What is Wake on LAN?

--> Wake on Lan is a method of turning on a group of computers or one computer by sending a special packet.

--> Wake on LAN server is responsible for generating a special packet using an application installed on the server.

--> The computer which is connected on LAN can be turned on from sleeping or liberate or shut down until the power cable is connected to the computer.

--> The computer's motherboard needs to support wake on Lan in order to work.

--> No configurations are required if LAN computer's and the server is on the same network as it uses the broadcast frame to turn on the computer.

    Router (config)# interface vlan 20

    Router (config)# ip helper-address 192.168.10.50

    Router (config)#ip forward-protocol udp 7

(or)

    Router (config)#access-list 10 permit 192.168.10.50

    Router (config)#int vlan 20

    Router (config)#ip directed-broadcast 10
--> The Broadcast Packet uses UDP to communicate with WOL server to WOL enabled PC.

--> IP helper address or IP directed broadcast command is required on the router or layer3 switch if server and PC are on the different subnet.

--> No configurations are required on the switches.