IT professional writing about cybersecurity, cloud & DevOps, automation, networking, and systems administration. Real-world guides for real-world problems.
Group Policy normally applies in a clean two-track way: Computer Configuration follows the computer wherever it goes, User Configuration follows the user wherever they sign in. That clean separation breaks…
Group Policy is the centralised configuration system that drives every domain-joined Windows endpoint — security baselines, drive maps, software restrictions, audit settings, the lot. The mechanics are well-documented; the design…
The Australian Cyber Security Centre’s “Hardening Microsoft Windows 10 and Windows 11 Workstations” publication (last updated July 2024) is one of the more comprehensive endpoint-hardening references the security community has.…
Networking from Scratch (lesson 17) — why 2.4 GHz only has three usable channels, the practical 5 GHz channel plan, what 6 GHz changes, the AP-placement and power decisions that beat any equipment upgrade, the 802.11k/v/r fast-roaming trio, band steering, minimum data rates, and the RSSI/SNR/utilisation thresholds that turn Wi-Fi performance complaints into numbers.
Networking from Scratch (lesson 16) — how the 4-byte 802.1Q tag splits one switch into many logical networks, what access and trunk ports actually do, why the native VLAN bites people, voice-VLAN multiplexing, why DTP is usually disabled, and the verification commands that make switch CLI output debuggable.
Networking from Scratch (lesson 15) — the three flavours of NAT (static, dynamic, PAT), how port translation actually multiplexes one public IP across hundreds of inside hosts, the conntrack table that makes it work, why STUN/TURN/ICE exist, what CGNAT does to your mobile traffic, and why IPv6 throws the whole machinery away.
Networking from Scratch (lesson 14) — how a 128-bit IPv6 address is built and compressed, why every interface has three of them at once, how SLAAC lets a host self-configure with no DHCP, what replaces ARP and broadcast, the privacy extensions that change your address daily, and the dual-stack reality that’s still the norm 25 years in.
Networking from Scratch (lesson 13) — twenty-five subnetting practice problems across five difficulty tiers (classful warm-up, /25-/30 in the 4th octet, octet-boundary, VLSM carving, real-world planning) with step-by-step solutions for every one. Designed to take you from "I read the math" to "subnetting is reflexive" in one sitting.
