Libraries for NAT traversal and hole punching

Notes

• NAT relaying (using accessible server S to forward packets between A and B) - TURN protocol
• Connection reversal (via server S, but while only one of A, B is behind NAT)
• UDP Hole punching (via server S)
• hairpin (loopback) translation?

Relevant documents

• NAT-PMP RFC
• Port Control Protocol
• UPnP

Relevant libraries

• miniupnpc
• libnatpmp
• upnp based on upnp implementation in ktorrent
• pupnp (BSD License) latest update Apr 2012, first code 2005
• http://www.keymolen.com/ssdp.html C++ SSDP library, non-OSS
• https://code.google.com/p/upnpx/ objc/C++ upnp and ssdp lib, BSD License, based on pupnp, abandoned Nov 2012
• reTurn C++ asio BSD STUN and TURN library
• nat-pmp and upnp implementation in maidsafe 2009