Ipsec Vpn; Ipsec Vpn Overview; What You Can Do In The Ipsec Vpn Screens; Figure 249 Ipsec Vpn Example - ZyXEL Communications 200 Series User Manual

Unified security gateway

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A virtual private network (VPN) provides secure communications between sites without the

expense of leased site-to-site lines. A secure VPN is a combination of tunneling, encryption,

authentication, access control and auditing. It is used to transport traffic over the Internet or

any insecure network that uses TCP/IP for communication.

Internet Protocol Security (IPSec) is a standards-based VPN that offers flexible solutions for

secure data communications across a public network like the Internet. IPSec is built around a

number of standardized cryptographic techniques to provide confidentiality, data integrity and

authentication at the IP layer. The following figure is an example of an IPSec VPN tunnel.

The VPN tunnel connects the ZyWALL (X) and the remote IPSec router (Y). These routers

then connect the local network (A) and remote network (B).

• Use the VPN Connection screens (see

gateway a VPN connection policy uses and which devices (behind the IPSec routers) can

use the VPN tunnel and the IPSec SA settings (phase 2 settings). You can also activate /

deactivate and connect / disconnect each VPN connection (each IPSec SA).

• Use the VPN Gateway screens (see

ZyWALL's VPN gateways. A VPN gateway specifies the IPSec routers at either end of a

VPN tunnel and the IKE SA settings (phase 1 settings). You can also activate and

deactivate each VPN gateway.

ZyWALL USG 100/200 Series User's Guide

IPSec VPN

Section 20.2 on page

353) to specify which VPN

Section 20.2.1 on page

355) to manage the

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