How Network Address Translator (NAT) works

The post explains how NAT (Network Address Translator) and stateful firewalls affect peer-to-peer connections and how to traverse these obstacles. Techniques like using UDP protocols, direct socket control, and tools like STUN (Session Traversal Utilities for NAT) and TURN (Traversal Using Relays around NAT) can help establish connections. Advanced strategies including simultaneous packet transmission, birthday paradox probe, and port mapping protocols are discussed to handle different types of NAT behaviors. For robust connectivity, fallback relays and Interactive Connectivity Establishment (ICE) protocols are recommended.