About the translation between private and common addresses in the network

There seem to be two ways.

Category B: Category C:

Private addresses can be repeated, public addresses are unique in the world, private addresses can only appear in the local area network, and cannot appear on the Internet.

NAT address translation in the router usually has three conversion forms: 1, static conversion, 1-to-1, a private network address corresponds to an external network address, and the route receives a request for this external network address directly to the corresponding private network address.

2. The conversion in turn is generally many-to-many, for example, there are 3 intranet addresses and 2 public addresses.

And, routing the received request, transfer, received request transfer, and received request transfer, so that the turn 3, single IP multi-port, many-to-1, a bunch of intranet addresses correspond to a public network address, the public network address with the same IP different ports correspond to different IPs in the intranet, such as public network: 1 corresponds, : 2 corresponds, etc., generally Internet cafes use this

in RFC1918

decided in . A private address cannot traverse a router, where the private address is.

These three categories. The status is a private IP address.

At the same time, RFC was also released.

NAT Address Translation As.

The private address is a solution for public network access.

These CIDR blocks will not be published on the Internet.

In principle, other addresses other than these addresses can be used as public IP addresses.

However, if these so-called public addresses are used on the intranet of the organization, they are actually private network addresses, because they are not published on the public network.

For example, the network addresses used in the company are all intranet addresses, and in addition to these intranet addresses, other addresses outside the network are extranet addresses, so to sum up:

In addition to the absolute number of private address segments, the address published to the public network is the public address, and the private address that is configured in the private network is used by yourself.

And the intranet address and extranet address are mentioned above.

A private IP is an IP address on a local LAN, which corresponds to a public IP (IP on the Internet).

With the development of private IP networks, in order to save the registered IP addresses that can be assigned, there is a set of IP addresses that are taken out specifically for private IP networks, called private IP addresses.

A: That is, that is.

These addresses are not assigned by the Internet, they are not routed on the Internet, and although they cannot be directly connected to the Internet, they can still communicate with the Internet through technical means (NAT technology). We can choose the appropriate address classes according to our needs and use these addresses as if they were public IP addresses in the internal LAN. On the Internet, some devices that do not need to communicate with the Internet, such as printers, manageable hubs, etc., can also use these addresses to save IP address resources.

I guess it's internal.