L2TP: Implementation and Operation

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9780201604481: L2TP: Implementation and Operation

Layer 2 Tunneling Protocol (L2TP) has emerged as a key technology in the construction of Virtual Private Networks. L2TP provides remote access capabilities to organizations using public networks for internal, private activities. It allows a corporation to retain the advantages of a private network--privacy of communication, access control, and company addressing--while reducing the need to invest heavily in networking infrastructure. L2TP: Implementation and Operation is an essential resource for anyone who works with L2TP and Virtual Private Networks. Written for developers and network managers, the book provides an overview of the protocol, a detailed explanation of L2TP architecture, a step-by-step guide to its implementation, and information on L2TP security and management. You will find useful background on the OSI model, the underlying PPP technology, how L2TP tunnels PPP, and the L2TP LAC and LNS Layer 2 roles. In addition, the book contains detailed information on such topics as: *L2TP deployment models *L2TP tunnel structure, terminology, and function *Protocol state machines *Tunnel authentication and initiation *Header and control message format, including AVP *Control c

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Review:

With its inherent support for the IPSec specifications, Layer 2 Transport Protocol (L2TP) has become a powerful tool for developers of Virtual Private Networks (VPNs). It allows for secure transmissions over an open network, and, unlike Point-to-Point Tunneling Protocol (PPTP), allows for connections to the Internet by both SLIP and PPP links. L2TP: Implementation and Operation shines a bright light on this flexible tunneling protocol that traces its lineage to both PPTP and Cisco's Layer 2 Forwarding (L2F) protocol.

The book is more than adequate as an academic and strategic overview of L2TP technologies for people thinking about deploying them on a VPN. It's also a valuable resource for programmers planning to implement L2TP in their software.

VPN administrators will appreciate author Richard Shea's presentations on various architectures for VPNs running L2TP. Presented both as clip-art diagrams that illustrate relationships among machines and as schematics that show the relationships among various protocols, the network-design material is thorough. So is Shea's dissection of the protocol--he picks each kind of L2TP message apart, explaining what the control messages say and how the data messages present their contents. With byte listings and state diagrams, he tells programmers what they need to know about L2TP behavior under various circumstances. You might want to back this book with the IPSec coverage in IPSec. --David Wall

Topics covered: Strategic advantages of L2TP, strategies for implementing L2TP on VPNs, L2TP states and transitions, control channels, session management, and security.

About the Author:

Richard Shea was a member of the founding team of New Oak Communications (now merged into Nortel Networks), where he developed PPTP, L2F, and L2TP support. He continues to work with Nortel on VPN/Extranet access products. In addition, he has worked on such technologies as FDDI, Ethernet switching, PPP remote access, and IP routing.



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