pwnat

pwnat is a NAT traversal research tool created to demonstrate communication between clients and servers located behind separate NAT devices. It explores a technique for establishing connectivity without traditional port forwarding, DMZ configuration, or an external relay server. The project is written in C and focuses on low-level networking behavior. It is relevant for people studying NAT behavior, firewall traversal, peer-to-peer connectivity, and internet routing limitations. Because router behavior has changed over time, the technique should be treated as a historical and experimental networking project rather than a guaranteed modern solution. Its main value is explaining how NAT assumptions can be challenged and why network boundary behavior is complex.