ZyXEL Communications ZyWall ATP series - CHAPTER 22 L2 TP VPN; 22.1 Overview

ZyWALL ATP Series User’s Guide
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CHAPTER 22
L2TP VPN
22.1 Overview
L2TP VPN uses the L2TP and IPSec client software included in remote users’ Android, iOS, Windows or
Mac OS X 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.
Figure 289 L2TP VPN Overview
22.1.1 What You Can Do in this Chapter
• Use the L2TP VPN screen (see Section 22.2 on page 422) to configure the Zyxel Device’s L2TP VPN
settings.
• Use the VPN Setup Wizard screen in Quick Setup (Chapter 4 on page 70) to configure the Zyxel
Device’s L2TP VPN settings.
22.1.2 What You Need to Know
The Layer 2 Tunneling Protocol (L2TP) works at layer 2 (the data link layer) to tunnel network traffic
between two peers over another network (like the Internet). In L2TP VPN, an IPSec VPN tunnel is
established first and then an L2TP tunnel is built inside it. See Chapter 20 on page 379 for information on
IPSec VPN.
IPSec Configuration Required for L2TP VPN
You must configure an IPSec VPN connection prior to proper L2TP VPN usage (see Chapter 22 on page
421 for details). The IPSec VPN connection must:
• Be enabled.
• Use transport mode.
• Use Pre-Shared Key authentication.