ZyXEL ZyWALL ATP700 User Guide - Page 421
L2TP VPN
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Chapter 19 IPSec VPN L2TP VPN L2TP VPN uses the L2TP and IPSec client software included in remote users' Android, iOS, or Windows operating systems for secure connections to the network behind the Zyxel Device. The remote users do not need their own IPSec gateways or third-party VPN client software. For example, configure sales representatives' laptops, tablets, or smartphones to securely connect to the Zyxel Device's network. See Chapter 21 on page 461 for more on L2TP over IPSec. Figure 304 L2TP VPN 19.1.1 What You Can Do in this Chapter • Use the VPN Connection screens (see Section 19.2 on page 424) to specify which IPSec VPN gateway an IPSec VPN connection policy uses, which devices behind the IPSec routers can use the VPN tunnel, and the IPSec SA settings (phase 2 settings). You can also activate or deactivate and connect or disconnect each VPN connection (each IPSec SA). • Use the VPN Gateway screens (see Section 19.2.1 on page 426) to manage the Zyxel Device's VPN 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. • Use the VPN Concentrator screens (see Section 19.4 on page 441) to combine several IPSec VPN connections into a single secure network. • Use the Configuration Provisioning screen (see Section 19.5 on page 443) to set who can retrieve VPN rule settings from the Zyxel Device using the Zyxel Device IPSec VPN Client. 19.1.2 What You Need to Know An IPSec VPN tunnel is usually established in two phases. Each phase establishes a security association (SA), a contract indicating what security parameters the Zyxel Device and the remote IPSec router will use. The first phase establishes an Internet Key Exchange (IKE) SA between the Zyxel Device and remote IPSec router. The second phase uses the IKE SA to securely establish an IPSec SA through which the Zyxel Device and remote IPSec router can send data between computers on the local network and remote network. This is illustrated in the following figure. ZyWALL ATP Series User's Guide 421
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