How do Wake-On-LAN works
4 days ago
- #Wake-on-LAN
- #Remote Wake-up
- #Network Protocol
- Wake-on-LAN (WoL) is a network protocol that wakes a computer from a low-power state via a Magic Packet, sent to the network interface.
- Magic Packets consist of 6 synchronization bytes (FF FF FF FF FF FF) followed by the target's MAC address repeated 16 times without separators, optionally with a password field.
- WoL requires the target computer to be on the same network or VLAN, connected via Ethernet, and its MAC address must be known; it does not work over Wi-Fi or guarantee wake-up.
- Magic Packets are typically sent as UDP datagrams to broadcast addresses (e.g., 255.255.255.255 for IPv4, port 9) since the Ethernet interface scans for them directly.
- Implementing WoL in Golang involves creating a function to validate the MAC address, construct the Magic Packet, and another to send it via UDP using the net library.