By using SSH Tunneling, it allows us to forward a port from a remote server to a local or vice versa, it can also function as a proxy server. Easier to configure than a Virtual Private Network, which aims to secure private network communications over a public network.

This type forwards the requested port on the local to the remote server. For example, we want to access a web application that is on a remote server, but it is blocked by a firewall, so it cannot be accessed directly, only those on a private network can access it.

Dropbear is a software package written by Matt Johnston that provides a server and client compatible with Secure Shell. It is intended to replace the standard OpenSSH and is suitable for environments with low memory and processor resources, such as embedded systems. It is the core component of OpenWrt and other router distributions.

OpenSSH (also known as OpenBSD Secure Shell) is a set of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure channel through insecure networks in a client-server architecture. OpenSSH started as a branch of the free SSH program developed by Tatu Ylönen; The latest versions of SSH Ylönen are proprietary software offered by SSH Communications Security. OpenSSH was first released in 1999 and is currently being developed as part of the OpenBSD operating system. OpenSSH is not a single computer program, but a series of programs that serve as an alternative to unencrypted protocols such as Telnet and FTP. OpenSSH is built into various operating systems, namely Microsoft Windows, macOS, and most Linux operating systems, while the portable version is available as a package on other systems..