Ipsec Vpn; Ipsec Vpn Overview; What You Can Do In This Chapter - ZyXEL Communications ISG50-ISDN User Manual

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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 246 IPSec VPN Example

The VPN tunnel connects the ISG50 and the remote (peer) IPSec router (X). These routers then

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

Note: You can use a subscription to increase the number of supported IPSec VPN tunnels.

Chapter 11 on page

• Use the VPN Connection screens (see

a VPN connection policy uses and which devices (behind the IPSec routers) can use the VPN

tunnel and the IPSec SA settings (phase 2 settings). You can also activate / deactivate and

connect / disconnect each VPN connection (each IPSec SA).

• Use the VPN Gateway screens (see

gateways. A VPN gateway specifies the IPSec routers at either end of a VPN tunnel and the IKE

SA settings (phase 1 settings). You can also activate and deactivate each VPN gateway.

ISG50 User's Guide

Section 24.2 on page

Section 24.2.1 on page

IPSec VPN

370) to specify which VPN gateway

371) to manage the ISG50's VPN