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Configuring and Troubleshooting Bay Dial VPN Services
3-6 303509-A Rev 00
How the TMS Database Works
The TMS database (by default, UNIX ndbm) resides on the tunnel management
server, which resides on the service provider’s network. The main function of this
database is to verify the user name (or domain) information supplied by the NAS.
It also supplies the NAS with the tunnel addressing information (in the Grant
message) that it needs to create a tunnel for a remote user. The Dial VPN
administrator enters the domain information and the tunnel addressing
information into the database as part of the TMS configuration process.
When the TMS receives a lookup request from the NAS, it parses the user name
into the user and domain name and DNIS, and creates a Domain/0 or
Domain/DNIS key. The TMS database uses this key to find a match in the
database with the supplied user name. If the key matches an existing entry, the
TMS checks to make sure that the maximum number of users is less than the
configured maximum. If so, the TMS sends a Grant message indicating that this is
a Dial VPN user. The Grant message contains the tunnel addressing information.
Since ndbm does not have a locking feature, Bay Networks has implemented
application-level locking to prevent users from updating the database while others
are using it. The lock files are created in the UNIX install directory.
Dynamically Allocating IP Addresses
Dial VPN lets you choose between two methods of dynamic IP address allocation:
• Dynamic Host Configuration Protocol (DHCP) requires its own server and
allocates IP addresses for a configurable, renewable period, called a lease.
• IP address pooling uses the Dial VPN RADIUS server and allocates an IP
address from a configured pool for the duration of the user’s dial-in session.
The following sections describe each of these methods.
Note:
The erpcd and tms_dbm utilities use a common library of functions (in
tms_lib.c) to access the database. If you replace the database and provide
access to it through the same library function interface, as required, the same
commands will work. You can replace the default database engine with a
standard UNIX relational database, such as Sybase, Informix, or Oracle, or
with one you have created yourself. For information about how to replace the
default TMS database, contact the Bay Networks Technical Solutions Center.
- Configuring and 1
- Troubleshooting Bay Dial 1
- VPN Services 1
- Trademarks 2
- Restricted Rights Legend 2
- Statement of Conditions 2
- Contents 5
- 303509-A Rev 00 vii 7
- 303509-A Rev 00 ix 9
- 303509-A Rev 00 xi 11
- 303509-A Rev 00 13
- Before You Begin 15
- Text Conventions 15
- Acronyms 17
- How to Get Help 19
- Chapter 1 21
- Tunneling Overview 21
- What Is Tunneling? 22
- Layer 3 Tunneling 24
- Layer 2 Tunneling 24
- 1-6 303509-A Rev 00 26
- Dial VPN Network Components 27
- 1-8 303509-A Rev 00 28
- 1-10 303509-A Rev 00 30
- 1-12 303509-A Rev 00 32
- Where to Go Next 34
- Chapter 2 35
- Dial VPN Layer 2 Tunneling 35
- 2-2 303509-A Rev 00 36
- L2T0003A 36
- 303509-A Rev 00 2-3 37
- L2TP Packet Encapsulation 38
- 2-6 303509-A Rev 00 40
- Security in an L2TP Network 41
- 2-8 303509-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
- 303509-A Rev 00 2-13 47
- 2-14 303509-A Rev 00 48
- Chapter 3 49
- Dial VPN Layer 3 Tunneling 49
- 3-2 303509-A Rev 00 50
- 303509-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 303509-A Rev 00 62
- 3-16 303509-A Rev 00 64
- 3-18 303509-A Rev 00 66
- DVS0007A 66
- Chapter 4 69
- 4-2 303509-A Rev 00 70
- <acp_or_RADIUS> 71
- stats -o 72
- <called_number> 73
- Configuring Active RIP 75
- Chapter 5 77
- Configuring TMS and Security 77
- for erpcd Networks 77
- 5-2 303509-A Rev 00 78
- 303509-A Rev 00 5-3 79
- Tunnel Management Commands 80
- All commands except 81
- Command Arguments 82
- 303509-A Rev 00 5-13 89
- 0013ABC0:001234560000 89
- Chapter 6 91
- 6-2 303509-A Rev 00 92
- 303509-A Rev 00 6-3 93
- DVS0015A 93
- Using RADIUS Accounting 94
- RADIUS server 95
- Messages.” 99
- Chapter 7 101
- 7-2 303509-A Rev 00 102
- <slot_number> 103
- Caution: 104
- Gateway Accounting Messages 105
- Chapter 8 107
- 8-2 303509-A Rev 00 108
- DVS0008A 108
- 303509-A Rev 00 8-3 109
- (continued) 110
- 303509-A Rev 00 8-7 113
- 8-8 303509-A Rev 00 114
- 303509-A Rev 00 8-9 115
- Enabling L2TP 119
- (continued) 123
- Framed-IPX-Network 124
- 303509-A Rev 00 8-19 125
- Creating a Superscope 127
- Chapter 9 129
- Managing a Dial VPN Network 129
- 9-2 303509-A Rev 00 130
- Appendix A 131
- Planning Worksheet 131
- A-2 303509-A Rev 00 132
- For Each Destination Site 133
- For Each Remote Node 134
- Appendix B 135
- Syslog Messages 135
- TMS Syslog Messages 138
- Appendix C 145
- Troubleshooting 145
- Preventing Problems 146
- Preparing to Troubleshoot 147
- Troubleshooting Worksheet 148
- 303509-A Rev 00 C-5 149
- Troubleshooting Routers 150
- Cable Guide 150
- C-8 303509-A Rev 00 152
- 303509-A Rev 00 C-11 155
- C-12 303509-A Rev 00 156
- 303509-A Rev 00 C-13 157
- C-14 303509-A Rev 00 158
- Managing 163
- Remote Access Concentrators 163
- Using Command Line Interfaces 163
- Managing Remote 165
- Access Concentrators Using 165
- Command Line Interfaces 165
- C-22 303509-A Rev 00 166
- DVS0005A 167
- C-24 303509-A Rev 00 168
- Troubleshooting the LAC 169
- Troubleshooting the LNS 170
- C-32 303509-A Rev 00 176
- Glossary 177
- Glossary-6 303509-A Rev 00 182
- Tunnel Management 182
- System (TMS) 182
- Virtual Private 182
- Network (VPN) 182
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