Mr.TechSparrow

Whether you are a student experimenting on a personal laptop or a systems engineer managing bare-metal servers in a remote data center, mastering network configuration and troubleshooting is a non-negotiable skill. When a server drops off the network—and eventually, one always does—you need to know exactly which commands to run to prove where the fault lies. In this guide, we will walk through the essential network configuration and troubleshooting workflows specifically tailored for Ubuntu 24.04 LTS (Noble Numbat). 01. Interface IP Configuration To function within a local network, a device needs an IP address. If it needs to access the internet or communicate with devices on different subnets, it also requires a default gateway. When configuring these IP settings, don't be surprised if your configurations suddenly disappear after a system reboot! This happens because Ubuntu utilizes two distinct types of network configuration: Live (Temporary) and Persistent . 01.1. Live (Tempora...

As a business evolves from a small local operation into a large enterprise, its technological and security requirements scale rapidly. Opening international branch offices and establishing third-party vendor partnerships mean that users across the globe suddenly need constant, reliable access to centralized servers in the corporate HQ, private data centers, or cloud environments.  Historically, companies relied on dedicated leased lines (like MPLS) to achieve this. However, leased lines are notoriously expensive, slow to provision, and lock businesses into rigid carrier contracts. This is where Site-to-Site VPNs come into play. By leveraging standard, cost-effective internet connections, a Site-to-Site VPN creates a secure, encrypted tunnel over the public internet, allowing remote locations to access corporate resources as if they were physically present on the local network. In this guide we will look into how to setup a Route-Based VPN which is easier to configure and manage tha...

GNS3 is an industry-standard tool used by students and network professionals alike for emulating complex network environments. While it runs natively on Linux distributions with virtually no issues, Windows users often face frustrating limitations when trying to emulate modern appliances from various vendors. To run heavy network emulations on Windows, the official recommendation is to use the GNS3 VM running inside VMware Workstation. However, this creates a massive headache for modern Windows users. If you are running Docker, WSL2 (Windows Subsystem for Linux), or Hyper-V, Windows requires the "Virtual Machine Platform" feature to be enabled. Historically, this feature violently clashes with VMware, preventing the GNS3 VM from booting or causing massive performance drops. The ultimate workaround? Stop fighting Windows. In this guide, we will learn how to bypass these nested virtualization issues entirely by building your own dedicated GNS3 Server on a native Linux backend....