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ZyWALL 110/310/1100 Series User’s Guide 345
CHAPTER 24
L2TP VPN
24.1 Overview
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 ZyWALL. The remote
users do not need their own IPSec gateways or third-party VPN client software.
Figure 226 L2TP VPN Overview
24.1.1 What You Can Do in this Chapter
•Use the L2TP VPN screen (see Section 24.2 on page 347) to configure the ZyWALL’s L2TP VPN
settings.
24.1.2 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 281 for
information on IPSec VPN.
IPSec Configuration Required for L2TP VPN
You must configure an IPSec VPN connection for L2TP VPN to use (see Chapter 20 on page 281 for
details). The IPSec VPN connection must:
• Be enabled.
• Use transport mode.
• Not be a manual key VPN connection.
•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.