In order to guarantee the security of the communication between the in-vehicle IPv6 subnet and internet, a scheme is putted forward based on the address filtering in the network handoff. This scheme considers the address filtering in the network handoff, when the mobile node came into a different network, it only needs to filter its own IPv6 address without the need to re-access authentication. Tests show that the scheme can not only guarantee the security of the network handoff but also meet the time demand of the system.
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