Summary
This chapter introduced you to the mechanics of VPDNs and some of the L2 protocols that make its operation possible, including L2TP, L2F, and PPTP. With the help of these protocols, a remote client can securely communicate with a private corporate network via a virtual tunnel over a public network. The case studies taught you how to create a working VPDN environment by configuring several Cisco devices, including the following:
Routers as a client
LAC/NAS
LNS/home gateway
PIX Firewall as a PPTP network server
Cisco ACS with a VPDN-related configuration
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