Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Manual de usuario Pagina 24
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Configuring and Troubleshooting Bay Dial VPN Services
1-4 302272-A Rev. 00
Layer 3 Tunneling
In Layer 3 tunneling, the tunnel exists between the Network Access Server
(NAS), which is a Remote Access Concentrator (RAC), and a gateway router.
Both end points of the tunnel are within the ISP network.
Layer 2 Tunneling
In Layer 2 tunneling, the tunnel exists between the Layer 2 Tunneling Protocol
(L2TP) access concentrator (LAC), usually a remote access concentrator on the
ISP network, and the L2TP network server (LNS), a router or extranet access
switch on the customer’s home network. Rather than terminating at the remote
access concentrator, the IP tunnel extends the PPP session to the LNS, which acts
as a virtual remote access concentrator.
Other features of L2TP include using the Internet infrastructure to support
multiple protocols and unregistered IP addresses. Because the dial-in user’s data is
tunneled at Layer 2 and above (in the ISO model), the L2TP protocol is
independent of Layer 3 information. Enterprise customers with unregistered IP
addressing schemes can also use L2TP to reach their home network.
Comparing Layer 3 and Layer 2 Features
Dial VPN supports both Layer 3 and Layer 2 tunneling on the same ISP network.
Both provide secure network access for dial-in users to their home networks.
Table 1-1
briefly compares the most significant features of both Layer 3 and
Layer 2 tunneling.
Note:
In this guide, the term LAC refers to a remote access server with L2TP
capabilities. The term RAS refers to a remote access server without L2TP
capabilities.
Table 1-1. Layer 3 and Layer 2 Dial VPN Feature Implementation
Dial VPN Feature Layer 3 Layer 2
Tunnel management
erpcd
, ACP, or
RADIUS (BSAC)
erpcd
, ACP, or RADIUS
(BSAC)
Protocol Mobile IP L2TP
- Configuring and 1
- Troubleshooting Bay Dial 1
- VPN Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 302272-A Rev. 00 vii 7
- 302272-A Rev. 00 ix 9
- 302272-A Rev. 00 xi 11
- 302272-A Rev. 00 13
- About This Guide 15
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 19
- Chapter 1 21
- Tunneling Overview 21
- What Is Tunneling? 22
- Layer 3 Tunneling 24
- Layer 2 Tunneling 24
- DVS0012A 26
- Dial VPN Network Components 27
- 1-8 302272-A Rev. 00 28
- 1-10 302272-A Rev. 00 30
- 1-12 302272-A Rev. 00 32
- Where to Go Next 34
- Chapter 2 35
- Dial VPN Layer 2 Tunneling 35
- 2-2 302272-A Rev. 00 36
- L2T0003A 36
- 302272-A Rev. 00 2-3 37
- L2TP Packet Encapsulation 38
- 2-6 302272-A Rev. 00 40
- Security in an L2TP Network 41
- 2-8 302272-A Rev. 00 42
- RADIUS User Authentication 43
- RADIUS Accounting 44
- L2TP IP Interface Addresses 44
- Starting an L2TP Session 45
- Examples of L2TP Tunnels 46
- 302272-A Rev. 00 2-13 47
- 2-14 302272-A Rev. 00 48
- Chapter 3 49
- Dial VPN Layer 3 Tunneling 49
- 3-2 302272-A Rev. 00 50
- DVS0001A 50
- 302272-A Rev. 00 3-3 51
- How Tunnel Management Works 52
- How the TMS Database Works 54
- How DHCP Works 55
- shows the entire process 56
- Assigning Addresses 58
- Starting the Connection 60
- 3-14 302272-A Rev. 00 62
- 3-16 302272-A Rev. 00 64
- 3-18 302272-A Rev. 00 66
- DVS0007A 66
- Chapter 4 69
- 4-2 302272-A Rev. 00 70
- <acp or RADIUS> 71
- 4-4 302272-A Rev. 00 72
- 302272-A Rev. 00 4-5 73
- 4-6 302272-A Rev. 00 74
- Configuring Active RIP 75
- Chapter 5 77
- Tunnel Management Commands 80
- Command Arguments 81
- 5-12 302272-A Rev. 00 88
- 0013ABC0:001234560000 88
- Chapter 6 89
- 6-2 302272-A Rev. 00 90
- 302272-A Rev. 00 6-3 91
- DVS0015A 91
- Using RADIUS Accounting 92
- RADIUS server 93
- Chapter 7 99
- 7-2 302272-A Rev. 00 100
- 302272-A Rev. 00 7-3 101
- 7-4 302272-A Rev. 00 102
- Gateway Accounting Messages 103
- Chapter 8 105
- DVS0008A 106
- 8-2 302272-A Rev. 00 106
- 302272-A Rev. 00 8-3 107
- (continued) 108
- 302272-A Rev. 00 8-7 111
- 8-8 302272-A Rev. 00 112
- 302272-A Rev. 00 8-9 113
- Enabling L2TP 117
- Configuration is completed 118
- (continued) 121
- 8-18 302272-A Rev. 00 122
- field, which by 123
- Creating a Superscope 125
- Chapter 9 127
- Managing a Dial VPN Network 127
- 9-2 302272-A Rev. 00 128
- Appendix A 129
- Planning Worksheet 129
- A-2 302272-A Rev. 00 130
- For Each Destination Site 131
- For Each Remote Node 132
- Appendix B 133
- Syslog Messages 133
- TMS Syslog Messages 136
- Appendix C 143
- Troubleshooting 143
- Preventing Problems 144
- Preparing to Troubleshoot 145
- Troubleshooting Worksheet 146
- 302272-A Rev. 00 C-5 147
- Troubleshooting and Testing 148
- Cable Guide 148
- C-8 302272-A Rev. 00 150
- Caution: Avoid using the 151
- Caution: 152
- 302272-A Rev. 00 C-11 153
- C-12 302272-A Rev. 00 154
- 302272-A Rev. 00 C-13 155
- C-14 302272-A Rev. 00 156
- Managing 161
- Remote Access Concentrators 161
- Using Command Line Interfaces 161
- Managing Remote 163
- Access Concentrators Using 163
- Command Line Interfaces 163
- C-22 302272-A Rev. 00 164
- DVS0005A 165
- C-24 302272-A Rev. 00 166
- Troubleshooting the LAC 167
- Troubleshooting the LNS 168
- C-32 302272-A Rev. 00 174
- Glossary 175
- Glossary-6 302272-A Rev. 00 180
- Tunnel Management 180
- System (TMS) 180
- Virtual Private 180
- Network (VPN) 180
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