Fast duplicate address detection entity for managing information for fast duplicate address detection in distribution system and fast duplicate address detection method using the same

摘要

A fast Duplicate Address Detection (DAD) Entity in a distribution system including multiple Access Points and multiple mobile nodes associated therewith. The fast DAD entity includes a memory unit for storing an address table recording information including IP addresses of the multiple mobile nodes; an interface unit for receiving Neighbor Solicitation messages that includes an IP address from a mobile node newly associated with the distribution system; a record unit for extracting the IP address of new mobile node from the Neighbor Solicitation messages, and recording the IP address in the address table; a search unit for searching the IP addresses of the multiple mobile nodes stored in the address table; a decision unit for comparing the IP address of the new mobile node with the IP addresses of the multiple mobile nodes already configured with the sub-network, and deciding whether there already present the same IP address; and a control unit for generating a response message notifying that the IP address of the new mobile node is confirmed as unique and can be used as new Care-of Address (CoA), and sending the response message to the new mobile node through the interface unit, if there does not exist the same IP address as a result of the decision of the decision unit.