Fast and robust duplicate address detection for Mobile IPv6

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.