XSTUNT Library(STUNT Library in C/C++)

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What is STUNT

STUNT Simple Traversal of UDP Through NATs and TCP too (STUNT), which extends STUN to include TCP functionality, is a lightweight protocol that allows applications running behind a NAT to determine external IP and port-binding properties, packet filtering rules and various timeouts associated with TCP connections through the NAT. The originator can be referred from http://nutss.gforge.cis.cornell.edu/stunt.php.
XSTUNT is a C/C++ library which implements "STUNT #2" approach in "Characterization and Measurement of TCP Traversal through NAT and Firewalls". It provides programmers with a set of simple functions to create STUNT connections through cooperating with a particular XSTUNT server.
XSTUNT helps to establish a direct TCP session if a destination is behind a NAT. Use the plain TCP connection if a destination is in the public internet.

XSTUNT Client Win32 Lib Win32 Dll (built by MS VC++ 7) Library 1.0
XSTUNT Server Linux 1.0
Echo Server/Client Sample 1.0: xecho Win32 Linux
News: Experimental servers (59.124.31.21/59.124.31.19) are not running anymore, so to setup a XSTUNT server is necessary before your test. I apologize for this inconvenient.

Run xecho on two machines behind "DIFFERENT" NATs or you may get ERR_SAME_NAT(-3975). To handle this kind of problem (hairpin), please read the section: XConnect in the reference.