be more confident, it's best to familiarize yourself with all the wake-up options in your BIOS. After all, the computer can wake up from the TV tuner if the option to turn on via PCI-Express is enabled, and after pressing any key on the keyboard if the options related to the PS/2 port are enabled. In our case, we need a parameter associated with the PCI bus on which the built-in network controller is located.

After setting up the BIOS, be sure to check whether the technology being discussed is supported by your Ethernet controller. We will need to enable the reception of the “magic” WOL packet so that the Ethernet controller is configured to wait for it. A WOL packet is a special Ethernet frame consisting of a sequence of bytes containing the MAC address of the network card. Having received such a frame, the Ethernet card generates a signal to wake up the PC.

So, let's open the network control center.

Let's open properties network adapter.

Let's move on to its settings.

Let's enable WOL Magic Package and, if necessary, enable Energy Efficiant Ethernet, Termination Wakeup.

Let's go to the power management tab, where this configuration should be.

WakeMeOnLan

Let's use a small program called Wakmeonlan for our purposes. This application does not require installation. After it starts, you need to scan the local network so that Wakemeonlan finds all network devices.

It must work on a PC from which a WOL frame will be generated to turn on the remote PC. This is how Wakemeonlan scans:

If during scanning the application does not detect a disabled at the moment computer, then it is possible to add it yourself.

Let's add another device manually.

You just need to enter the IP address of this device and its MAC into the form.

Let's determine the addresses we need, for which we'll launch the command line.

Let's run ipconfig with the /all key.

The second way is to look at the “Adapter Status”.

Open the Details window.

Let's find the addresses that interest us.

By adding required device, update the list.

As you can see, we already have three devices.

After adding, you can easily turn it on remotely by clicking the “Wake up Selected Computer” button.

Let's use TeamViewer

Completed pre-setting will allow you to launch the Wake on LAN function of an application such as TeamViewer. To remotely wake up your PC, you must ensure the following:

Cable Internet connection.

The computer is set to one of the modes: hibernation, sleep, or soft shutdown (Start and Shutdown).

Installed TeamViewer.

It's very important to turn off quick start in operating systems such as Windows 8 and 10. Your instances of TeamViewer must be associated with a program account. In this case, all devices must belong to the same LAN.

In the application options tab, you need to activate the Wake-on-LAN function and configure the configuration by clicking the button of the same name. By selecting the option “Other applications in the same local network", add the TeamViewer ID of those devices from which you are allowed to wake up this computer. To create inclusion conditions using a public IP address, you will have to connect to dynamic DNS, which will also have to be configured on the network router. Let's consider all the steps in order.

First of all, let's connect all computers to an existing account.

Warning window about the need to connect to your account.

Linking using the “Link” button.

The established connection is displayed at the bottom.

We will need to configure the Wake on Lan function.

Check the box for other TeamViewer applications.

Add the TeamViewer ID whose computer will send the WOL packet.

You can wake up a remote PC from your account TeamViewer, where all devices linked to it are displayed. You just need to press a button in the form of a power button, which will send a WOL frame to the Ethernet card of the selected electronic device.

Brief summary

To turn on your PC remotely from another device, you need to configure the BIOS and Ethernet card. In the BIOS you will need to configure a policy for waking up the PC by a network signal, which is in an active state, provided by standby power. Also, you need to configure the Ethernet controller to receive WOL packets. You will also need a special program to generate a WOL package. Such a program could be, for example, Wakemeonlan or TeamViewer.

1. You ran out of the house in the morning and forgot to turn on your computer in order to maintain your Torrent rating?
2. Have you once again run out of the house, and when you come to work you remember that you still have the necessary files on your home PC? or vice versa.
3. Did your power turn off and your PC, Server, etc... turned off? but do you need them in working order?
4. Any other critical incident that happened to you on the road.
This article will talk about how, using Wake On LAN, which has been present in almost all BIOS since 2002, you can turn on your computer over a network or via the Internet.
From another PC or mobile device.

What you need to have

• ATX motherboard with WOL connector;
• Network card with WOL support;
• BIOS with WOL support, also WOL must be enabled;

Network Card Configuration

If the lights do not light up, do the following:
Start - Control Panel - Network Connections, Select the active network card, go to its properties, then " Tune".
- If there is an NDIS Version item, - Select “NDIS X” (the default may be Auto), where X is the version of the Network Driver Interface corresponding to your operating system;
- Here you can also enable Wake on Magic Packet

Save the changes, restart the PC, then turn it off and check if the lights on the Network card are on.

Remote work from PC

If you are using a router you need to configure redirection of broadcast messages on some port to your computer.

WakeOnLan Broadcast
Enable: yes
IP Address: Your internal broadcast address
Protocol: UDP
Private Port: 9
Public Port: 9
Schedule: Always

If you are not using a router, then it’s enough to know your external (dedicated IP) and open port 9 in the firewall. and use WOL from any device, for example an iPhone, after specifying the details of the PC to be turned on.

UPD: V lately I don’t have a Mac at hand, and I can’t check everything myself, so for those who need information on WOL for MAC OSX, read

Modern technologies are becoming more and more convenient, for example, turning on the computer we need, while being kilometers away from it without pressing a button. Wake-on-LAN has been around for a long time, so let's take a look at how it works and how to enable it.

What is Wake-on-LAN?

Wake-on-LAN is an industry standard protocol for turning on (waking up) computers remotely that have standby power. The definition of standby power is a mode in which the computer is turned off, but the indication on the motherboard indicates that it has power and at the same time it has the ability to start the power supply. The same protocol allows you to organize an additional feature: Wake-on-Wireless-LAN - waking up from a wireless network.

Wake-on-LAN depends on two things: your motherboard and network card. Your motherboard must be connected to an ATX-compatible power supply, which is the case in most cases. Your network or wireless network card should also support this functionality. Since this feature is configured in the BIOS and in the network card, there is no need for additional special software to enable it. Computer support for Wake-on-LAN is very common, even for older models. However, in newer computer models you can find in the BIOS additional options which will help you turn on your computer specific schedule or time. This, of course, is not technically Wake-on-LAN, but it further expands the functionality of the computer.

If you assembled the computer yourself, then know that a discrete network card also requires connecting a special 3-pin cable to the motherboard to support the Wake-on-LAN function.

Magic package.

Computers with the Wake-on-LAN function enabled, in order to turn on, wait for a special “magic packet” from the network, which will contain their own MAC addresses. This magical package can be sent with either operating system on a different platform, and from a website or router. Typical ports that are used for Wake-on-LAN are UDP 7 and 9. Since the computer “listens” to the network for the appearance of a magic packet, it consumes energy, although it is small, but it does consume it, which can negatively affect the battery level in the laptop . Therefore, if you are somewhere on the road and you do not need this function at that moment, then you need to make sure that it is disabled.

The magic packet is usually sent to the network itself and contains various sub-network information, the network broadcast address and the MAC address of the network adapter of the desired computer. Moreover, it makes no difference what kind of adapter it is, wired or wireless. The picture above shows the result of the packet catching utility, which was used to catch the magic packet. This example shows how safe it is to use unsecured networks and the Internet. Many motherboard manufacturers, along with the Wake-on-LAN function, provide specialized software to simplify the setup and use of this function.

How to enable Wake-on-LAN.

BIOS

Most older computers, as well as many modern ones, contain a Wake-on-LAN setting in the BIOS. Depending on the type or model of the motherboard, it is possible to get into the BIOS by pressing the F2 or Del key during boot. The Wake-on-LAN settings should be in the following BIOS menus: Power Management or Advanced Options, or something like that.

Although there are computers that do not have the Wake-on-LAN setting in the BIOS, this does not always mean that they do not support it. It happens that you simply need to enable this function in the operating system itself.

Windows

Click the Start key and search for “Computer Management.” Find your network adapter from the list of devices.

Right-click on it, select “Properties” from the menu, and then find the “Advanced” tab.

Scroll down the list and find the next item “Wake on Magic Packet” or something like that, and set the value to “Enabled”. Click on the OK button when finished.

OS X

Open the window System Settings» (System Settings) and select Energy Saver.

In the Options tab you should see the phrase “Wake on Ethernet” or something similar. This option enables the Wake-on-LAN feature.

Linux

Ubuntu has an excellent utility that will help you determine whether your motherboard supports Wake-on-LAN and, if so, enable it. Launch a terminal and install the "ethtool" utility using the following command:

sudo apt-get install ethtool

You can check whether Wake-on-LAN can be enabled using the command:

sudo ethtool eth0

Where eth0 is the name of your network interface that you use by default.

Look at the section called "Supports Wake-on" (it's 3rd from the bottom). If you see the letter “g” opposite, this means that you can use the Magic Package for the Wake-on-LAN function. To enable it use the following command:

sudo ethtool -s eth0 wol g

After that, enter the previous command to check whether the Wake-on-LAN feature is now connected. Look at the "Wake on" section (it's 2nd from the bottom), you should now see a "g" instead of a "d".

Sending a Magic Package.

To submit an inducement request, you need to know some parameters.

Namely: this is directly the MAC address of the computer, its Internet address or host name, as well as the subnet mask where this computer is located. And you must know and enter the port number that the switched off remote computer is “listening to.”

You can download the program for sending a Magic Package using the following link:

Turn on your computer remotely, over a network or via the Internet - Wake On Lan

Any modern network card and motherboard BIOS support technology that allows you to turn on this computer remotely.

How WOL works

When the function is enabled, the computer, which is turned off normally (not in emergency mode), continues to supply standby power (5V with a small current) to the network card, which is in standby mode for just one packet - Magic packet(magic package). Upon receiving this packet, the network card sends a signal to turn on the computer.

You can transfer this package using special program, for example WOL v2.0.3, or PHP script.

Setting up the computer to turn on

In the computer BIOS we enable Wake On Lan technology, this option is located in the power management section, and can be called (set to Power-On), Wake Up On LAN (to Enabled), Wake on LAN from S5 (to Power-On ), or ERP Support (to the Disabled position).

Now, turning off the computer in the normal way, it will wait for the magic packet and turn on after receiving it.

How to send a magic package

To send the magic packet and then turn on the computer, you need to know MAC address(physical address) of the network card of the computer being turned on ().

Since a switched off computer simply cannot have any IP address, it can only receive the packet in broadcast mode. A switched off computer also cannot respond to a TCP packet that requests a connection on the port and therefore, it is logical to assume that the packet must be UDP(although that doesn't matter). Port of destination in in this case not important, the network card will accept the magic packet on any port, but it is generally accepted 7th and 9th ports, the default ports for WOL. From the above it follows that the computer being turned on and the computer from which the packet is sent must be on the same network, otherwise the broadcast packet will most likely not leave the router (we’ll talk about turning on via the Internet later).

As mentioned earlier, you can send a magic packet using a special program in which you only need to enter the MAC address of the computer you are turning on and its IP to create a broadcast on this network. For example, if the computer’s IP is 192.168.1.10, then the program will send to this IP and to the broadcast 192.168.1.255. And if you need to organize the switching on of computers online (via a browser), then this can be done using a PHP script.

Wake On Lan via the Internet

If you have direct connection to the Internet (via DHCP) and a dedicated IP address, and if your provider supports routing of broadcast packets, then your computer can be enabled to send a magic packet to the broadcast of your network, for example, your IP is 37.37.37.59, then you need to send the packet to the address 37.37 .37.255.

But in most cases, for one reason or another it won't work, then you must have a router. A router connects to the Internet, and your computer connects to this router via cable. In this situation, the magic packet must be sent not broadcast, but to the external IP address of the router. And in the router you need to create a rule (port forwarding) in which to register the forwarding of the desired port (by default 7 and 9 for a magic packet, although you can send to any) from the WAN to the LAN to the broadcast, that is, to XXX.XXX.XXX.255 .

But unfortunately, not all routers can forward ports to broadcast; some D-link models, all Linksys and Cisco, MikroTik routers, and, in my opinion, ZyXel can do this.

Magic package structure

A Magic packet is a special sequence of bytes that is sent via UDP protocol broadcast. At the beginning of the package there is 6 bytes equal to 0xFF and then goes MAC address repeated 16 times. Let's assume that the MAC address 00:1D:7D:E5:06:E8, then the magic package will look like this (without line breaks of course):

FFFFFFFFFFFF
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8
001D7DE506E8

Currently, the development and support of the ACPI specification is carried out by the international organization UEFI Forum. The section on the ACPI specification contains a complete set of documentation, starting with version ACPI 1.0 and ending with the latest version adopted at the moment (in English).

The ACPI specification defines system states, designated Gn - global states, and Sn - sleep states, which correspond to their own level of power consumption in decreasing order. Those. condition S1 corresponds to maximum consumption, and S5- minimal.

G0(Working) - normal operation.

G1(Suspend, Sleeping, Sleeping Legacy) - the machine is turned off, but the current system context is saved, operation can be continued without rebooting. For each device, the “degree of information loss” during the process of falling asleep is determined, as well as where the information should be stored and from where it will be read upon awakening, and the time to awaken from one state to another (for example, from sleep to work state). Level of electricity consumption and depth of the “sleep” state Sn are defined as follows: