A static NAT
Inside local address is converted into one inside global address, rather inside the local every PC bundled with a global address, even if the address is not used, the other computers can not be used to convert use, so easily lead to IP addresses waste of resources, general services for the network, including external service provider is
Second, dynamic NAT
As the name suggests, is the dynamic address translation, when the inside local address translation to select a free address pool, the address is not being used, the conversion is performed, in general the selected address in the address pool top surface definition, when the data transfer is completed or access will be returned to the address pool for use by other hosts inside the local use, however, if this address when being used, it can not be used to host another address conversion
Third, the port multiplexing NAPT
Converted by the router address, port number, is converted into a plurality of internal local internal global, different identification by host IP address, a port number, a port number of IP addresses available is 4,000
The advantages and disadvantages of NAT
