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3Com Router 3000 Ethernet Family
Configuration Guide
2.3.13 Disconnecting an L2TP Connection.................................................................... 2-22
2.3.14 Enabling/Disabling Flow Control Function of Tunnel .......................................... 2-23
2.4 Displaying and Debugging L2TP ..................................................................................... 2-23
2.5 L2TP Configuration Example........................................................................................... 2-24
2.5.1 NAS-Initialized VPN .............................................................................................. 2-24
2.5.2 Client-Initialized VPN ............................................................................................ 2-26
2.5.3 Interconnecting Single User with Headquarters via Router .................................. 2-27
2.5.4 L2TP Multi-Instance Networking Application ........................................................ 2-29
2.5.5 Using LAC as L2TP Client .................................................................................... 2-33
2.5.6 Complex Network Design...................................................................................... 2-35
2.6 L2TP Troubleshooting ..................................................................................................... 2-35
Chapter 3 Configuration of GRE .................................................................................................. 3-1
3.1 Brief Introduction to GRE................................................................................................... 3-1
3.2 GRE Configuration............................................................................................................. 3-4
3.2.1 Creating Virtual Tunnel Interface ............................................................................ 3-4
3.2.2 Setting Encapsulation Mode ................................................................................... 3-5
3.2.3 Specifying Tunnel Source ....................................................................................... 3-5
3.2.4 Specifying Tunnel Destination................................................................................. 3-6
3.2.5 Assigning Network Address to Tunnel Interface ..................................................... 3-6
3.2.6 Configuring End-to-End Verification on Both Ends of Tunnel................................. 3-7
3.2.7 Setting Identification Key of Tunnel Interface ......................................................... 3-7
3.2.8 Configuring Routing via Tunnel............................................................................... 3-8
3.2.9 Configuring the keepalive function .......................................................................... 3-8
3.3 Displaying and Debugging GRE ........................................................................................ 3-9
3.4 Typical Configuration Examples of GRE ........................................................................... 3-9
3.5 GRE Troubleshooting ...................................................................................................... 3-11
Chapter 4 DVPN ............................................................................................................................. 4-1
4.1 DVPN Overview ................................................................................................................. 4-1
4.1.1 Introduction to DVPN .............................................................................................. 4-1
4.1.2 Basic DVPN Concepts ............................................................................................ 4-1
4.1.3 Operation of DVPN ................................................................................................. 4-3
4.1.4 Basic Network Structure.......................................................................................... 4-5
4.1.5 Traditional VPN versus DVPN ................................................................................ 4-5
4.1.6 Extended DVPN Function ....................................................................................... 4-8
4.2 DVPN Configuration .......................................................................................................... 4-9
4.2.1 Configuring a DVPN Server (Basic Configuration) ............................................... 4-10
4.2.2 Configuring a Client (Basic Configuration)............................................................ 4-12
4.2.3 Configuring the Tunnel Interface........................................................................... 4-14
4.2.4 Configuring a DVPN Class.................................................................................... 4-17
4.2.5 Configuring a DVPN Policy ................................................................................... 4-20
4.2.6 Displaying and Debugging DVPN ......................................................................... 4-24
4.3 Configuration Example .................................................................................................... 4-24
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Troubleshooting
