The system administrator can redirect ports, and the common technique is to redirect one port to another address. For example, the default HTTP port is 80, and many people can redirect to another port, such as 8888.

Redirection is implemented to hide the identified default ports and reduce the damage rate. In this way, if someone wants to attack a recognized default port, they must scan the port first. Most port redirection is similar to the original port, for example, most HTTP ports are changed from 80: 8 1, 88,8000,8080,8888.

Similarly, the port of POP was originally in 1 10, and it is often redirected to 1 100. There are also many cases where statistically significant numbers are selected, such as 1234, 23456, 34567, etc.

Extended data:

Commonly used ports The port numbers of these ports range from 0 to 1023, which are closely bound to some specific services. Usually, the communication of these ports clearly indicates the protocol of a service, and such ports cannot be redefined. For example, port 80 is actually always used for HTTP communication, while port 23 is dedicated to Telnet service.

These ports are usually not used by hackers such as Trojans. In order to let people know more about these common ports, the services corresponding to these ports will be listed in detail later in this chapter.

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