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How DNS, email, SSL, and web infrastructure actually work — explained clearly.
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Why 1.1.1.1 Reaches Different Servers Worldwide — Anycast, DNS Propagation, and the 13 Root Nameservers That Are Really 1,500
Network Diagnostics: The Systematic Workflow From Ping to Port Scan
A systematic diagnostic workflow finds network problems in minutes: ping → DNS lookup → traceroute → port scan. Each tool answers a specific question and eliminates a layer. Here's the complete process, what each result means, and how to distinguish local problems from remote ones.
Cloud Security Groups: AWS, GCP, Azure — Common Misconfigurations and How to Audit Them
Every major cloud breach has the same pattern: legitimate infrastructure, misconfigured security groups. Here's how AWS Security Groups, GCP Firewall Rules, and Azure NSGs work, the most common dangerous misconfigurations (databases open to 0.0.0.0/0), and why scanning your own cloud infrastructure is security hygiene.
Email Provider Migration: The Correct MX Record Sequence to Avoid Losing Email
Switching email providers is one of the most common causes of lost email. Here's the correct migration sequence (never update MX first), how Google Workspace, Microsoft 365, and Zoho Mail configure their MX records, and how to verify after migration.
IP Geolocation: How It Works, Why City-Level Accuracy Is Unreliable, and the VPN Problem
IP geolocation is 95–99% accurate at country level and 50–80% accurate at city level — and VPN users are always wrong by design. Here's how geolocation databases work, the legitimate business uses, the VPN problem for geo-dependent services, and what an IP lookup actually reveals beyond location.
DNS Providers Compared: Cloudflare vs Route 53 vs Google Cloud DNS — and Why It Matters
Registrar DNS is almost always the weakest option — slow global performance, poor TTL flexibility, and limited routing features. Here's how Cloudflare, Route 53, and Google Cloud DNS compare on performance, pricing, and features, and how to move DNS without moving your domain registration.
DNS as a Security Tool and Target: Cache Poisoning, Hijacking, and DNSSEC
DNS cache poisoning, DNS hijacking, and DNS tunneling are real attack vectors. Here's how each works, what DNSSEC does (and doesn't) protect against, how to monitor your own DNS records for unexpected changes, and what domain shadowing is.
Domain Squatting and Typosquatting: How to Detect and Defend Against Brand Impersonation
Typosquatters register domains like examp1e.com and brand-support.com to phish customers and intercept traffic. Here's the patterns attackers use, how to monitor for lookalike registrations using CT logs and DNSTwist, defensive registration strategy, and UDRP dispute resolution.
What Your Ping Number Actually Means — Latency, Jitter, and Packet Loss Explained
50ms latency is fine for browsing but problematic for gaming and VoIP. Here's what ping RTT actually measures, latency thresholds for different applications, why jitter and packet loss often matter more than average latency, and what bufferbloat is.
Reading DMARC XML Reports: What Every Field Means and How to Spot Problems
DMARC aggregate reports are XML files that arrive by email and most people never open. Here's exactly what each field means, the common patterns and what they signal (SPF fail but DMARC pass, alignment failures, unknown IPs), and the tools that make reports readable.
The Complete Email Authentication Audit: How to Check SPF, DKIM, DMARC, PTR, and BIMI
Most organisations have never systematically audited their full email authentication stack. Here's the complete 8-step process: inventorying all sending services, auditing SPF, DKIM, DMARC, PTR, and BIMI, sending a test to verify all pass, and setting up ongoing monitoring.
Email Deliverability Beyond Authentication: Reputation, Engagement, and IP Warming
SPF, DKIM, and DMARC prove you're legitimate — but engagement rates, complaint rates, list hygiene, and domain age determine whether you land in inbox or spam. Here's the deliverability signals major providers actually use, IP warming schedules, and the 2024 Google/Yahoo requirements in practice.
CAN-SPAM vs GDPR vs CASL: Email Marketing Compliance for International Senders
CAN-SPAM, GDPR, and CASL have different models (opt-out vs opt-in) and very different penalties. Here's what each requires, how they differ in a practical comparison matrix, and the compliance approach for organisations sending internationally to all three jurisdictions.
