To solve the problems of current IP multicast which includes poor inter-domain many-to-many group support,security vulnerabilities and dependency to specific multicast infrastructure,a mobile accessible closed multi-part group (MACMPG) commu-nication protocol in IPv6 network is proposed. By extending the single source multicast protocol,the communication channel for multi-part group communication across domains is established. Based on IPv6 CGA,the secure closed group communication scheme is designed. The access to the multicast traffic only con-fined to the authorized senders and receivers and only trusted routers are allowed to be the branch points of MACMPG tree. By tunneling mechanism,the MACMPG traffic can be transmitted across non-MACMPG routing area,and the mobile nodes can join the group remotely and roam freely between domains,which eliminates the dependency on specific IP multicast routing.
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