Keep persistent SSH session using autossh and cron

Background Knowledge

SSH Tunneling

• Local Port Forwarding: used to forward a port from the client machine to the server machine.
• Remote Port Forwarding:

Local Port Forwarding

ssh -L [bind_addr:]port:target_addr:target_port user@server

• bind_addr
• port
• target_addr
• target_port
• user
• server

Remote Port Forwarding

ssh -R [bind_addr:]port:target_addr:target_port user@server

• bind_addr
• port
• target_addr
• target_port
• user
• server