| 摘要 |
PROBLEM TO BE SOLVED: To prevent transfer of an unwanted multicast packet. SOLUTION: Terminal devices 113B-2 and 113C-1 belonging to a multicast group B each transmit a multicast address notice packet in which a multicast address B corresponding to the multicast group B is set as a transmission source at a predetermined timing to a broadband router 111. The broadband router 111 and layer 2 switches 112A-112C each learn the multicast address B in a port at which the multicast address notice packet has been received. The packet of the multicast group B transmitted from a multicast server 251 is transferred through a port which has learned the multicast address B, and received by terminal devices 113B-2 and 113C-1. This system and method are applicable to a home network system, for example. COPYRIGHT: (C)2009,JPO&INPIT
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