53 

    54 * Reverse SSH Tunneling

    55 

    56 Have you ever wanted to ssh to your Linux box that sits behind NAT? Now you can with

    57 reverse SSH tunneling. This document will show you step by step how to set up reverse SSH

    58 tunneling. The reverse SSH tunneling should work fine with Unix like systems.

    59 

    60 Let's assume that Destination's IP is 192.168.20.55 (Linux box that you want to access).

    61 

    62 You want to access from Linux client with IP 138.47.99.99.

    63 Destination (192.168.20.55) <- |NAT| <- Source (138.47.99.99)

    64 

    65 SH from the destination to the source (with public ip) using command below:

    66 

    67   $ ssh -R 19999:localhost:22 sourceuser@138.47.99.99

    68 

    69 port 19999 can be any unused port.

    70 Now you can SSH from source to destination through SSH tuneling:

    71 

    72   $ ssh localhost -p 19999

    73 

    74 3rd party servers can also access 192.168.20.55 through Destination (138.47.99.99).

    75 Destination (192.168.20.55) <- |NAT| <- Source (138.47.99.99) <- Bob's server

    76 

    77 From Bob's server:

    78 

    79   $ ssh sourceuser@138.47.99.99

    80 

    81 After the sucessful login to Source:

    82 

    83   $ ssh localhost -p 19999

    84 

    85 The connection between destination and source must be alive at all time. Tip: you may run

    86 a command (e.g. watch, top) on Destination to keep the connection active.