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Tunneling techniques such as configured tunnel, 6to4, ISATAP and Teredo are common mechanisms in the early deployment of IPv6 to connect between two isolated IPv6 LANs or hosts by using the IPv4 infrastructure. We focused on Teredo tunnel as it allows users behind NATs to obtain IPv6 connectivity. Teredo tunnel has been designed to encapsulate IPv6 packet in UDP using IPv6-in-UDPin-IPv4 technology...