STUN Explained: Public IP, Port Mapping, NAT Types (with Live Demos)

Published 19/02/2026

Description

“STUN” (Session Traversal Utilities for NAT) helps an endpoint learn the IP/port mapping it has as seen from the public Internet, which is key for peer-to-peer connectivity in NAT’d networks.​ STUN isn’t a complete NAT traversal solution on its own—it’s a building block used by broader traversal approaches (for example ICE) and can also be used for keep-alives and connectivity checks in specific usages.​ In this video, I explain the why (IPv4 exhaustion, NAT, CGNAT/mobile networks), the core STUN concepts, and then jump into hands-on demos: a Windows client, a .NET MAUI client, and finally the STUN library implementation. If you found it helpful, consider liking, subscribing, and sharing with anyone building a homelab or small SAN. #STUN #NATTraversal #CGNAT #Networking #WebRTC #VoIP #P2P #DotNet #CSharp #MAUI #WindowsDevelopment #SocketProgramming #TURN #NetworkEngineering #samayas #stef Don’t forget to like, subscribe, and hit the bell for more content. Subscribe to my X account https://l.samayas.eu/jo3eaYEf3E?P=YT&V=78 Buy me a Coffee : https://l.samayas.eu/jX6xL7EWhd?P=YT&V=78 Studio Equipment Camera Sony Alpha ZV-E10 II : https://l.samayas.eu/k7y90TREl0?P=YT&V=78 Secondary Camera Obsbot Tail Air : https://l.samayas.eu/iFQu9WfmCw?P=YT&V=78 Elgato Prompter : https://l.samayas.eu/fHVrqqXtSc?P=YT&V=78 Microphone Rode Wireless GO II : https://l.samayas.eu/afBINjiBXN?P=YT&V=78 Contents 0:00 - Introduction 0:08 - Description 10:11 - Windows App 11:37 - MAUI App 13:40 - STUN Library 17:44 - Conclusion