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The authors identify issues in current IPv6 privacy extensions and propose improvements that significantly enhance both the flexibility and functionality, to protect a client from being tracked as it moves between different IPv6 networks. This is achieved by generating a new interface identifier for each visited network. They discuss a preliminary Linux implementation of the proposal. The problem they address is that of tracking users based solely on IP address information. More specifically, for an adversary who has recorded multiple IPv6 addresses, it should be hard for them to identify two or more of those addresses as corresponding to the same client.
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