It has become a standard that computer systems communicate with each other through IP (internet protocol). This guide discusses only the currently widespread used IPv4 (internet protocol version 4). IPv4 is facing a shortage of addresses so that your ISP would try various means and ways to save public IP addresses. There are various modes of IP networks. Among them are,
Since a LAN is private, you can assign any address you want as long as no two computers on a LAN have the same address. For a computer to operate on the public Internet, it must have a public IP address conforming to the world wide internet authority. Therefore, for a LAN computer to connect to the world wide internet, it needs to go through a router with NAT (network address translation). You need to remember to differentiate between two modes of IP addresses
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