Networking explained by a CCIE
Fix your internet. Pick the right router. Understand networking.
Plain-English guides, reviews and free tools from Afroz Ahmad, a senior network architect with 20 years designing enterprise, data center and service provider networks.
- CCIE Emeritus #36102
- Senior Network Architect
- 20 years: enterprise, data center, ISP
- Writing here since 2012
On YouTube
Watch networking explained on YouTube
Real outages and hacks broken down, plus networking basics and home-network fixes. New videos every week.
Subscribe on YouTubeTroubleshooting
Fix it now
The fixes readers use most: router lights, logins, no internet and gaming connections, each answered on the first screen.
TP-LinkThe Complete Guide to Understanding Your TP-Link Router Lights
TP-LinkTP-Link Router Red Light: What It Means and How to Fix It
InternetWifi Connected But No Internet: Causes, Fix, and Preventive Measures
TroubleshootingNAT Type Strict? How to Fix It on Xbox, PS5 and PC
WiFiGoogle Wi‑Fi Provisioner: What It Is and Whether You Need ItBuying guides
Best gear, picked by a CCIE
Routers, modems and switches compared on the specs that matter, checked against each maker's own pages.
Updated Nov 2026WiFi6 Best Budget Routers for Small Business (2026)Read the guide 
Modems and RoutersBest Routers for Apartments: Maximize Small Space Wi-FiRead the guide 
Internet and TV ServicesBest Modems for Xfinity in 2026 — DOCSIS 3.1 Picks That Cut Rental FeesRead the guide 
InternetBest WiFi 7 Routers: Picked by a Network EngineerRead the guide 
InternetBest PoE Switches for Home Lab and Small Business (2026)Read the guide 
InternetUniFi vs Omada vs MikroTik: Which Business Wi-Fi System to Buy in 2026Read the guide Learn networking
Understand how networks work
Start at 1 and work through: plain-English explainers on the ideas behind every fix.
Free tools
Free networking and internet tools
Eight free tools I use myself: no signup, no account, and nothing you type leaves your device. Every one runs in your browser.
Subnet Calculator
IPv4, IPv6, VLSM and wildcard masks, with the binary view.
Open the toolWi-Fi Channel Overlap Visualiser
Find the clearest 2.4, 5 or 6 GHz channel for your building.
Open the toolWho Is My ISP?
Your provider, public IP and ASN, looked up from your own connection.
Open the toolDownload Time Calculator
How long a file really takes at your line speed.
Open the toolInternet Speed Converter
Mbps to MB/s, Kbps and Gbps, plus the speed your home needs.
Open the toolCIDR to IP Range Converter
Network, broadcast and usable hosts for any CIDR block, IPv4 or IPv6.
Open the toolCommon Port Numbers
Searchable TCP and UDP reference, with what each port is for.
Open the toolWord Counter
Word count with readability and keyword analysis.
Open the toolFresh
Latest updates
Guides I have written or re-checked most recently.
InternetUniFi vs Omada vs MikroTik: Which Business Wi-Fi System to Buy in 2026
WiFi6 Best Budget Routers for Small Business (2026)
Data Center30 Mbps Speed: Is It Fast Enough in 2026?TroubleshootingNAT Type Strict? How to Fix It on Xbox, PS5 and PC
Mesh WiFieero Red Light: What It Means and How to Fix It
Internet and TV ServicesXfinity Router or Modem Blinking Green: Causes and Fixes