Chapter 18 Ipsec Vpn; Ipsec Vpn Overview; Figure 168 Vpn: Example - ZyXEL Communications ZyWall 5 Series User Manual

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This chapter explains how to set up and maintain IPSec VPNs in the ZyWALL. First, it

provides an overview of IPSec VPNs. Then, it introduces each screen for IPSec VPN in the

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.

The VPN tunnel connects the ZyWALL (X) and the remote IPSec router (Y). These routers

then connect the local network (A) and remote network (B).

Chapter 18 IPSec VPN

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