What is the Linux system connection port command?

The Linux system connection port commands are: 1. Telnet, a remote login protocol, can be connected to a specific port of the remote host through the Telnet client. The command example is "telnet "; 2. Netcat is a network tool that can create various connections in the network. The command example is "nc ".

Operating system for this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, to connect to a specific port on a remote host, you can use the Telnet or Netcat command. Both commands are tools for network connections and communications.

1. Telnet:

Telnet is a remote login protocol that can connect to a specific port of a remote host through a Telnet client. You can use the telnet command to establish a TCP connection to a remote host. The following is an example of the command to connect to a port using Telnet:

telnet <远程主机地址> <端口号>

For example, to connect to the SSH port of the remote host 192.168.0.100 (default is 22):

 telnet 192.168.0.100 22

If the connection is successful, you will see to information and welcome messages related to the port.

2. Netcat:

Netcat is a network tool, also known as the "swiss army knife", which can create various connections in the network. You can use the nc (netcat) command to connect to a specified port on a remote host. The following is an example of the command to connect to a port using Netcat:

 nc <远程主机地址> <端口号>

For example, to connect to the web server port of the remote host 192.168.0.100 (default is 80):

  nc 192.168.0.100 80

If the connection is successful, you will Can communicate with the target port.

Please note that using these commands requires ensuring that the corresponding service on the remote host is running and listening to the specified port. If the port is not open or the related service is not started, the connection attempt may fail.

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