Category: Networking Fundamentals
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What Is Anycast? How One IP Address Can Live Around the World
One IP address, many service locations. Discover how anycast routes your packets to one of them—and why the nearest server is not always the closest on a map.
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Optical Circuit Switches: The Tiny Mirrors Rewiring Data Centers
Tiny mirrors can change which fiber ports are connected, making parts of a data-center network physically reconfigurable. Explore optical circuit switches, real deployments, and the difference between signal latency and circuit setup time.
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DNS Changed, but Your Website Still Opens the Old Server?
A DNS change can send some visitors to the new server while others still reach the old one. Learn how to compare authoritative and cached answers, interpret TTLs, and check IPv6 and application caches.
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Fast Internet, High Ping? How to Test and Fix Bufferbloat
A fast connection can still lag when a backup or download fills its queues. Learn how to compare idle and loaded latency, interpret a bufferbloat test, and tune Smart Queue Management.
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VPN Connected but Some Websites Won’t Load? Check MTU and MSS
A VPN can be connected while larger packets fail to cross its tunnel. Learn how to test path MTU, separate size errors from timeouts, and decide whether tunnel MTU or TCP MSS needs attention.
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Port Forwarding Not Working? Check CGNAT and Double NAT
Port forwarding not working? Check your local service, WAN IP, CGNAT, double NAT, and firewall with a practical example and PowerShell tests.
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Why Layering Is Not Just Abstraction: Real Problems Solved by the Internet Protocol Stack
In this article, we go beyond definitions and diagrams. We explore why layering exists, what concrete problems it solves, and what breaks when layering principles are ignored. Understanding this is essential for anyone who wants to truly understand how computer networks work — not just how they are drawn.
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Mastering Internet Routing with BIRD: A Step-by-Step Guide to Building Your Own Routing System
Want to learn how to master routing in modern networks? Our comprehensive guide to BIRD, the Bird Internet Routing Daemon, walks you through everything from installation to real-world deployment of BGP and OSPF configurations. Get step-by-step instructions, troubleshooting tips, and practical use cases that will help you build your own routing system.
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Gel-Filled Ethernet Cables: The Hidden Armor Protecting Your Outdoor Network
We’ll unravel the mystery of gel-filled Ethernet cables, from their structure to their superior resilience, and help you understand why they might be the best investment you can make for a reliable outdoor network.
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Zigbee: The Unsung Hero of Smart Devices
This article will delve into the nuts and bolts of the Zigbee protocol, decoding its magic and how it powers the hidden conversations of our smart homes. From its architecture to its real-world applications, prepare to uncover the invisible network that could be inside your very own living room.
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AAA Protocol: Your Gateway to Secure Network Access
Dive into the world of AAA Protocol, where network security meets ease of access. Discover how Authentication, Authorization, and Accounting work to keep your network secure.
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Understanding Dynamic Adaptive Streaming over HTTP (DASH)
Explore the essentials of Dynamic Adaptive Streaming over HTTP (DASH), the technology revolutionizing media delivery online.