Ipsec Vpn; Chapter 15 Ipsec Vpn; Overview; What You Can Do - ZyXEL Communications NBG-4600N User Manual

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H A P T E R

15.1 Overview

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 provides one perspective of a VPN tunnel.
Figure 128 IPSec VPN: Overview
The VPN tunnel connects the NBG-460N (X) and the remote IPSec router (Y).
These routers then connect the local network (A) and remote network (B).

15.2 What You Can Do

• Use the General screen
NBG-460N's VPN rules (tunnels).
NBG-460N User's Guide
(Section 15.4 on page 198) to display and manage the
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IPSec VPN

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