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Proxy DAD ASN GW Maintains Address Cache Learns the addresses from DAD NS, if the address is not duplicate Defends the addresses in the Address Cache in case an MS generates a duplicate address Checking for IID matching may be considered as duplicate Address Cache entries expire when Prefix life time expires MS or another entity deregisters explicitly R6 GRE tunnel for the MS is deleted NS/NA exchange with longer intervals Issues Address Cache overflow ASN GW can limit the no. of addresses an MS can have at a given time |