ZyXEL NBG-460N User Guide - Page 185
IPSec VPN
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CHAPTER 15 IPSec VPN 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 117 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 (Section 15.4 on page 188) to display and manage the NBG-460N's VPN rules (tunnels). NBG-460N User's Guide 185