Cisco Systems C819GUK9, C819HG4GVK9 Cisco Easy VPN, 13-2, 1 Remote Access VPN Using IPSec Tunnel

Chapter 13 Configuring a VPN Using Easy VPN and an IPSec Tunnel

Cisco Easy VPN

Figure 13-1 Remote Access VPN Using IPSec Tunnel

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Internet

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1	Remote, networked users
2	VPN client—Cisco 819 ISRs
3	Router—Providing the corporate office network access
4	VPN server—Easy VPN server
5	Corporate office with a network address of 10.1.1.1
6	IPSec tunnel

Cisco Easy VPN

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, WINS server addresses, and split-tunneling flags, to be defined at a VPN server that is acting as an IPSec server.

An 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. Easy VPN server-enabled devices allow remote routers to act as 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 to access network resources on the client site.

After the IPSec server has been configured, a VPN connection can be created with minimal configuration on an IPSec client, such as a supported Cisco 819 ISR. When the IPSec client initiates the VPN tunnel connection, the IPSec server pushes the IPSec policies to the IPSec client and creates the corresponding VPN tunnel connection.

	Cisco 819 Integrated Services Routers Software Configuration Guide
13-2	OL-23590-02