Chapter 5. Designing for High Availability

IPSec is a Layer 3 virtual private network (VPN) technology, offering a wide array of options to execute when designing for High Availability (HA). In this chapter, we will review some of the concepts that impact the availability of an IPSec VPN and introduce specific components of IPSec that present the opportunity to design HA in to the architecture. This chapter provides an introduction to five major areas for designing HA into an IPSec VPN system architecture:

image Network and Path Redundancy—IPSec VPNs require connectivity between two IP interfaces for tunnel termination. Redundancy can be built into ...

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