H3C Technologies H3C SecPath F1000-E - Manual (Page 34)

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L2TP Configuration
This chapter includes these sections:
• L2TP Overview
• L2TP Configuration Task List
• Displaying and Maintaining L2TP
• L2TP Configuration Examples
• Troubleshooting L2TP
L2TP Overview
This section covers these topics:
• Introduction
• Basic Concepts of L2TP
• L2TP Tunneling Modes and Tunnel Establishment Process
• L2TP Features
• Protocols and Standards
Introduction
A virtual private dial-up network (VPDN) is a virtual private network (VPN) that utilizes the dial-up function
of public networks such as ISDN or PSTN networks to provide access services for enterprises, small
Internet service providers (ISPs), and telecommuters. VPDN provides an economical and effective
point-to-point method for remote users to connect to their home LANs.
VPDN technology uses a tunneling protocol to build secure VPNs for enterprises across public networks.
Branch offices and traveling staff can remotely access the headquarters’ Intranet resources through a
virtual tunnel over public networks. Other users on the public networks are not permitted access.
There are primarily three VPDN tunneling protocols:
• PPTP: Point-to-Point Tunneling Protocol
• L2F: Layer 2 Forwarding
• L2TP: Layer 2 Tunneling Protocol
L2TP is currently the most widely-used VPDN tunneling protocol.
Typical L2TP Networking Application
Figure 1 shows a typical VPDN built by using L2TP.