NAT technology
Communication between the computer communications is just a way of people, everyone has their own unique phone number. Each computer also has a unique IP address, there are a number of IP addresses it? IP address consists of 32-bit binary data, a total of 32 power 4,294,967,296 2 is however not enough. When an organization's internal computer communication only if, in order to save IP, take nat technology.
There are three types of IP addresses on behalf of a private network.
10.255.255.255 10.0.0.0
172.16.0.0. 172.31.255.255
192.168.0.0 192.168.255.255
routers in the private network connected to the Internet to install the software nat. nat software will have a form for recording which corresponds to which public IP network dedicated IP, port and will be a conversion, for example, turned out to be 21 port, now converted into a number after a 2256 port, why? Assuming that all data packets to a private network are passed through a fixed port, it will clog is not it?
Note that the topic involved nat entitled to ask is converted or before conversion? Herein refers to the source address is the source address in the packet data transmission in a network, instead of the source address.