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 channel dynamics
• Session setup
• Proxy authentication
• Data handling, including Multilink PPP
• L2TP security
• SNMP management of L2TP networks
• Comparisons with L2F, PPTP, and other VPN technologies

Throughout, the book highlights implementation tips, drawn from the author's extensive practical experience, that will help you avoid potential problems and maximize the benefits of L2TP.
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With the increasing number of telecommuters and people who are mobile, remote access is now a vital part of an organizations network. The new L2TP protocol (Layer 2 Tunneling Protocol) gives enterprises unprecedented flexibility in providing cost-effective remote access. This book goes far beyond the standards documents, giving crucial information on writing L2TP code and on using L2TP for VPN deployment. Readers will discover how to implement L2TP and how L2TP addresses serious limitations in today's approaches to virtual remote access. They will also learn how L2TP can enable support for high-speed remote access via cable modems and ADSL. The book offers a step-by-step introduction to the basics of L2TP layers and protocol structures, and how it integrates with other VPN technologies. Shea provides new insights into session setup; data handling; security; and standards-based (SNMP) network management. It will be invaluable to network engineers developing remote access and VPN code and products; ISPs offering VPN services; and network professionals who need better remote access solutions.