IPv6 mobile communications will be introduced in the near future, because the numerical quantity of IPv4 addresses is insufficient. Therefore, the solution for IPv4-IPv6 mobile communication should be studied. In this paper, the system which extends capabilities of a home agent, the system which extends a mobile host, and the system which extends a translator were proposed. Furthermore, the system which builds a dual home network, and the system using a dual link agent were proposed. The proposed 5 methods are evaluated by member of messages required.
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