Local Port Forwarding

ssh -L

Relay a port from a remote server to your local machine. (e.g. - access a remote database running on port xxxx, locally on port yyyy)

$ ssh -L 127.0.0.1:yyyy:localhost:xxxx username@remotehost.com
$ ssh -L 0.0.0.0:yyyy:localhost:xxxx username@remotehost.com
$ ssh -L [<LocalAddress>]:<LocalPort>:<RemoteHost>:<RemotePort> username@remotehost.com

Remote Port Forwarding

ssh -R

Make a local port available on a remote server. (e.g. - run a webserver locally on port xxxx, allow access to the webserver on a remote public server on port yyyy)

$ ssh -R 50.220.10.200:yyyy:localhost:xxxx username@remotehost.com
$ ssh -R [<RemoteAddress>]:<RemotePort>:<LocalHost>:<LocalPort> sshUser@remoteServer

# /etc/ssh/sshd_config
GatewayPorts yes

AutoSSH

# ~/.ssh/config
Host app-tunnel
    HostName remotehost.com
    User username
    Port 22
    IdentityFile ~/.ssh/id_rsa
    LocalForward yyyy localhost:xxxx
    ServerAliveInterval 30
    ServerAliveCountMax 3

$ autossh -M 0 -f -T -N app-tunnel

To make this persistent, create a service.

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