ZyXEL Communications 100 Series, 200 Series L2TP VPN, 25.1 Overview, 25.1.2What You Need to Know About L2TP VPN, 25.1.1What You Can Do in the L2TP VPN Screens

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L2TP VPN

25.1 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 295 L2TP VPN Overview

IPSec VPN Tunnel

L2TP Tunnel

25.1.1What You Can Do in the L2TP VPN Screens

•Use the L2TP VPN screen (see Section 25.2 on page 411) to configure the ZyWALL’s L2TP VPN settings.

•Use the L2TP VPN screen (see Section 25.3 on page 412) to display and manage the ZyWALL’s connected L2TP VPN sessions.

25.1.2What You Need to Know About L2TP VPN

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 351 for information on IPSec VPN.

"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).

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ZyWALL USG 100/200 Series User’s Guide