SBG3500-N Series User’s Guide
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CHAPTER 24
L2TP VPN
24.1 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
(defined by the IPSec VPN rule Default_L2TPVPN, refer to Section 22.4.3 on page 285) is
established first and then an L2TP tunnel is built inside it. See Chapter 22 on page 275 for
information on IPSec VPN.
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 SBG3500-N Series. The remote
users do not need their own IPSec gateways or VPN client software.
Figure 155 L2TP VPN Overview
24.1.1 What You Can Do in this Chapter
•Use the L2TP VPN screen to configure the SBG3500-N Series’s L2TP VPN settings (Section 24.2
on page 299).
•Use the Monitor screen to view settings for L2TP clients (Chapter 24 on page 301).
Note: You need to configure the Default_L2TPVPN VPN rule in the VPN > IPSec >
IPSec Setup screen. See Chapter 22 on page 275 for information on IPSec VPN.
24.2 L2TP VPN Screen
Click VPN > L2TP VPN to open the Setup screen. Use this screen to configure the SBG3500-N
Series’s L2TP VPN settings.
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