Software-Defined Overlay Networks: WireGuard, NAT Traversal, and Mesh Routing Guide
A comprehensive architectural deep dive into peer-to-peer software-defined overlay mesh networks: WireGuard Cryptokey Routing and Noise protocol, the physics of NAT traversal (STUN, ICE, UDP hole punching, Symmetric vs. Cone NATs), encrypted relay fallbacks (DERP), and building zero-trust mesh networks.