The IP SLA uses the control protocol for information about a destination port on the rtr responder for a synthetic traffic. The synthetic traffic starts from the source device after OK is received from the rtr responder. But what's happend when the target device is a server (IP device with an open port for the synthetic traffic)?? Is the control protocol send to the server too?How the source device recognizes that the target device is the rtr responder or a server?? Thank you.