Articles

Everything on the site, in one place. The two big series are written to be read in order — so they are listed that way here, rather than newest-first like the front page.

Networking

From a single web request all the way down to the bits on the wire — and back out through the one address the whole lot hides behind. Start at the top. Browse the category →

Networking 101 — What actually happens between pressing Enter and the page appearing.
Envelopes All the Way Down — Encapsulation: how your data gets wrapped for each leg of its journey.
How Switches Quietly Agree Not to Set the Network on Fire — Spanning-tree, and why cable loops do not melt the network.
One Switch, Many Networks — VLANs: one physical switch pretending to be several.
Subnets Without the Scary Maths — Why we split networks up, no binary required.
Subnets, With the Maths — The binary, the masks, and the magic-number shortcut.
NAT — How ten thousand devices share one public address: SNAT, DNAT, CGNAT and hairpins.

Linux

Picking a distro, finding your feet at the console, and working up to a machine that keeps itself running. Browse the category →

So Many Linuxes — Choosing your first distro, and why on earth there are so many.
Finding Your Feet at the Console — The command line from first principles.
Everything’s a File — Where things live, and why there is no C: drive.
Permissions: Who’s Allowed to Touch It — rwx, chmod, chown, and the sticky bits.
Package Management — Installing software the safe way; Linux had an app store first.
systemd — Units, services, and teaching Linux to keep things running.

The Tech Toolbox

Hands-on with the tools themselves. Browse the category →

SSH and the Endless Connectivity — Keys, config, tunnels and hardening; the bridge between the networking and Linux series.

Field Reference

Cheatsheets — the bits you look up rather than read. Kept off the front page so they do not bury the articles. Browse them all →

Linux Cheatsheet — Everyday commands, plus the permissions table.
SSH Cheatsheet — Connect, copy, tunnel, harden.
Package Manager Cheatsheet — apt, dnf and pacman side by side.
systemd Cheatsheet — systemctl and journalctl, with the older service equivalents.
Cisco Cheatsheet — IOS modes, VLANs and trunks, TDR cable testing and hardening.

Looking for the calculators instead? They live on the Tools page — subnetting, Cisco configs, access lists, RAID and permissions, all running entirely in your browser.