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5d65416227
An interface may have multiple MAC addresses, that leads to the problem when looking up hostname for its multiple <ip, mac> pairs, because the "ip" map, which storing "mac => ip" mapping can only store 1 entry. It ends up returns an empty hostname for a known MAC address. Fixing this by filling empty hostname based on clients which is already listed, ensuring all clients with the same MAC address will have the same hostname information.