Evie Summers
TeamViewer is a software application that allows users to access files on their computers remotely. However, for TeamViewer to connect, the host computer must be turned on. TeamViewer offers a free Wake-on-LAN (WoL) tool that allows users to remotely wake up their computers from anywhere in the world, even if they are in sleep mode or hibernation mode. WoL is an industry-standard protocol that enables the remote reactivation of computers from low-power or powered-down states. It provides users with the ability to maintain, support, monitor, and access files and applications on their devices from any location, minimizing disruptions to business operations. To utilize WoL, the host computer must meet specific configuration requirements, such as having a public IP address or being connected to another computer on its network.
Can TeamViewer Work if a Computer is Asleep?
| Characteristics | Values |
|---|---|
| Can TeamViewer wake a sleeping computer? | Yes, TeamViewer offers a free Wake-on-LAN (WoL) tool that can wake a computer from anywhere in the world. |
| Requirements | The computer must support WoL, be connected to the internet via an Ethernet cable, and have the appropriate configurations. |
| Supported Devices | WoL supports TeamViewer on a wide range of operating systems and devices, including PCs and mobile devices. |
| Use Cases | Patch management, applying updates, generating reports, maintenance, support, monitoring, and accessing work applications and files from home. |
| Wake-on Values | d (disabled), p (PHY activity), u (unicast activity), m (multicast activity), b (broadcast activity), a (ARP activity), and g (magic packet activity). |
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What You'll Learn
TeamViewer's Wake-on-LAN (WoL) tool
WoL is a well-established networking protocol, originally developed by AMD and Hewlett Packard, that has been in use since the 1990s. It is an industry-standard protocol that enables the remote reactivation of computers from low-power or powered-off states. With TeamViewer Remote's built-in WoL support, users can conveniently maintain and access their machines over extended periods, regardless of their power status.
To utilize TeamViewer's WoL functionality effectively, the remote computer must have its WoL settings enabled. Additionally, the computer needs to meet certain configuration requirements. These requirements include setting up port forwarding and ensuring the router can address the specific computer even when it is turned off. Some routers may also necessitate configuring static ARP entries to associate the IP address with the MAC address of the computer to be awakened.
By leveraging TeamViewer's Wake-on-LAN tool, users gain the flexibility to manage their computers remotely, saving time and effort. It is important to refer to the specific instructions provided by TeamViewer and router manufacturers to ensure successful configuration and usage of the WoL feature.
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WoL's remote access and control capabilities
Wake-on-LAN (WoL) is a networking technology that allows users to remotely power on or wake up computers over a network connection. It is a useful feature for individuals who want to access their home computers while away and IT professionals who manage multiple computers. With WoL, users can turn on a computer in a different location without being physically present, saving time and effort.
To use WoL, a user must have a compatible device, such as a smartphone or another computer, and a network connection. The user then sends a specially crafted network packet, known as a "magic packet", to the target computer's unique identifier, typically its Media Access Control (MAC) address. This MAC address is a unique identifier assigned to the computer's network adapter. The magic packet contains the MAC address and other necessary information to wake up the target computer.
Once the target computer receives the magic packet, it checks if the MAC address matches its own. If there is a match, the computer powers on and becomes accessible over the network. The core of WoL technology is the "magic packet", which is a specially formatted frame sent over the network that includes the target computer's MAC address repeated multiple times. The magic packet is typically sent as a broadcast to all devices on the local network.
To ensure WoL functionality, the target computer's network adapter must be capable of recognizing the magic packet even when the computer is in a low-power state such as standby, hibernate, or soft off. Pretty much any modern Ethernet adapter will support WoL, but wireless adapters rarely do. If you're using a wireless adapter, you'll be able to send the magic packet over Wi-Fi, but the receiving computer will likely need to be plugged in via Ethernet.
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Requirements for WoL to work
Wake-on-LAN (WoL) is a networking protocol that allows computers to be remotely awakened from sleep mode within a local area network (LAN). WoL is implemented using a "magic packet", which contains the target computer's media access control (MAC) address and network broadcast address.
To enable WoL, the following requirements must be met:
- The computer should be connected to an ATX-compatible power supply with an extra +3.3V voltage rail, allowing it to switch between alternating and direct current power.
- An access control list (ACL) must be created and added to all routers within the network. The ACL monitors incoming and outgoing network traffic.
- The network interface card must support Wake-on-LAN. This feature is typically enabled in the Power Management section of the motherboard's BIOS/UEFI setup utility. However, it may be labelled differently or located in a different section, depending on the manufacturer.
- The computer must be connected to the network via an Ethernet cable, as WoL does not work over Wi-Fi.
- If using a laptop, ensure it is plugged into an electrical outlet, as WoL may not function on battery power alone.
- Ensure that the computer's hardware supports WoL. Some systems, especially laptops, may have hardware limitations that prevent WoL from functioning properly.
- For Windows PCs, enabling WoL in the BIOS allows the computer to wake from a powered-off state, sleep, or hibernation.
- For Mac users, select the "Wake for network access" option in the Energy Saver preferences. However, note that as of macOS 12, there are some limitations affecting the WoL feature.
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Configuring the router
To wake up a specific computer on the local network, set up port forwarding as described in the router manual from an incoming UDP port to the local IP address of the computer to be awakened. Ensure that your router can address the appropriate computer, even when it is turned off. A static Address Resolution Protocol (ARP) entry must be saved on the router, showing the IP address of the computer to be awakened on the MAC address of that computer.
Some routers automatically generate appropriate static ARP entries if a fixed IP address is reserved for the computer. In some cases, the appropriate configuration of static ARP entries cannot be achieved via the router's configuration menu, and they must be configured via Telnet or Secure Shell (SSH).
The Wake-on values define what activity triggers the computer to wake up:
- D (disabled)
- P (PHY activity)
- U (unicast activity)
- M (multicast activity)
- B (broadcast activity)
- A (ARP activity)
- G (magic packet activity)
The value "g" is required for WoL to work. If it is not listed, the following command enables the WoL feature in the driver:
> sudo apt-get install ethtool
Then, use the following command to check the Wake-on-LAN compatibility:
> sudo ethtool eth0
If "g" is listed in the "supports Wake-on" section, the functionality is available.
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Compatibility and configuration of static ARP entries
TeamViewer is a software application that allows users to access and control computers remotely. While it is possible to wake up a computer from sleep mode using TeamViewer, certain configurations are required. One critical aspect is the compatibility and configuration of static Address Resolution Protocol (ARP) entries.
Static ARP entries are used to manually associate an IP address with a specific Media Access Control (MAC) address. This is particularly useful in scenarios where the device is unable to dynamically learn the MAC address. By creating static ARP entries, you can ensure that the correct MAC address is mapped to the corresponding IP address, enabling seamless communication between devices.
To configure static ARP entries, you need to specify both the IP address and the MAC address that need to be associated with each other. The IP address must be a part of the subnet defined in the enclosing address statement. The MAC address, on the other hand, must be provided in hexadecimal byte formats: nnnn.nnnn.nnnn or nn:nn:nn:nn:nn:nn (for example, 0011.2233.4455 or 00:11:22:33:44:55). This configuration ensures that the router can accurately identify the computer you intend to wake up, even when it is turned off or in sleep mode.
In some cases, routers may automatically generate static ARP entries if a fixed IP address is reserved for a specific computer. However, if this cannot be achieved through the router's configuration menu, alternative methods such as Telnet or Secure Shell (SSH) can be employed to configure the ARP entries. Additionally, certain operating systems like Windows might require specific approaches, such as using a Startup Script to specify static ARP entries on each boot.
By properly configuring static ARP entries, you can enhance the compatibility and effectiveness of using TeamViewer to wake up a computer from sleep mode. This configuration ensures that the correct IP and MAC addresses are mapped, facilitating successful remote access and control of the target computer, even when it is in a power-saving state.
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Frequently asked questions
Yes, TeamViewer offers a Wake-on-LAN (WoL) tool that allows you to wake up your computer from anywhere in the world. WoL is a computer industry standard protocol for reactivating a computer from a low-power or sleep mode.
First, your computer must support Wake-on-LAN. Most computers manufactured in the past few years support this feature, but some can only use it to wake computers from sleep mode, not hibernation or powered-off mode. Additionally, your computer must be connected to the internet via an Ethernet cable, not Wi-Fi.
To configure Wake-on-LAN, you must ensure that your computer's NIC is supplied with power and capable of receiving broadcasted magic packets. You can check if your computer supports WoL by using a software tool installed via the terminal with the command "sudo apt-get install ethtool".
Wake-on-LAN allows you to complete tasks such as patch management, updates, and generating reports outside of work hours, minimising disruption to business users and critical processes. It also enables remote maintenance, support, and monitoring of devices, providing greater flexibility and control.
Yes, you can wake up a specific computer in your local network by setting up port forwarding from an incoming UDP port to the local IP address of the computer. Ensure that your router can address the appropriate computer even when it is turned off.
