Remote port forwarding allows someone to ‘send’ a local port on their machine and essentially map it onto the SSH server. We’ll use an example to both illustrate the commands involved and highlight it’s use.
Alex is an someone who has a FTP server on his work computer that he wants to access from home. The company firewall however only allows port 80 outbound. Using Remote Port Forwarding he can ‘send’ his local port 21 to his computer at home.