Intranet and Internet IP addresses

Internet and Intranet are two Internet access methods.

Intranet access mode: the IP address obtained by the computer accessing the Internet is the reserved IP address on inetnet. The reserved IP address can be in the following three forms:
10. x
172.16.x.x to 172.31.x.x
192.168.x.x
Computers on the intranet use the NAT (Network Address Translation) Protocol to access the Internet through a public gateway. Computers on the Intranet can send connection requests to other computers on the Internet, but other computers on the Internet cannot send connection requests to computers on the Intranet.
Internet Access Mode: the IP address obtained by the computer on the Internet is a non-reserved IP address on inetnet. Computers on the Internet and other computers on the Internet can access each other at will.
NAT (network address translator) is a network address translation that converts Intranet IP addresses and public IP addresses, and converts a large number of Intranet IP addresses into one or a small number of public IP addresses, reduce the usage of public IP addresses. The most typical application of NAT is: In a LAN, you only need a computer to connect to the Internet, you can use NAT to share the Internet connection, so that other computers in the LAN can also access the internet. Using the NAT protocol, computers in the LAN can access computers on the Internet, but computers on the Internet cannot access computers in the LAN.
In Windows, software such as Internet Connection Sharing, Sygate, WinRoute, and natd in Unix/Linux use the NAT protocol to share Internet connections.
Almost all Internet access methods provided by Internet service providers are based on the NAT protocol.