Ipsec Vpn; Chapter 15 Ipsec Vpn; Ipsec Vpn Overview; What You Can Do In The Ipsec Vpn Screens - ZyXEL Communications X550N - V3.60 User Manual

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15.1 IPSec VPN 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 102 IPSec VPN: Overview

The VPN tunnel connects the X550N (X) and the remote IPSec router (Y). These routers then
connect the local network (A) and remote network (B).

15.1.1 What You Can Do in the IPSec VPN Screens

Use the General Screen
rules (tunnels).
Use the SA Monitor Screen
connections.
X550N Series User's Guide
(Section 15.2 on page 167) to display and manage the X550N's VPN
(Section 15.3 on page
15

IPSec VPN

183) to display and manage active VPN
165