The users which are want to set-up a LAN (Local Area Network) or WLAN (Wireless LAN) and connect all computers to the Internet without having to pay a full broadband subscription service to their ISP (Internet Service Provider) for each computer on the network. The router consists of one input port and three output ports for the purpose of packet enter at the source terminal and the packet is driven out at the destination terminal respectively. This type of packet travels through a router it is called as network router. In the network router specific packet contains 3 parts. Those are header part, data part and frame check sequence part.