Patent ID: 7110392

Claim:
A communicating method in a network in which a feed and receivers are connected via a unidirectional line and the feed and the receivers are respectively connected to a bidirectional line via routers, comprising the steps of: allowing a first router to transmit a first packet including a path control information and an IP header to a first receiver; allowing said first receiver to transmit a second packet obtained by capsulating the path control information and the IP header of said first packet as a path control packet to a first interface of said feed via said first router, said bidirectional line, and a second router; allowing said feed to extract said first packet by decapsulating said second packet, transmit said first packet to said second router from a second interface, and transmit said first packet to a second receiver from a third interface via said unidirectional line; and allowing said second receiver to transmit said first packet to a third router; wherein, in said first packet, a MAC header is added to the head, the IP header is subsequently added, and the path control information is located after said IP header.