P-2812HNU-51c User’s Guide
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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
12.1.1 What 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).
VPN Tunnel
X
Y
