ZyWALL USG 100/200 Series User’s Guide
549
CHAPTER 31
L2TP VPN
31.1 Overview
L2TP VPN lets remote users use the L2TP and IPSec client software included with
their computers’ operating systems to securely connect to the network behind the
ZyWALL. The remote users do not need their own IPSec gateways or VPN client
software.
Figure 404 L2TP VPN Overview
31.1.1 What You Can Do in this Chapter
•Use the L2TP VPN screen (see Section 31.2 on page 551) to configure the
ZyWALL’s L2TP VPN settings.
31.1.2 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 25 on page 471 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 25
on page 471 for details). The IPSec VPN connection must:
• Be enabled.
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