ZyXEL ZyWALL 5 User Guide - Page 358
What You Need to Know About IPSec VPN
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Chapter 19 IPSec VPN • Use the VPN Global Setting screen (see Section 19.10 on page 379) to change settings that apply to all of your VPN tunnels. 19.1.2 What You Need to Know About IPSec VPN An IPSec VPN tunnel is usually established in two phases. Each phase establishes a security association (SA), a contract indicating what security parameters the ZyWALL and the remote IPSec router will use. The first phase establishes an Internet Key Exchange (IKE) SA between the ZyWALL and remote IPSec router. The second phase uses the IKE SA to securely establish an IPSec SA through which the ZyWALL and remote IPSec router can send data between computers on the local network and remote network. This is illustrated in the following figure. Figure 206 VPN: IKE SA and IPSec SA In this example, a computer in network A is exchanging data with a computer in network B. Inside networks A and B, the data is transmitted the same way data is normally transmitted in the networks. Between routers X and Y, the data is protected by tunneling, encryption, authentication, and other security features of the IPSec SA. The IPSec SA is established securely using the IKE SA that routers X and Y established first. Gateway and Network Policies A VPN (Virtual Private Network) tunnel gives you a secure connection to another computer or network. • A gateway policy contains the IKE SA settings. It identifies the IPSec routers at either end of a VPN tunnel. The IKE SA provides a secure connection between the ZyWALL and remote IPSec router. • A network policy contains the IPSec SA settings. It specifies which devices (behind the IPSec routers) can use the VPN tunnel. 358 ZyWALL 5/35/70 Series User's Guide
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