How to Forward Internal Ethernet IP:Port to Localhost:Port on Ubuntu

Описание: Learn how to efficiently forward an internal Ethernet IP:Port to localhost:Port on Ubuntu, enabling easy access to devices on your local network.
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This video is based on the question https://stackoverflow.com/q/73081422/ asked by the user 'RedstoneHair' ( https://stackoverflow.com/u/12017995/ ) and on the answer https://stackoverflow.com/a/73097766/ provided by the user 'RedstoneHair' ( https://stackoverflow.com/u/12017995/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Forward Internal Ethernet IP:Port to Localhost:Port on Ubuntu

If you're using a Linux machine, particularly Ubuntu, you might encounter scenarios where you need to access a device on your local network, such as a Raspberry Pi (RPI). Such cases can arise when specific functionalities, like Wi-Fi, are not operational, forcing you to rely on other means of connectivity.

In this guide, we’ll explore how to forward an internal Ethernet IP:Port to a localhost:Port, ensuring that you can easily access your RPI or any other device across your network.

Understanding the Problem

Imagine you've set up your Raspberry Pi with an internal IP address (in this case, 10.42.0.206) but want to access it from another device on your network using a different IP and port combination (e.g., 192.168.1.13:5022). You might be wondering how to forward connections from your Ubuntu machine to that specific internal IP:Port.

The solution involves creating a proxy that will handle this forwarding, allowing seamless communication between devices on your local network. Let's break down the solution into manageable steps.

Step-by-Step Solution

Step 1: Install SimpleProxy

The first step in setting up port forwarding is to install a lightweight proxy tool. We'll use simpleproxy for this task. Open your terminal and run the following command:

[[See Video to Reveal this Text or Code Snippet]]

What this does: This command installs the simpleproxy package, which allows you to easily set up proxy forwarding between internal and external ports.

Step 2: Run SimpleProxy

Once you have installed simpleproxy, you can run it to create the actual forwarding bridge you need. The command to start simpleproxy looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the command:

-L 5022: This specifies the local port on your Ubuntu machine that you want to use to access the device (you can change 5022 to any other available port if required).

-R 10.42.0.206:22: This indicates the internal IP address and port of your Raspberry Pi that you want to forward to.

Customizing Your Command

Feel free to replace the ports in the commands to suit your specific needs:

If you want to use a different local port, simply change 5022 to the desired port number.

If your internal device’s IP and port differ from 10.42.0.206:22, replace it with the correct ip:port.

Conclusion

Setting up internal Ethernet IP forwarding on Ubuntu is quite straightforward with the simpleproxy tool. By following the steps outlined in this post, you can gain easy access to your Raspberry Pi or any other device within your local network seamlessly.

Remember: Properly managing network connections can enhance your productivity and simplify the tasks you aim to accomplish with your devices.

If you have any further questions regarding this process or run into issues while setting it up, feel free to ask! Happy networking!