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H A P T E R
This chapter explains how to set up and maintain L2TP VPNs in the ZyWALL.
18.1 L2TP VPN 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 21 L2TP VPN Overview
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 (see
and then an L2TP tunnel is built inside it.
At the time of writing the L2TP remote user must have a public IP address in
order for L2TP VPN to work (the remote user cannot be behind a NAT router
or a firewall).
18.2 IPSec Configuration
You must configure an IPSec VPN connection for L2TP VPN to use (see
137
for details). The IPSec VPN connection must:
• Be enabled.
• Use transport mode.
ZyWALL (ZLD) CLI Reference Guide
L2TP VPN
IPSec VPN Tunnel
L2TP Tunnel
Chapter 16 on page 137
18
for information on IPSec)
Chapter 16 on page
153
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