Network Library

• RakNet – http://www.jenkinssoftware.com/
• Valve GameNetworkingSockets – https://github.com/ValveSoftware/GameNetworkingSockets
• ENet (Reliable UDP networking library) – http://enet.bespin.org/
• UDT (UDP-based Data Transfer) – http://udt.sourceforge.net/

LEDBAT (Low Extra Delay Background Transport)

• uTP – http://www.utorrent.com/documentation/utp
• IETF LEDBAT Status Page – http://tools.ietf.org/wg/ledbat/
• libutp – https://github.com/bittorrent/libutp

RFC

• RFC 5128 (State of P2P Communication across NATs) – http://tools.ietf.org/html/rfc5128
• RFC 2663 (IP Network Address Translator (NAT) Terminology and Considerations) – http://tools.ietf.org/html/rfc2663
• RFC 4787 (Network Address Translation (NAT) Behavioral Requirements for Unicast UDP) – http://tools.ietf.org/html/rfc4787
• RFC 3022 (Traditional IP Network Address Translator (Traditional NAT)) – http://tools.ietf.org/html/rfc3022

UPnP

• UPnP Specifications – http://upnp.org/sdcps-and-certification/standards/
• [Intel] Developer Tools for UPnP – http://opentools.homeip.net/dev-tools-for-upnp
• [MSDN] UPnP APIs – http://msdn.microsoft.com/en-us/library/aa382303(VS.85).aspx
• MiniUPnP library – http://miniupnp.tuxfamily.org/
• libnatpmp library – http://miniupnp.tuxfamily.org/libnatpmp.html

Misc.

• [MSDN] ICS(Internet Connection Sharing) / ICF(Internet Connection Firewall) – http://msdn.microsoft.com/en-us/library/aa364733(v=VS.85).aspx
• Peer-to-peer communication across Network Address Translators – http://www.brynosaurus.com/pub/net/p2pnat.pdf