VPN diagnostic tools: seven guides to audit your connection
Seven articles to measure, verify and audit what your VPN actually protects - IP, DNS leaks, real speed, tunnel integrity. Every tool explained, every method reproducible.
Why diagnose your VPN?
Turning a VPN on is not enough. Between WebRTC leaks, DNS servers bypassing the tunnel, protocols silently degrading speed and badly-detected regions, most users believe they're protected when they're only halfway covered.
These seven guides cover the full audit cycle: knowing your real IP, testing for leaks, measuring before/after speed, verifying the tunnel works and auditing security end-to-end. No theory - only steps you can reproduce in five minutes.
Combined with our four free interactive tools (IP, DNS, speed, geo-blocking), you build a monthly verification routine that catches any configuration regression.
The 7 guides in this cluster
- 11 min
My IP address is exposed: what to do to protect myself NOW
Just discovered your real IP is visible somewhere and wondering what it means? Here's what it actually reveals, how to check what else is leaking beyond the IP (DNS, WebRTC), and the concrete steps to protect yourself today.
Read - 9 min
Complete VPN leak test 2026: DNS, WebRTC, IPv6, MTU, kill switch - unified methodology
An active VPN doesn't guarantee anonymity. Complete method to test DNS, WebRTC, IPv6, MTU and kill switch in 30 minutes. Open-source CLI tools dns-leak-detector-cli + webrtc-leak-detector with thresholds to interpret your own results.
Read - 23 min
VPN security audit: 9 tests to check yours
Exhaustive checklist: IP, DNS/WebRTC leaks, kill switch, speed, logs, jurisdiction. Our step-by-step testing protocol with free tools. Takes 25 minutes.
Read - 14 min
Verify your VPN actually works: 5-minute quick check (2026)
Your VPN's green icon proves nothing: your browser may leak via WebRTC, DNS, or IPv6 despite the green check. Here's the quick 5-step check-list to confirm your traffic actually goes through the tunnel.
Read - 10 min
Test your VPN speed in 2026: complete method + thresholds by use case
How much does your VPN really slow you down? Here's the rigorous method to measure download, upload, and latency with and without VPN - tools, protocol, thresholds by use case (4K streaming, gaming, video calls).
Read - 15 min
DNS leak explained: the 4 causes and the fix for Windows, macOS, Linux and iOS (2026)
A DNS leak means your ISP still sees every domain you visit despite the VPN. Check it in 30 seconds with our tool, then fix the cause: Windows Smart Multi-Homed DNS, browser DoH, missing VPN DNS, untunneled IPv6.
Read - 11 min
What Your IP Address Reveals About You: Provider, Location and Cookieless Tracking
Your public IP isn't just a string of numbers. Here's what sites deduce in under 50 ms - ISP, country, city, traceability - and how to decide whether to hide it.
Read
Free interactive tools
Four browser-side instruments. Zero install. Results in under 5 minutes.
Cluster pillar
Want the full audit protocol in a single article?
Read the complete VPN security audit →Sources & references
To dig deeper, here are the technical and institutional references we routinely consult.