Gonc: Netcat with Zero-Config P2P NAT Traversal and End-to-End Encryption

Gonc – Netcat with P2P Nat Traversal

Gonc is a Golang-based netcat alternative that adds automated NAT traversal with zero configuration—just agree on a passphrase. It uses public STUN and MQTT servers for address exchange, establishes direct P2P connections (IPv6 TCP > IPv4 TCP > IPv4 UDP) with TLS 1.3 or DTLS encryption and mutual authentication. Beyond shell access and file transfer, it offers built-in SOCKS5/HTTP proxies, reverse shells with pseudo-terminal support, and flexible service configuration via -e. No relay servers; either it connects directly or fails.