CONTROL DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a control device and a program that can determine the presence or absence of a transfer trouble of a multicast signal in a relay device.SOLUTION: A route determining unit 15 of a control device 1 determines on the basis of a response signal received by a receiver 13 whether communication routes 92, 93 used by equipment 3 can be transmitted in a multicast style. When the equipment 3 does not return any response signal to a multi-casted response request, but returns a response signal to a uni-casted second response request, the route determining unit 15 determines that it is impossible to transmit the communication route used by the equipment 3 in the multicast style.SELECTED DRAWING: Figure 1