REQ-4: compatibility The DMM solutions SHALL support existing network deployment with IPv6 (e.g. existing IPv6 address assignment), be compatible with other mobility protocols, and be interoperable with the network or the mobile hosts/routers that do not support the DMM enabling protocol so that the existing network deployments are unaffected.
REQ-4M (Motivation for REQ-4) Motivation: The motivation of this requirement is to be able to work with network architectures of both hierarchical networks and flattened networks, so that the mobility management protocol possesses enough flexibility to support different networks, and so that the existing networks and hosts are not affected and do not break. OTHER related problem O-PS3: Complicated deployment with too many variants and extensions of MIP Deployment is complicated with many variants and extensions of MIP. When introducing new functions which may add to the complicity, existing solutions are more vulnerable to break. (The above has been drafted with contributions, inputs and discussions from various people. Additional contributions and comments are most welcome.) H Anthony Chan
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