VSG1435-B101 Series User’s Guide
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CHAPTER 21
IPSec
21.1 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 114 VPN: Example
21.1.1 What You Can Do in this Chapter
•Use the Status screen to display and manage the current active VPN
connections (Section 21.2 on page 251).
•Use the Settings screen to view the configured IPSec policies and add, edit or
remove a policy (Section 21.3 on page 252).
VPN Tunnel
X
Y
