Probable fix for GitHub issue #63 - do not unite() if either path is TCP, since doing so can result in asymmetric failed NAT-t over UDP if one side has a firewall that permits outgoing UDP but not incoming.

node/Peer.hpp

@@ -136,9 +136,9 @@ public:
 	 * @param data Data to send
 	 * @param len Length of packet
 	 * @param now Current time
-	 * @return True if packet appears to have been sent, false if no path or other error
+	 * @return Type of path used or Path::PATH_TYPE_NULL on failure
 	 */
-	bool send(const RuntimeEnvironment *_r,const void *data,unsigned int len,uint64_t now);
+	Path::Type send(const RuntimeEnvironment *_r,const void *data,unsigned int len,uint64_t now);
 
 	/**
 	 * Send firewall opener to all UDP paths