What is SSH? How does Linux modify the SSH port number?

SSH connection can remotely manage devices such as Linux, the default LINUXSSH port is 22 port, How to modify the SSH default port, how to increase the SSH port? , let me show you a little bit

Tools/Materials

• Xshell Putty and other Remote Tools Linux systems

What is SSH?

1. 1

   SSH to Secure Shell

   Developed by the network Working Group of the IETF (Working Group);

   SSH is a security protocol based on the application layer and the transport layer.

   SSH transmission data is encrypted , can effectively prevent the transmission process is intercepted data security.

   SSH data is compressed , so it can speed up the transfer

   END

View SSH Services

1. 1

   First look at whether the current Linux installed SSH software package, using Rpm-qa|grep SSH

2. 2

   2. Verify that the SSH service is turned on, and the following is a sample of the CentOS system

3. 3

   3. Find the SSH service profile path is generally under/etc/ssh This directory sshd_config this file

   END

Edit Modify SSH port number

1. 1. Using the VI \vim Editor, open sshd_config This file, search to find the Port field. Such as

2. 2 position the cursor to port 22 this line YY then keyboard p copy a line, insert Insert edit 22 Port 2222

3. 3 after Setup, for example, Wq save to exit, indicating that a 2222 port number has been added.

4. 4. After setting up, of course, you need to restart the SSH service.

5. 5. If you have a firewall set up, modify the Add Firewall rule, or just close the firewall.

   END

Precautions

• SSH port default is 22, if you want to modify the direct edit 22 Port Note the previous "#" to remove, and then save the restart
• If you increase the port number, just follow the small way, add a port to

What is SSH? How does Linux modify the SSH port number?