Telnet Remote Login Protocol

What is Telnet?
For the understanding of Telnet, different people hold different views, can be used as a communication protocol telnet, but for intruders, Telnet is only a remote login tool. Once the intruder establishes a Telnet connection with the remote host, the intruder can use the hardware and software resources on the target host, and the intruder's local machine is only the equivalent of a keyboard and display terminal.

Why do I need Telnet?
Telnet is to see if a port is accessible. When we are doing development, the port we often use is 8080. Then you can start the server and use Telnet to see if the port is available.

Telnet usage test port number: https://jingyan.baidu.com/article/a3aad71aa9e6efb1fb009694.html
The Telnet protocol is a member of the TCP/IP protocol family and is the standard protocol and primary way for Internet remote Login services. It provides users with the ability to perform remote host work on the local computer. Use the Telnet program on the end user's computer to connect to the server. End users can enter commands in the Telnet program that run on the server as if they were entered directly on the server's console. The server can be controlled locally. To start a Telnet session, you must enter a user name and password to log on to the server. Telnet is a common way to remotely control a Web server.

How does Windows xp perform the telnet command?

1, click start → run → input cmd, enter.
2. In the DOS interface, enter the Telnet test port command: telnet IP port or Telnet domain port, enter.
If the port is closed or unable to connect, display a link that cannot be opened to the host, the link fails, and if the port is open, the link succeeds, then goes to the Telnet page (All Black) and proves that the port is available.

"CTRL +]" Combo key fallback to telnet command input interface

　

Press ENTER again to enter the remote interface

The Telnet client commands a common command:

Open: Use Openhostname to establish a Telnet connection to the host.

Close: Use the command Close command to close an existing Telnet connection.

Display: Use the display command to view the current settings of the Telnet client.

Send: Use the Send command to send commands to the Telnet server. The following commands are supported:

AO: Discards the output command.

Ayt: "Is You There" command.

ESC: Sends the current escape character.

IP: Interrupt process command.

Synch: Performs a Telnet synchronization operation.

BRK: Sends a signal.

Commands other than those listed in the previous table are sent as strings to the Telnet server. For example, SENDABCD will send the string ABCD to the Telnet server, so that the string will appear in the Telnet session window.

Quit: Use the QUIT command to exit the Telnet client.

Telnet Remote Login Protocol