How the Internet Works for Kids: What Really Happens When You Open a Website?
A child types a website address, presses Enter, and a colourful webpage appears almost instantly. To them, the process seems straightforward. Type a…
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InfiniBand Architecture First Principles: Physical Link Rates, Credit-Based Link Flow Control, and Subnet Manager Fabric Orchestration
Introduction: The Dedicated Arteries of Supercomputing — Native InfiniBand In Chapter 9 of our series, RDMA High-Performance Networking Foundations:…
LanCache Router: Routing and Failover for Technitium
A local game cache is useful until DNS sends a room full of PCs to a cache that has gone offline. There is another wrinkle when you have several VLA…
CompTIA Network+: Troubleshooting Cabling, Interfaces, & Network Services
Introduction Network troubleshooting involves identifying and resolving problems that affect connectivity, performance and availability. Network iss…
CompTIA Network+: Network Security Concepts & Solutions
1. Introduction Network security protects an organisation's data, devices, applications, and network infrastructure from unauthorised access, misuse…
Docker 29.8+: Swarm containers can't reach their own node's ports under ufw
TL;DR : On Docker 29.9.1 with Swarm and ufw (default deny incoming), a container on an overlay network that connects to an ingress-published port on…
How I built a 99.9% uptime home server for $300 - lessons from 2 years of outages
After 2 years of running a home server for personal use, here's what actually drove uptime from ~95% to 99.9%. Spoiler: it's mostly boring. What I w…
One AWS account, several environments, and tags as the only map
How VPC Atlas draws and inventories one environment of a shared AWS account with its new tag filter, and what it leaves out. When the account is the…
The AWS network inventory, now also a CSV you can filter
What the VPC Atlas inventory holds, the four formats it comes in, and why I made the CSV one flat row per resource. The diagram is the picture, the…
Your Firewall Already Saw the Attack: Bringing AI Detection to Network Logs
Endpoint agents are good at seeing what happens on a machine. But a lot of an attack happens between machines: the scan that finds an exposed servic…
Spoofing WiFi MAC Addresses with a Windows Kernel Driver
1. What a MAC address is A MAC address is six bytes. Convention writes them as hex pairs separated by colons: A4:5E:60:C3:1B:07 The first three byte…
HANDS-ON NETWORKING LAB: Configuring 20 PCs, 1 DHCP Server, and 2 Switches
As part of my practical networking journey, I worked on a small office network infrastructure consisting of 20 client PCs, 1 DHCP server, and 2 swit…
NAT Gateway vs VPC Endpoints: Which Path Should Your Private AWS Traffic Take?
Private subnets are one of the first good habits you learn in AWS. Put your EC2 instances, containers and databases where the internet cannot start…
How to Test If Your DDoS Protection Actually Works (Before an Attacker Shows You)
Your CDN dashboard says "attack mitigated". Your origin server says otherwise. One of them is lying, and finding out which one — before a real attac…
Wi-Fi or VPN sign-in failing after a Windows update? What to check
When a user says their Wi-Fi or VPN stopped working after an update, there are quite a few things to check. Drivers, connection profiles, credential…
How to find the closed port that stops an EC2 web page loading, and lock down SSH
You launched an Amazon EC2 instance, installed a web server, and typed its public address into a browser. The tab spins and then times out. Nothing…
Debugging nighttime PoE camera restarts: power, cable and recording checks
A PoE camera can work during the day and restart when its lighting activates. Power is one possible cause; a frozen live view alone does not prove a…
Works on desktop, fails on phones: the post-quantum TLS bug hiding in your network card
Modern browsers now send a larger TLS hello. On some Windows servers, a receive-offload bug in the network card silently breaks about half of those…
Clean Shutdown and Restart Order for a Small Office in a Texas Grid Emergency
A small office survives a Texas grid emergency by shutting down cleanly before the power drops and restarting in dependency order after it returns.…
MiBee Steward v0.7.3: schema break, a Rust agent, and four bugs only the field could find
The agent went quiet for 19 minutes and systemd stayed green On 2026-10-12 I rebuilt the database of my own main center. Nineteen minutes later I no…
SQL Server for Genetec Security Center
When a Security Center system slows down, the first suspect is usually the Archiver and the second is the network. In my experience the database is…
"Connected, But No Internet": Check for a 169.254 Address First
A user calls the help desk: "My Wi-Fi says connected, but nothing loads." Before restarting the router or reinstalling network drivers, spend 30 sec…