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Advanced IPSec VPN Design

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The definitive design and deployment guide for secure virtual private networks
  • Learn about IPSec protocols and Cisco IOS IPSec packet processing
  • Understand the differences between IPSec tunnel mode and transport mode
  • Evaluate the IPSec features that improve VPN scalability and fault tolerance, such as dead peer detection and control plane keepalives
  • Overcome the challenges of working with NAT and PMTUD
  • Explore IPSec remote-access features, including extended authentication, mode-configuration, and digital certificates
  • Examine the pros and cons of various IPSec connection models such as native IPSec, GRE, and remote access
  • Apply fault tolerance methods to IPSec VPN designs
  • Employ mechanisms to alleviate the configuration complexity of a large- scale IPSec VPN, including Tunnel End-Point Discovery (TED) and Dynamic Multipoint VPNs (DMVPN)
  • Add services to IPSec VPNs, including voice and multicast
  • Understand how network-based VPNs operate and how to integrate IPSec VPNs with MPLS VPNs
Among the many functions that networking technologies permit is the ability for organizations to easily and securely communicate with branch offices, mobile users, telecommuters, and business partners. Such connectivity is now vital to maintaining a competitive level of business productivity. Although several technologies exist that can enable interconnectivity among business sites, Internet-based virtual private networks (VPNs) have evolved as the most effective means to link corporate network resources to remote employees, offices, and mobile workers. VPNs provide productivity enhancements, efficient and convenient remote access to network resources, site-to-site connectivity, a high level of security, and tremendous cost savings. "IPSec VPN Design" is the first book to present a detailed examination of the design aspects of IPSec protocols that enable secure VPN communication. Divided into three parts, the book provides a solid understanding of design and architectural issues of large-scale, secure VPN solutions. Part I includes a comprehensive introduction to the general architecture of IPSec, including its protocols and Cisco IOSĀ® IPSec implementation details. Part II examines IPSec VPN design principles covering hub-and-spoke, full-mesh, and fault-tolerant designs. This part of the book also covers dynamic configuration models used to simplify IPSec VPN designs. Part III addresses design issues in adding services to an IPSec VPN such as voice and multicast. This part of the book also shows you how to effectively integrate IPSec VPNs with MPLS VPNs. "IPSec VPN Design" provides you with the field-tested design and configuration advice to help you deploy an effective and secure VPN solution in any environment. This security book is part of the Cisco PressĀ® Networking Technology Series. Security titles from Cisco Press help networking professionals secure critical data and resources, prevent and mitigate network attacks, and build end-to-end self-defending networks.
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Table of Contents

Introduction Chapter 1 Introduction to VPNs Motivations for Deploying a VPN VPN Technologies Layer 2 VPNs Layer 3 VPNs Remote Access VPNs Summary Chapter 2 IPSec Overview Encryption Terminology Symmetric Algorithms Asymmetric Algorithms Digital Signatures IPSec Security Protocols IPSec Transport Mode IPSec Tunnel Mode Encapsulating Security Header (ESP) Authentication Header (AH) Key Management and Security Associations The Diffie-Hellman Key Exchange Security Associations and IKE Operation IKE Phase 1 Operation IKE Phase 2 Operation IPSec Packet Processing Summary Chapter 3 Enhanced IPSec Features IKE Keepalives Dead Peer Detection Idle Timeout Reverse Route Injection RRI and HSRP Stateful Failover SADB Transfer SADB Synchronization IPSec and Fragmentation IPSec and PMTUD Look Ahead Fragmentation GRE and IPSec IPSec and NAT Effect of NAT on AH Effect of NAT on ESP Effect of NAT on IKE IPSec and NAT Solutions Summary Chapter 4 IPSec Authentication and Authorization Models Extended Authentication (XAUTH) and Mode Configuration (MODE-CFG) Mode-Configuration (MODECFG) Easy VPN (EzVPN) EzVPN Client Mode Network Extension Mode Digital Certificates for IPSec VPNs Digital Certificates Certificate Authority-Enrollment Certificate Revocation Summary Chapter 5 IPSec VPN Architectures IPSec VPN Connection Models IPSec Model The GRE Model The Remote Access Client Model IPSec Connection Model Summary Hub-and-Spoke Architecture Using the IPSec Model Transit Spoke-to-Spoke Connectivity Using IPSec Internet Connectivity Scalability Using the IPSec Connection Model GRE Model Transit Site-to-Site Connectivity Transit Site-to-Site Connectivity with Internet Access Scalability of GRE Hub-and-Spoke Models Remote Access Client Connection Model Easy VPN (EzVPN) Client Mode EzVPN Network Extension Mode Scalability of Client Connectivity Models Full-Mesh Architectures Native IPSec Connectivity Model GRE Model Summary Chapter 6 Designing Fault-Tolerant IPSec VPNs Link Fault Tolerance Backbone Network Fault Tolerance Access Link Fault Tolerance Access Link Fault Tolerance Summary IPSec Peer Redundancy Simple Peer Redundancy Model Virtual IPSec Peer Redundancy Using HSRP IPSec Stateful Failover Peer Redundancy Using GRE Virtual IPSec Peer Redundancy Using SLB Server Load Balancing Concepts IPSec Peer Redundancy Using SLB Cisco VPN 3000 Clustering for Peer Redundancy Peer Redundancy Summary Intra-Chassis IPSec VPN Services Redundancy Stateless IPSec Redundancy Stateful IPSec Redundancy Summary Chapter 7 Auto-Configuration Architectures for Site-to-Site IPSec VPNs IPSec Tunnel Endpoint Discovery Principles of TED Limitations with TED TED Configuration and State TED Fault Tolerance Dynamic Multipoint VPN Multipoint GRE Interfaces Next Hop Resolution Protocol Dynamic IPSec Proxy Instantiation Establishing a Dynamic Multipoint VPN DMVPN Architectural Redundancy DMVPN Model Summary Summary Chapter 8 IPSec and Application Interoperability QoS-Enabled IPSec VPNs Overview of IP QoS Mechanisms IPSec Implications for Classification IPSec Implications on QoS Policies VoIP Application Requirements for IPSec VPN Networks Delay Implications Jitter Implications Loss Implications IPSec VPN Architectural Considerations for VoIP Decoupled VoIP and Data Architectures VoIP over IPSec Remote Access VoIP over IPSec-Protected GRE Architectures VoIP Hub-and-Spoke Architecture VoIP over DMVPN Architecture VoIP Traffic Engineering Summary Multicast over IPSec VPNs Multicast over IPSec-protected GRE Multicast on Full-Mesh Point-to-Point GRE/IPSec Tunnels DMVPN and Multicast Multicast Group Security Multicast Encryption Summary Summary Chapter 9 Network-Based IPSec VPNs Fundamentals of Network-Based VPNs The Network-Based IPSec Solution: IOS Features The Virtual Routing and Forwarding Table Crypto Keyrings ISAKMP Profiles Operation of Network-Based IPSec VPNs A Single IP Address on the PE Front-Door and Inside VRF Configuration and Packet Flow Termination of IPSec on a Unique IP Address Per VRF Network-Based VPN Deployment Scenarios IPSec to MPLS VPN over GRE IPSec to L2 VPNs PE-PE Encryption Summary Index

Promotional Information

As the numbers of remote branches and work-from-home employees grows throughout corporate America, VPNs are becoming essential to both Enterprise networks and Service providers. IPSec is one of the more popular technologies for deploying IP based VPNs. IPSec VPN Design provides a solid understanding of design and architectural issues of IPSec VPNs. Some books cover IPSec protocols, but they do not address overall design issues. This book fills that void. IPSec VPN Design consists of three main sections. The first section provides a comprehensive introduction to the IPSec protocol, including IPSec Peer Models. This section also includes an introduction to site-to-site, network-based, and remote access VPNs. The second section is dedicated to an analysis of IPSec VPN architecture and proper design methodologies. Peer relationships and fault tolerance models and architectures are examined in detail. Part three addresses enabling VPN services, such as performance, scalability, packet processing, QoS, multicast, and security. This title also gives exposure to integration of IPSec VPNs with other Layer 3 (MPLS VPN) and Layer 2 (Frame Relay, ATM) technologies. Management, provisioning, and troubleshooting techniques are also be discussed. Case studies highlight design, implementation, and management advice to be applied in both service provider and enterprise environments.

About the Author

Vijay Bollapragada, CCIE (R) No. 1606, is a senior manager in the Network Systems Integration and Test Engineering group at Cisco Systems (R) where he works on the architecture, design, and validation of complex network solutions. Mohamed Khalid, CCIE No. 2435, is a technical leader working with IP VPN solutions at Cisco (R). He works extensively with service providers across the globe and their associated Cisco account teams to determine technical and engineering requirements for various IP VPN architectures. Scott Wainner is a Distinguished Systems Engineer in the U.S. Service Provider Sales Organization at Cisco Systems where he focuses on VPN architecture and solution development. In this capacity, he provides customer guidance on IP VPN architectures and drives internal development initiatives within Cisco Systems.

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