ZyWALL (ZLD) CLI Reference Guide
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CHAPTER 17
L2TP VPN
This chapter explains how to set up and maintain L2TP VPNs in the ZyWALL.
17.1 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 19 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 Chapter 15 on page 99 for information on IPSec)
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).
17.2 IPSec Configuration
You must configure an IPSec VPN connection for L2TP VPN to use (see Chapter 15 on page
99 for details). The IPSec VPN connection must:
• Be enabled.
• Use transport mode.
L2TP Tunnel
IPSec VPN Tunnel
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