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End-to-End DSL Architectures by Wayne C. Vermillion

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L2TP Tunneling

Layer 2 Tunneling Protocol (L2TP) is an emerging IETF standard that combines the best features of two existing tunneling protocols: Cisco's L2F and Microsoft's Point-to-Point Tunneling Protocol (PPTP). L2TP supports multiple protocols, as well as private IP addresses, over the Internet. This section describes the components of an L2TP tunnel, identifies the encapsulations supported over an L2TP tunnel, and describes L2TP connectivity.

Using L2TP, an ISP or other access service can create a virtual tunnel to link the customer's remote sites or remote users with corporate home networks. Think of a field employee who must dial in from different remote sites and who needs direct access to her company's intranet. This employee's corporate ...

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