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I didn't just want to understand how firewalls work in theory – I wanted to configure one myself. So I installed OPNsense on my Raspberry Pi and set it up as my own firewall solution. At first it was unfamiliar. Assigning interfaces. Configuring WAN and LAN correctly. Defining rules – and suddenly nothing works anymore because a rule is set incorrectly. Working with firewall rules in particular has shown me how sensitive networks are. One wrong rule – and all traffic is bloc

Sometimes it's not the complex problems that hold you back. Sometimes it's a small, inconspicuous mistake – that occupies you for two weeks. This project actually started with great motivation: I wanted to delve deeper into virtualization and build my own learning environment for my apprenticeship final exam. The idea was clear: A dedicated server. Own VMs. Own test environment. And all of this with Pimox – basically like Proxmox and the same system, but designed for the

Published: May 8, 2025 As an apprentice in the field of IT / systems engineering, I learn daily how servers, networks and user management systems work. At school, we prepare for exams – Active Directory, network technology, server services, rights management. And almost everything runs through graphical user interfaces. Windows Server with GUI. Management consoles. Event viewer. Active Directory with one click. But at some point I asked myself a simple question: Do I truly un