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Mobile IPv6 is a network-layer mobility protocol for the IPv6 Internet. Route optimization mechanism in IPv6 offers an efficient routing option to mobile IPv6 than that is available for mobile IPv4. The protocol includes security mechanisms, such as the return-routability tests for security of route optimization mechanism. This paper explains the threat model and existing security solutions for route optimization. An improved, robust and simple security solution is also presented based on IPSec, which is an inbuilt security feature of IPv6.
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