Abstract
In mobile IPv6 networks, duplicate address detection (DAD) process is necessary for confirming uniqueness of IPv6 address when mobile node moves to a new network. In standard IPv6 protocol, DAD delay takes at least 1000 ms. It is desirable to reduce DAD delay especially if nodes wish to run real-time applications on the mobile IPv6 networks. This paper proposes fast and robust DAD (FR-DAD) to improve handover delay and provide reliability and backward compatibility with standard IPv6 networks. FR-DAD is a semi-stateful address assignment system. It utilizes a server that manages a list of unique IPv6 addresses. Simulations show FRDAD successfully reduces delay by as much as 99.74% of standard DAD delay, in best case. In the worst case, FR-DAD still outperforms a similar stateful DAD technique by as much as 23%. FR-DAD can provide unique IPv6 addresses for mobile nodes quickly and reliably without adding any more overhead to the network than previous techniques.
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