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        Title           : Mobility Support for IPv4 and IPv6 Interconnected 
                          Networks based on Dual-Stack Model
        Author(s)       : S. Tsao, J. Liu, W. Boehm
        Filename        : draft-tsao-mobileip-dualstack-model-02.txt
        Pages           : 8
        Date            : 02-Mar-01
        
To support IP mobility, mobile IPv4 was designed for IPv4 network 
and the mobility extension for IPv6 has been also drafted. However, 
mobile IPv4 and mobile IPv6 are not compatible to each other so 
that a mobile IPv4 host can not function properly while it changes 
its point of attachment to IPv6 networks and vice versa. The 
document specifies an architecture and mechanisms to solve mobility 
problems in IPv4 and IPv6 interconnected networks. The solution 
presents a dual stack model that implements a new address mapper 
on mobile hosts. The address mapper on a mobile host associates the 
home address in one protocol such as IPv4 with a care-of-address 
in the other protocol, i.e. IPv6. It dispatches IPv4/IPv6 packets 
to proper layers of the protocol stack, and provides transparent 
services to upper layers regardless of the attached networks. 
Therefore, the new architecture facilitates the mobility of hosts 
in IPv4 and IPv6 interconnected networks.

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