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Tunneling

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Tunneling is also referred to as encapsulation because the original packet is hidden or encapsulated inside of a new packet. A tunnel is the logical data path through which the encapsulated packets travel to their destination. For additional information about tunneling concepts or L2TP integration with IPSec, see "Virtual Private Networking" in the Windows   2000 Internetworking Guide . The following sections are related to IPSec tunneling only.