A port-knock server that listens to all traffic on a given network interface (only Ethernet and PPP are currently supported), looking for a special “knock” sequences of port-hits. A remote system makes these port-hits by sending a TCP (or UDP) packet to a port on the server. When the server detects a specific sequence of port-hits, it runs a command defined in its configuration file. This can be used to open up holes in a firewall for quick access. I will show you how to install knockd on Ubuntu 22.04 in this tutorial.
- OS: Ubuntu 22.04 or older Ubuntu versions
- Privileges: Ascertain that you are able to execute sudo commands.
Install knockd Ubuntu 22.04
knockd is one of the popular ways on Ubuntu now so that this tutorial will show you some ways to install it. Choose the one that you think is easy and you can follow.
Install knockd using APT
This is a popular method for installing Ubuntu packages since it’s simple to understand, even if you’re new to Linux. Following these steps to install knockd on your Ubuntu.
Step 1: The APT package repository cache needs to be updated before you try to install, update, or remove any packages. Update the APT database to fetch new packages from Ubuntu. Opening the terminal and executing the following Linux command:
Step 2: Install the package on Ubuntu 22.04. After updating the system, you can install knockd Ubuntu by executing this command in the terminal.
Install knockd using Aptitude
If you haven’t already installed Aptitude on Ubuntu, run this command to do so.
Then, you can now install knockd by following these steps:
Step 1: Update the APT database to download new packages from Ubuntu. Launching the terminal and entering the following Linux command:
Step 2: Start the package installation on Ubuntu 22.04. You can now install knockd Ubuntu by executing this command in the terminal.
Uninstall knockd on Ubuntu 22.04
Have you ever considered how difficult it is to uninstall an application from Ubuntu? You are mistaken; anyone, not just package administrators, can easily uninstall any program.
If you installed knockd using APT or Aptitude, you could uninstall knockd on Ubuntu by running this command
To uninstall knockd and remove its data and dependencies, you can also use the following command:
In this guide, I showed you ways to install knockd on Ubuntu 22.04 and ways to uninstall knockd too. Please contact me if you require any assistance. I’d be delighted to respond.