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Cisco 819 Series Integrated Services Routers Software Configuration Guide
OL-23590-02
Chapter 9 Configuring Security Features
Configuring VPN
Remote Access VPN
The configuration of a remote access VPN uses Cisco Easy VPN and an IP Security (IPSec) tunnel to
configure and secure the connection between the remote client and the corporate network.
Figure 9-1
shows a typical deployment scenario.
Figure 9-1 Remote Access VPN Using IPSec Tunnel
The Cisco Easy VPN client feature eliminates much of the tedious configuration work by implementing
the Cisco
Unity Client protocol. This protocol allows most VPN parameters, such as internal IP
addresses, internal subnet masks, DHCP server addresses, Windows Internet Naming Service (WINS)
server addresses, and split-tunneling flags, to be defined at a VPN server, such as a Cisco VPN 3000
concentrator that is acting as an IPSec server.
A Cisco Easy VPN server–enabled device can terminate VPN tunnels initiated by mobile and remote
workers who are running Cisco Easy VPN Remote software on PCs. Cisco
Easy VPN server-enabled
devices allow remote routers to act as Cisco
Easy VPN Remote nodes.
The Cisco Easy VPN client feature can be configured in one of two modes—client mode or network
extension mode. Client mode is the default configuration and allows only devices at the client site to
access resources at the central site. Resources at the client site are unavailable to the central site.
Network extension mode allows users at the central site (where the VPN 3000 series concentrator is
located) to access network resources on the client site.
1 Remote networked users
2 VPN client—Cisco 819 access router
3 Router—Providing the corporate office network access
4 VPN server—Easy VPN server; for example, a Cisco VPN 3000 concentrator with outside
interface address 210.110.101.1
5 Corporate office with a network address of 10.1.1.1
6 IPSec tunnel
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