Now if sshd is set to use GatewayPorts you should be able to connect with this: This connection must remain on the entire time to ensure that you can access your destination computer whenever you want. Ssh -R 10002:localhost:22 will open port 10002 for listening and forward all future connections to port 22 at destination. Replaceing middleuser with your name and replacing middle with the domain of the middle computer. On the destination computer type the following command. In order for you to create a reverse tunnel you must have SSH access to a middle computer that you can connect to from origin computer. I don’t believe gotomypc works for Linux however. So how about gotomypc? Well if you don’t have a computer in the middle to connect to and are willing to pay $19.95 a month, its not a bad service. To establish a reverse tunnel in Linux you type in only one simple command. But if you are dealing with a Linux machine there is a much easier way, provided that you ssh access to a computer in the middle. If you are trying to connect to a Windows machine by all means it is probably easier to just install Hamachi. That makes the Linux version of Hamachi useless. After searching I found that Hamachi does not support low-speed relay (reverse tunnel) with their linux version of the program. After trying to connect with my windows machine outside the NAT I found that it couldn’t create a connetion. Well I actually forgot about reverse tunnels the other day and installed hamachi on my linux server. Can’t I just use Hamachi gotomypc or some other software? We are going to have to find our middle man on our own.

If you are familiar with Hamachi or gotoypc type software this is the exact same thing they do to connect to computers behind NAT/Firewalls, only they use their severs as the middle man. For this reason we need to create a reverse SSH tunnel to establish a connection. Computers behind a NAT can only recieve packets that they request. The problem with NAT is, that you can’t directly connect to the computers that are outside the NAT.

Almost all large networks (corporate and universities) including home routers are now using some sort of NAT (Network Address Translation). Problem was that the destination computer was behind a NAT and a firewall.

Recently I wanted to control my computer from a remote location. Bypass Firewall and NAT with Reverse SSH Tunnel Written by Mark Sanborn: Feb 27, 2008

How to change nat type to open hamachi