Deploying Site-to-Site IPsec VPNs

IPsec provides security services to IP, and it has become an extremely popular way to provision site-to-site and remote access VPNs. In a site-to-site VPN, IPsec tunnels are built between an organization's sites, and all traffic is authenticated and/or encrypted as it passes over the intervening network.

Depending on connectivity requirements and other considerations, site-to-site IPsec VPNs can be deployed in full-mesh, partial-mesh, or hub-and-spoke architectures, as shown in Figure 6-1.

Figure 6-1. Full-Mesh, Partial-Mesh, and Hub-and-Spoke IPsec VPN Architectures

As illustrated in Figure 6-1, in a hub-and-spoke architecture, spoke (remote) sites are connected to a hub (central) site via IPsec tunnels. Spoke-to-spoke connectivity is provided via the hub site. In a partial-mesh architecture, not all remote sites have direct connectivity to the central site. Finally, in a full-mesh architecture, all sites have direct connectivity to each other.

When designing and deploying IPsec VPNs, it is essential to have a solid grasp of the underlying technology and configuration. This chapter introduces IPsec and discusses site-to-site VPN configuration.


Part I: Understanding VPN Technology

What Is a Virtual Private Network?

Part II: Site-to-Site VPNs

Designing and Deploying L2TPv3-Based Layer 2 VPNs

Designing and Implementing AToM-Based Layer 2 VPNs

Designing MPLS Layer 3 Site-to-Site VPNs

Advanced MPLS Layer 3 VPN Deployment Considerations

Deploying Site-to-Site IPsec VPNs

Scaling and Optimizing IPsec VPNs

Part III: Remote Access VPNs

Designing and Implementing L2TPv2 and L2TPv3 Remote Access VPNs

Designing and Deploying IPsec Remote Access and Teleworker VPNs

Designing and Building SSL Remote Access VPNs (WebVPN)

Part IV: Appendixes

Designing and Building SSL Remote Access VPNs (WebVPN)

Appendix B. Answers to Review Questions

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Comparing, Designing, and Deploying VPHs
Comparing, Designing, and Deploying VPNs
ISBN: 1587051796
EAN: 2147483647
Year: 2007
Pages: 124
Authors: Mark Lewis
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