In this chapter, you learn about the following topics:
Criteria to Evaluate VPNs for Broadband Access
Operation and Configuration of Tunnel-Based VPN Solutions, Using Three Case Studies:
— Site VPN Using GRE Tunnels
— Telecommuter VPN Using IPSec Tunnels
— Infrastructure VPN Using L2TP Tunnels to Provide an Open Access Solution
Two Limited Solutions for Open Access Without Tunnels Using NAT and Policy-Based Routing
This chapter is really about tunnels. A lot of networks do not run MPLS, which creates a need to deliver VPN services over IP cores. These VPNs are typically built using point-to-point tunnels either between CPE routers or between provider routers.
Before taking a closer look at the world of tunnels, the ...