System & Network Admin

Learn about iptables firewall, Chains, Policies, Adding, Deleting, Replacing, Saving and Listing Rules, Block ICMP Packets, Blocking Bad Flags, SYN Flooding

How to move away from RSA for SSH keys - Xe's Blog

Processor affinity is the process of allocating CPU cores to specific apps. We show you how to assign a specific CPU core to a Windows app.

Automatically-provisioned TLS certificates for Node.js servers using Let’s Encrypt.

To make it quick, I wish I had known about port forwarding and tunneling earlier. With this blog post, I try to understand it better myself and share some experiences and tips with you. Topics: use ca

It’s simple! Just create a key and start encrypting your files securely

This guide highlights the usage of useful Git commands for handling distributed version control on Git-repository management systems like GitHub and GitLab.

In this article, we will show you a simple trick to help you run a cron job every 10, 20, and 30 seconds or x seconds in Linux.

The comments section on the blog will be closed starting December 21 as the website receives an overhaul. In the meanwhile, there is a dedicated thread on the PINE64 Forum to discuss this month'

File structure

Share secrets with public cryptography Software Development, API development, Indutrial IOT

Disclaimer: There are more meaningful, and more advanced solutions to test your security solutions, but for a quick, simple, and riskless test, the upcoming test files are more than enough. EICAR test

It can frustrate to work on complex commands in the terminal. I'll present you some tips on how to manage them. If you have another tip, I'd appreciate a quick message. Use backslash\ to add a line b

Important disclaimer: This solution is not secure! - It is fine for a quick and temporary solution for your local network, but it is not a secure solution for important ressources that are available o

Disclaimer: Read the whole post before you start. This will help you avoid a lock-out Generating a secure key pair SSH keys use asymmetric cryptographic algorithms that generate a pair of separate

We all know that it is important to secure your machines. I am going to show you some ways to do so. Some are trivial and should be set immediately, and some require some more work. Part 2 will follow

Building Go programs with Nix Flakes - Xe's Blog

Yes, I am needing to know what the total number possible IPs in the public IPv4 space. I'm not sure where to even get a neat list of all the IP address ranges, so could someone point me to a reso...

In this article you will learn a combination of common scenarios with iptables, one of the most popular tools for configuring the Linux kernel firewall.

Software-based WebAuthN/2FA

The initial startup firmware is a crucial part of your computer's booting process. Learn about UEFI and how it stacks up vs. the older BIOS.

In this article, we will explain how to find out the Linux distribution name, kernel version, release version, hardware name, and other Linux system information

Both apt remove and apt purge commands are useful in uninstalling a package, but the apt purge removes any configuration files associated with the package.

A free and open-source app for two-factor authentication codes on the Linux desktops.