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Secure Shell or commonly referred to as SSH is an administration protocol that allows someone to access the server safely because SSH uses encryption. As the name implies "secure" which means safe and "shell" which is a computer program designed to be run by the Unix shell.

Then, what is SSH Port Forwarding? SSH Port Forwarding or SSH Tunneling is a technique or way to perform a tunneling protocol that allows data to be transferred from one network to another using SSH. Using an SSH connection will be more secure than accessing it directly. In short, SSH Port Forwarding can be used to access protocols that are less secure or vulnerable because they are not encrypted to be more secure (safe) using SSH because SSH uses encryption.

Forwards the connection from the user to the SSH server and then to the port of the destination host. Local Port Forwarding allows users to access a server that is protected by a firewall so that it cannot be accessed directly (to access the computer or PC used must be on the same private network).

Symmetric encryption is a form of encryption in which a secret key is used to both encrypt and decrypt messages by both the client and the host. Effectively, anyone with the key can decrypt the message being transferred.

The last stage before the user is granted access rights to the server is to authenticate his credentials. For this, most SSH users use passwords. The user will be asked to enter a username, then a password. Securely, these credentials are sent through a symmetric encryption tunnel so that no third party can steal them.

DNS server is a server that is used as a translator of IP addresses into host names to make it more efficient and easy to remember. Additionally, DNS is used to identify computers, services, and other resources that can be reached via the Internet or other Internet Protocol (IP) networks.