| 摘要 |
Disclosed is an IP multicast distribution system that can convert IP multicast data into packets for individual unicast addresses and can transmit the data to a recipient host in a private address space. According to the present invention, before accepting streaming distribution from the distribution server, a recipient host transmits, to an NAPT gateway, a distribution request for which the IP address of an MU conversion gateway is designated as a destination address, a source port number is designated a port number, determined in advance by the distribution server, in order to enable the reception of data by a reception application provided for the recipient host, and a destination port number is designated as an acceptance port number for the MU conversion gateway. Upon receiving the distribution request, the NAPT gateway designates a source IP address as the global IP address for the NAPT gateway and the source port number as the predetermined port number, and transfers data to the MU conversion gateway.
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