Prerequisites for Wake-on-LAN (WoL):

1. Motherboard & BIOS Support: Enable WoL in BIOS/UEFI settings.
2. Network Interface Card (NIC) Support: NIC must support WoL; enable it in device properties.
3. Ethernet Connection: WoL typically requires a wired Ethernet connection.
4. Power Supply: System should provide standby power (S5 state) to the NIC.
5. Network Configuration: Correct MAC address, subnet, and port settings for the Wake-on-LAN packet.
6. Software: Tool to send the “magic packet” (e.g., Depicus, WakeMeOnLan).

Ensure proper configuration on the OS (e.g., Windows, Linux).

1. Enable WoL on Target Device:
   • Access BIOS or OS settings of the target device.
   • Enable “Wake on LAN” (WoL).
2. Install Required Package on OpenWRT:

   opkg update
   opkg install etherwake
   

3. Send WoL Packet from OpenWRT:

   etherwake -b <MAC_ADDRESS>
   

   Replace <MAC_ADDRESS> with the target device’s MAC address.

4. Automate WoL Using OpenWRT Web UI (Optional):
   • Go to System > Startup.
   • Add a new script to send WoL command on startup. Example:

     /usr/bin/etherwake -b <MAC_ADDRESS>
     

5. Ensure Network Setup:
   • Target device must be connected to the same subnet.
   • Proper forwarding/routing if WoL is sent across subnets.
6. Alternative: Web Interface WoL Plugin
   • Install luci-app-wol:

     opkg install luci-app-wol
     

   • Access via Services > Wake on LAN on the OpenWRT web UI.

To execute the etherwake command via SSH, you can set up an alias or use the ProxyCommand option in the .ssh/config file. Here’s how:

1. Edit .ssh/config:

   vim ~/.ssh/config
   

2. Add the Following Configuration:

   Host wol-alias
       HostName <OpenWRT_IP>
       User <OpenWRT_Username>
       RemoteCommand /usr/bin/etherwake -b <MAC_ADDRESS>
       ExitOnForwardFailure yes
   

3. Usage:

   ssh wol-alias
   

Explanation:

• Host wol-alias: Create a custom alias (wol-alias) for the command.
• HostName: IP address of your OpenWRT device.
• User: Username to log in to OpenWRT.
• RemoteCommand: Executes the etherwake command when you SSH into wol-alias.
• ExitOnForwardFailure: Ensures the session exits after the command runs.

Note: Replace <OpenWRT_IP>, <OpenWRT_Username>, and <MAC_ADDRESS> with actual values.