ZyWALL/USG Series User’s Guide
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CHAPTER 33
L2TP VPN
33.1 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 ZyWALL/USG. The
remote users do not need their own IPSec gateways or third-party VPN client software.
Figure 427 L2TP VPN Overview
33.1.1 What You Can Do in this Chapter
•Use the L2TP VPN screen (see Section 33.2 on page 599) to configure the ZyWALL/USG’s L2TP
VPN settings.
•Use the VPN Setup Wizard screen in Quick Setup (Chapter 5 on page 129) to configure the
ZyWALL/USG’s L2TP VPN settings.
33.1.2 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 29 on page 534 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 33 on
page 598 for details). The IPSec VPN connection must:
• Be enabled.
• Use transport mode.
•Use Pre-Shared Key authentication.
• Use a VPN gateway with the Secure Gateway set to 0.0.0.0 if you need to allow L2TP VPN
clients to connect from more than one IP address.
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