{"id":2225,"date":"2023-01-18T21:44:05","date_gmt":"2023-01-18T21:44:05","guid":{"rendered":"https:\/\/tryrdp.com\/blog\/?p=2225"},"modified":"2026-05-24T06:27:07","modified_gmt":"2026-05-24T06:27:07","slug":"change-the-ssh-port-in-linux","status":"publish","type":"post","link":"https:\/\/tryrdp.com\/blog\/change-the-ssh-port-in-linux\/","title":{"rendered":"How to Change the SSH Port in Linux"},"content":{"rendered":"
\n
\"\"<\/figure>\n<\/div>\n\n\n

SSH (Secure Shell or Secure Socket Shell) is an open encrypted network protocol. It provides a safe way for users to access a computer to communicate and share data over an unsecured network. SSH uses a client-server model to provide encrypted data communications, strong password authentication, and public key authentication. <\/p>\n\n\n\n

Network administrators frequently use SSH to manage systems and applications. SSH also helps network administrators by allowing them to execute commands, move files, and log in to another computer over a network. It is mainly used to perform operations on a remote computer by login. <\/p>\n\n\n\n

SSH is utilized for port forwarding, tunneling, and the execution of Linux server commands. It is significant to set up SSH in Linux. Before changing the SSH port in Linux, it is essential to know the components of SSH command, various SSH commands, SSH command-line options, and SSH working. <\/p>\n\n\n\n

Components of SSH Command<\/strong><\/h2>\n\n\n
\n
\"Simplify<\/figure>\n<\/div>\n\n\n

SSH command has three components. They are the following.<\/p>\n\n\n\n

 \u2022 SSH command<\/code><\/pre>\n\n\n\n
 SSH command tells the machine to make an encrypted, safe connection to the host system.<\/p>\n\n\n\n
 \u2022 Username<\/code><\/pre>\n\n\n\n
 The name of a Linux user whose information is accessed by the host machine is the user name.<\/p>\n\n\n\n
 \u2022 Host<\/code><\/pre>\n\n\n\n
 IP address, domain name, and the user’s machine, such as a router or computer, are known as the host. <\/p>\n\n\n\n
SSH Commands<\/strong><\/h2>\n\n\n\n
An unsecured network-to-host encrypted connection is made possible by the ssh command. There are many SSH commands. They are the following.<\/p>\n\n\n\n
 \u2022 ssh-keygen<\/code><\/pre>\n\n\n\n
 ssh-keygen is used to create a key pair for public key authentication and connection establishment.<\/p>\n\n\n\n
 \u2022 ssh-add<\/code><\/pre>\n\n\n\n
 ssh-add is used to add a key to the agent.<\/p>\n\n\n\n
 \u2022 ssh-copy-id<\/code><\/pre>\n\n\n\n
On a server, ssh-copy-id is used to set a public key up as a legitimate user.<\/p>\n\n\n\n
 \u2022 ssh-agent<\/code><\/pre>\n\n\n\n
For single sign-on, ssh-agent is used to create an agent that holds the private key.<\/p>\n\n\n\n
 \u2022 sshd<\/code><\/pre>\n\n\n\n
 sshd is a Linux-based OpenSSH server.<\/p>\n\n\n\n
 \u2022 sftp<\/code><\/pre>\n\n\n\n
sfp is a file transfer client. This SSH command provides an FTP-like command-line interface.<\/p>\n\n\n\n
 \u2022 scp<\/code><\/pre>\n\n\n\n
Scp is a file transfer client. This SSH command provides an RCP-like command-line interface.<\/p>\n\n\n\n
SSH command-line options<\/strong><\/h2>\n\n\n\n
Port forwarding can be set up with the help of command-line options. There are several SSH command-line options. They are the following.<\/p>\n\n\n\n
 \u2022 -c<\/code><\/pre>\n\n\n\n
  For non-IN data, -c is used to specify the query class.<\/p>\n\n\n\n
\u2022 -A<\/code><\/pre>\n\n\n\n
-A is used to enable the authentication agent connection’s forwarding.<\/p>\n\n\n\n
\u2022 -a<\/code><\/pre>\n\n\n\n
-a is used to disable the authentication agent connection’s forwarding.<\/p>\n\n\n\n
 \u2022 -C<\/code><\/pre>\n\n\n\n
 On authoritative nameservers, -C is used to compare SOA records.<\/p>\n\n\n\n
\u2022 -l<\/code><\/pre>\n\n\n\n
 Using AXFR, -I is used to listing all domain hosts.<\/p>\n\n\n\n
 \u2022 -m<\/code><\/pre>\n\n\n\n
 The memory debugging flags, such as trace, usage, or record, is set by -m.<\/p>\n\n\n\n
 \u2022 -N<\/code><\/pre>\n\n\n\n
 -N is used to alter the permitted number of dots before root lookup.<\/p>\n\n\n\n
 \u2022 -v<\/code><\/pre>\n\n\n\n
 -v is utilized to print debugging messages for SSH connection. It is also used for the verbose result.<\/p>\n\n\n\n
 \u2022 -V<\/code><\/pre>\n\n\n\n
 -V displays the version number of the SSH tool<\/p>\n\n\n\n
 \u2022 -r<\/code><\/pre>\n\n\n\n
 Recursive processing is disabled by using -r.<\/p>\n\n\n\n
 \u2022 -R<\/code><\/pre>\n\n\n\n
 -R specifies the number of times UDP packets can be retried.<\/p>\n\n\n\n
 \u2022 -s<\/code><\/pre>\n\n\n\n
 -s is used to stop the query when a SERVFAIL response is received.<\/p>\n\n\n\n
 \u2022 -t<\/code><\/pre>\n\n\n\n
 The query type is specified with -t.<\/p>\n\n\n\n
 \u2022 -T<\/code><\/pre>\n\n\n\n
 The TCP\/IP model is enabled using -T.<\/p>\n\n\n\n
 \u2022 -w<\/code><\/pre>\n\n\n\n
 -w specifies the interminable response delay.<\/p>\n\n\n\n
 \u2022 -W<\/code><\/pre>\n\n\n\n
 -W indicates how long to hang tight for an answer.<\/p>\n\n\n\n
 \u2022 -6<\/code><\/pre>\n\n\n\n
 -6 is used for transporting IPv6 queries.<\/p>\n\n\n\n
 \u2022 -4<\/code><\/pre>\n\n\n\n
 -4 is used for transporting IPv4 queries.<\/p>\n\n\n\n
 \u2022 -d<\/code><\/pre>\n\n\n\n
  -d has the same use as -v.<\/p>\n\n\n\n
 \u2022 -i<\/code><\/pre>\n\n\n\n
 IP6.INT reverse lookups rely on -i.<\/p>\n\n\n\n
Working of SSH<\/strong><\/h2>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n
A host and client are needed to establish an SSH connection. The client and host can be a domain name, server, or IP address. The SSH client and SSH server should be connected to each other. The client establishes the connection by utilizing the host information. The SSH client and SSH server will be connected if the credential provided is verified.<\/p>\n\n\n\n
The following process is carried out while SSH working.<\/p>\n\n\n\n