| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To dynamically join / leave a terminal to / from a multicast group from a source permitted by a network administrator in response to a request from the terminal without modifying the terminal capable of making only a join request to a multicast group from an unspecified transmission source server in a multicast network which can join only a multicast group from a specified transmission source. <P>SOLUTION: A multicast source address table 220 calculates a source server permitted by the network administrator of the multicast network on the basis of a multicast group address and a line 116 on which a join request takes place included in the join request to the multicast group from a terminal 100 supporting only a transmission source non-limited multicast so that a multicast router 110 translates the join request to the transmission source non-limited multicast group into a join request to the multicast group from the source server permitted by the network administrator. <P>COPYRIGHT: (C)2004,JPO</p> |
