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 »
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 »
Let’s talk about one of the most primitive and, at the same time, most robust routing techniques: Flooding. Imagine you need to spread urgent gossip. You don’t choose a specific person; you shout to everyone nearby, and those people shout to the next ones, and so on. That is Flooding. 1. How does it work
Flooding Routing Algorithm: How It Works & Use Cases Read More »
If you have ever used a GPS to avoid traffic, you already intuitively understand the fundamental problem of computer networks. When you send a message, it needs to traverse a “web” of routers to reach its destination. But how do these devices decide where to go? Do they choose the path with the fewest cables?
Routing & Dijkstra’s Algorithm: Finding the Internet’s Shortest Path Read More »
Keeping a server secure is an ongoing task, and one of the biggest threats is malicious software that hides in the system to grant an attacker persistent access. The most dangerous among them are rootkits. In this tutorial, we will introduce an essential, top-tier tool for any system administrator: the chkrootkit. It is a lightweight
How to Scan for Rootkits and Malware on Linux Servers with chkrootkit Read More »
If you have ever worked with networks in Linux environments, you certainly know and love netcat (or nc), the famous “Swiss Army knife” for network diagnostics. But when migrating to Windows, many system administrators and security analysts wonder: is there a native and equally powerful equivalent? The answer is a big yes! In modern Windows,
Netcat for Windows: The Ultimate Guide to Test-NetConnection in PowerShell Read More »
