NAT is the abbreviation of network address translation, with the use of network addresses translation technology, the "illegal Internet IP address" Inside LAN can be transformed into "legitimate Internet IP Address" through NAT, and realize legal access to the outside network such as Internet. The essence of NAT can be understood in this way, is a proxy proxy at the bottom of the packet, and it no longer acts as an agent for every Internet application protocol, such as Http,ftp,telnet, which acts as a proxy for each TCP/IP packet.
Using address translation technology, NAT checks and translates every IP packet address issued by an internal client, and sends the request-side IP address data in the packet to the Internet as a legitimate Internet external IP address. Nat then reorganizes the destination IP address in the packet based on the request-side records and converts it to the IP address of the LAN client and sends it to the client.
Windows & Windows 98se/me ICS (Internet Connection Share), which is also a set of NAT-type shared Internet software that can be added after you install the above version of Windows This component realizes sharing the Internet, but the function is relatively simple, the management control ability is few, with ADSL coordination problem more.
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