A system includes a first information processing device that is a transmission destination of a packet, a second information processing device that is configured to relay the packet between a first port and a second port of the second information processing device, a third information processing device that is a transmission source of the packet, and a control device includes a processor configured to execute a process including setting the first information processing device so that a first request packet for resolving an address including first identification information that identifies the first information processing device is not received, making the second information processing device transmit a first confirmation packet including second identification information via the first port, making the third information processing device transmit the first request packet, and making the second information processing device transmit a first response packet for the first request packet via the first port.