In corporate environments, it is very common for servers to lack direct internet access. All network traffic must go through a proxy. If you try to pull a Docker image (docker pull) in this scenario without the correct settings, the command will fail or hang indefinitely. In this tutorial, you will learn how to configure
How to Configure Docker to Run Behind a Proxy Read More »
Practical guide to configuring NAT Overload and Port Forwarding in Cisco Packet Tracer. Connect your local network to the internet and allow external access to your internal web server with this complete lab.
Tutorial: Using Port Forwarding in Packet Tracer Read More »
Practical networking guide for beginners: simulate a web server and client in Packet Tracer. Set up crossover cables, IPs, connectivity, and test HTTP requests.
Tutorial: Web Server in Packet Tracer (Client-Server) Read More »
In this tutorial, you will learn how to set up a secure and functional email server on Ubuntu. From network preparation to installing Postfix (MTA), Dovecot (MDA), and the SnappyMail web client, without needing a database.
Email Server & Webmail Setup: Postfix, Dovecot, SnappyMail Read More »
Complete and practical guide on how to create a virtual machine and install Ubuntu 26 LTS Server on VirtualBox. Ideal for home labs, developers, and IT students.
Install Ubuntu Server 26 on VirtualBox (Step-by-Step) Read More »
Practical guide on how to configure NAT Overload (PAT) in Cisco Packet Tracer. See the network topology, essential router commands, and copy a complete script for your networking lab.
How to Configure NAT in Packet Tracer (Step-by-Step) Read More »
Protect your Linux servers against rootkits. Discover how to configure Zabbix to act as a File Integrity Monitor (FIM) and get real-time alerts if critical system files are unexpectedly altered.
Zabbix FIM: How to Setup File Integrity Monitoring Read More »
Learn step-by-step how to configure DHCP in Cisco Packet Tracer. See how to distribute IP addresses, masks, and gateways automatically using a dedicated server or a Cisco router.
Configure DHCP in Packet Tracer: Server & Router Guide Read More »
Discover why a cheap SSD can be a costly mistake. Learn the differences between SLC, MLC, TLC, and QLC cells, the risks of DRAM-less drives, and how to check your drive’s lifespan (TBW) before it fails.
Cheap SSDs: The Hidden Dangers of TLC, QLC & DRAM-less Read More »
If you manage a Zabbix environment, you’ve probably been there: a crowded “Problems” screen, where it’s hard to distinguish a critical production server from a forgotten test machine. In the past, we relied exclusively on Hostgroups to try to organize this mess. But in modern versions of Zabbix, there is a much more powerful and
Zabbix Tags Guide: Organizing and Filtering Monitoring Alerts Read More »
