ZyXEL Communications P-2812HNU-51c IPSec VPN, 12.1 Overview, 12.1.1What You Can Do in this Chapter

12

IPSec VPN

12.1 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 is an example of an IPSec VPN tunnel.

Figure 127 VPN: Example

VPN Tunnel

XY

12.1.1What You Can Do in this Chapter

•The IPSec VPN screen lets you view the configured VPN policies and add, edit or remove a VPN policy (Section 12.3 on page 255).

•The Status screen lets you display and manage the current active VPN connections (Section 12.4 on page 266).

	253
P-2812HNU-51c User’s Guide