void checkECN ();
void ECNPathCheckTest(u_int32_t sourceIpAddress, u_int16_t surcePort,
u_int32_t targetIpAddress, u_int16_t targetPort, int mss);
+void SynTest(u_int32_t sourceIpAddress, u_int16_t surcePort, u_int32_t targetIpAddress, u_int16_t targetPort, int mss, int syn_reply);