Patent ID: 7693160

Claim:
An information processing device for making communications through a communications processing device handling the communications, the information processing device comprising: a bubble packet transmitter for transmitting a bubble packet via the communications processing device, the bubble packet being a packet for leaving a transmission history within the communications processing device; a type determination packet transmitter for transmitting a type determination packet through the communication processing device, the type determination packet being a packet used for determining a type of the communications processing device; and a detecting packet transmitter for transmitting a detecting packet via the communications processing device, the detecting packet being a packet used for detecting a position of a bubble packet transmission port defined as one of ports of the communications processing device used for transmitting the bubble packet, the detecting packet transmitted in a manner that a detecting packet transmission port where the detecting packet passes through becomes the same as or different from the bubble packet transmission port, depending on a type of the communications processing device which is determined based on the type determination packet.