Reverse SSH into the Source ( 202.10.135.4) from the Destination(192.168.1.1) by executing the below SSH command in the destination host. We can use the Reverse SSH Tunnel Port Forwarding feature to access the web application running on any host present in the same local network as the Destination host. Res.writeHead(200, ).listen(3000) //the server object listens on port 3000 Let’s use the following simple nodejs web application for the demo. Let’s assume the web application listens on TCP port 3000. Let’s say you want to access a nodejs web application running in a server in the same local network as the Destination host behind a NAT router. To explain the concept of Reverse SSH Tunnel with Port Forwarding, let’s use a HTTP web server example. How to create a Reverse SSH tunnel with Port Forwarding ? If you capture the packets arriving at the Destination using an IP packet sniffing tool like Wireshark, you’ll find that the arriving packets have two SSH headers, unlike regular SSH connections that have only one SSH header. All data transmitted over the second SSH connection will actually be going via the first SSH connection. The second SSH connection is created from the Source to the Destination through the first SSH connection. The first SSH connection is created from the Destination to the Source. We call this SSH Reverse Proxy tunneling. In this scenario, there are two SSH connections established between the Source and the Destination, one within the other. Now, using an SSH client, you can SSH login into the Destination host behind NAT through the public SSH server(Source) and the reverse SSH tunnel created in step #1. The above command basically instructs the SSH server to listen for any connection on TCP port 20022 and blindly forward it to the destination host’s TCP port 22 (SSH server port). This will create a Reverse SSH Tunnel from the destination to the source. Using an SSH client, create a reverse SSH tunnel to the Source ( 202.10.135.4) from the Destination (192.168.1.1) using the following command: $ ssh -fNT -R 20022:localhost:22 You want to access a service (SSH server or HTTP web server) running in the destination host via the Souce SSH Server. You have an SSH Server (with Public IP: 202.10.135.4) and you want to access a destination host (with local IP 192.168.1.1) behind a NAT router or firewall. However, the solution has some real security challenges when it comes to business use cases, which we’ll discuss in the end. This solution is great for hobbyists, hackers, and professionals tinkering with Raspberry Pi. SSH reverse proxy tunneling is a secure method to set up remote access to your Raspberry Pi or any machine(server, laptop, PC) behind a NAT router or firewall. This is called SSH reverse proxy tunneling. Note the direction of this second SSH connection: it starts from the public SSH server in the internet and ends at the SSH client behind NAT and firewall. You access the client machine and its private network through this SSH tunnel (larger tube). Next, from the public SSH server, you can establish a second SSH connection to the SSH client through the SSH tunnel created in the previous step (imagine a smaller tube within the larger tube). Note the direction of this first SSH connection: it starts from the SSH client behind NAT and ends at the SSH server in the public internet. Let’s say you want to access an SSH client behind a NAT router or firewall from a public SSH server.įor this, you first need to create an SSH connection, also known as an SSH tunnel, from the SSH client to the SSH server (imagine a large tube connecting two endpoints).
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