For that purpose, simply install Network Shutdown Tool on the computer, which you are going to manage the power state from.
It is best to use Network Shutdown Tool in a Windows domain. When running Network Shutdown Tool in a domain, you do not need to configure the remote computers additionally. Simply obtain the Windows domain administrator privileges. In the case with the peer-to-peer network, you would need to provide the administrator login and password for the remote computer in the application settings. Also make sure that the computer allows remote user logon with administrator privileges.
In your firewall application settings, add the exception for Network Shutdown Tool.
The application uses SMB protocol, MICROSOFT_DC port (tcp 445). For Wake-On-LAN it uses port 7 over UDP by default.
Make sure that the remote computer is turned on and is available over the net. Make sure that the firewall on the remote and local computer does not ban Network Shutdown Tool.
By default, the wake up packet uses the broadcast address 255.255.255.255. The majority of routers discard such packets. To override this situation, you would need to provide a broadcast address of the subnet with the remote computer. For example, for the subnet 192.168.1.0/24 (mask 255.255.255.0), the broadcast address is 192.168.1.255. You can take advantage of the ipcalc utility to calculate broadcast address for a subnet.
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