IP-Based VPN

David E. McDysan, MCI Corporation

Introduction to IP-Based VPNs

Applications of IP VPNs

Drivers for IP-Based VPNs

Introduction to VPN Technologies

Taxonomy of IP-Based VPNs

Customer Edge (CE)-Based VPNS

CE VPNs over Virtual Connection Networks

IPsec-based CE VPNs

Provider Edge (PE)-Based L3 VPNs

Aggregated Routing VPNs

Virtual Router VPNs

Design Considerations and Example VPN Deployment

Considerations in Choosing a VPN Approach

Deployment of a CE-Based VPN in E-Commerce

Glossary

Cross References

References

INTRODUCTION TO IP-BASED VPNs

An IP-based virtual private network (VPN) may provide service at layer 2 or layer 3. The focus of this chapter is on layer 3 VPNs, specifically those using the Internet protocol (IP). RFC 3809 (Nagarajan et al., 2004) covers requirements and aspects that are common to both layer 2 and layer 3 VPNs.

Applications of IP VPNs

The public Internet plays an important role for many enterprises (McDysan, 2000). Users can exchange information with individuals anywhere in the world via e-mail, Web sites, transaction systems, file sharing, and file transfer. Furthermore, the Internet is rapidly growing as a means for commercial enterprises to conduct business and to advertise their goods and services. The Internet can help reduce administrative costs by placing the data entry, verification, and think-time aspects of order entry and service parameter selection in the hands of the end user. This replaces the older, less efficient paradigm of people ...

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