ssh tunnel

Create a tunnel to a remote host via a gateway

    ssh -L <local-port-to-listen>:<destination-host>:<destination-port> <gateway_user>@<gateway>

This opens a local port listening for traffic on <local-port-to-listen> and forwards that traffic via the gateway (user@gateway) to the remote destination <destination-host>:<destination-port>

-f executes ssh in the background
-N means no remote command (ie: just create a tunnel)

    ssh -N -f -L 8080:destination:8080 user@gateway

Pointing your browser to localhost:8080 will connect to the ssh tunnel which forwards the data to destination:8080, going via the gateway