Vronat NAT network address type conversion

Vronat NAT network address type translation (NAT) is also called network address type conversion. There are three main types: static NAT, dynamic NAT, and port address ing. Note that there is a big difference between the three types. When using this technology, the network administrator must understand the differences between them, and then select appropriate implementation methods based on the actual situation of the enterprise. The first type is static network address translation. Its main feature is one-to-one. That is to say, this type of network address translation is designed for one-to-one ing between local and global addresses. This requires that each host in the network use a real and valid IP address. In combination with the above case, if all three internal servers of the enterprise need to be accessed by external users, at least three IP addresses are required. Obviously, this method cannot save IP addresses. Generally, static NAT aims to hide the IP address of an enterprise's internal server to protect the server. The second type is dynamic NAT. This type of network address translation maps an enterprise's internal IP address to a valid IP address. Although this is also a one-to-one relationship, it is very different from static NAT. The former requires that the enterprise internal server must also have a public IP address. Dynamic NAT does not have this requirement, that is, internal addresses can be used for internal servers in the enterprise. However, a public IP Address can only solve the access problem of an internal server. This is still different from the requirements mentioned above. The third type is port address ing. The port address is mapped to dynamic NAT. To put it simply, the working mode is usually one-to-one. Multiple internal IP addresses (intranet addresses) can be mapped to one public IP address. Specifically, the Intranet address + port number correspond to the Internet address. With this port address ing, enterprise network administrators can place internal application servers (even if they do not have valid public addresses) on the Internet for access by Internet users. It can be seen that in the process of implementing NAT Network Address Translation, you can understand the three different working modes and then select an appropriate implementation method based on the actual situation of the enterprise. This is the most critical content. Generally, if an enterprise has enough public IP addresses, but only needs to hide internal services for security reasons, it is better to use static NAT. On the contrary, if an enterprise has multiple servers, but the valid IP address is not enough. In this case, you need to use port address ing to map multiple internal IP addresses through the port to the public IP address.