SSH/SFTP Reverse Proxy

I have two machines accessible on the Internet with no NAT involved. Both machines run an SSH service.

I want to connect via SSH/SFTP to Server A on Port 2000 and this connection should be routed to Server B Port 22 (behavior like a HTTP reverse proxy but using SSH/SFTP instead of HTTP)

Answer

You can use ssh port forward for archive this

ssh -L localportinmypc:hostname_of_the_behind_the_firewall:remoteport hostname_of_my_firewall

Now after this:

sftp -o Port=localportinmyp localhost or ssh -p localportinmyp