Concentrator Remote Access Connections with IPsec

The last chapter introduced the VPN 3000 concentrators, including a basic overview of their CLI and GUI interfaces. This chapter will focus solely on using a concentrator to terminate remote access sessions. Cisco concentrators support these remote access VPN implementations:

• IPsec
• PPTP
• L2TP over IPsec
• WebVPN

The remainder of this chapter will focus on the configuration of the concentrator to support IPsec remote access VPN implementations, including basic monitoring of connections and controlling remote access connectivity to the concentrator through groups, users, and network access control (NAC). Chapter 8 will discuss the latter VPN implementations on the VPN 3000 concentrators. I'll discuss detailed troubleshooting of VPN connections in Chapter 11, "Verifying and Troubleshooting Concentrator Connections," and the setup of the remote access clients in Part III, "Clients."