Interactive Firewall Rule Simulator & Packet Flow Visualizer – Client-Side Network Security Tool
Gain crystal-clear insight into your firewall logic with our 100 % client-side Firewall Rule Simulator & Packet Flow Visualizer. 🎯
With an intuitive drag-and-drop rule builder, persistent local storage, and real-time SVG animations, you can:
• Model complex ALLOW/DENY rule-sets in seconds.
• Visually trace how individual packets are evaluated as they cross the firewall.
• Train junior analysts or demo network behaviour without spinning up VMs.
The simulator runs entirely in your browser—no packets leave your workstation—making it ideal for quick what-if analysis or classroom demonstrations.
How to use
1. Build your rule-set in the left panel. Each rule supports source/destination IP, protocol, port, and action fields.
2. Re-order rules by simply dragging them up or down.
3. Define a test packet and hit “🚀 Test Packet.” Watch the animated flow to see which rule matches.
4. Toggle dark mode 🌗 for night-time sessions.
5. Your rule-set is automatically saved in localStorage, so it’s waiting on your next visit.
Need a quick refresher on port ranges? Jump over to our handy Port Range Scanner 🔗.
For best-practice guidelines on firewall configurations, refer to the authoritative OWASP Firewall Cheat Sheet.
Ready to streamline your rule-set reviews? Try the live tool now: Firewall Rule Simulator & Packet Flow Visualizer.
