Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Uživatelský manuál Strana 64
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Configuring and Troubleshooting Bay Dial VPN Services
3-16 303509-A Rev 00
How a Packet Moves Through a Dial VPN Network
A data packet moves from a remote node to the Dial VPN service provider’s
network through a tunnel created for the remote node to a gateway, which sends
the data to the remote user’s home network through a frame relay connection.
Here are the steps involved in this process.
1.
The remote node sends a PPP packet to the NAS to establish a
connection.
The PPP packet contains flag fields to indicate the beginning and end of a
frame, an address field to indicate the device that originated the frame, a
control field to indicate the type of frame (information or administrative), a
protocol field that indicates the operative network layer protocol, the data, and
the frame check sequence that shows the sequence order of the frame. See the
manual Configuring PPP Services for more information about the PPP
packet.
2.
The NAS strips off the PPP protocol-specific fields and encapsulates the
data into a GRE packet. The GRE packet moves through the IP tunnel to
the gateway.
The GRE packet contains checksum information and flag bits to indicate that
a routing and a key field are present; a control field to indicate the type of
frame; a tunnel flag to indicate that there is a tunnel ID present; a version field
to indicate the version of IP (or IPX) running on the Internet; the protocol type
used (IP or IPX); the tunnel identifier; and the original data from the data
packet. Refer to IETF RFC 1701 or RFC 1490 for more information about the
GRE packet.
3.
The gateway decapsulates the GRE packet information and puts the data
into a frame relay or PPP packet.
The frame relay or PPP packet follows the structural conventions for a packet
of that type. For more information about the frame relay or PPP packet
structure, see Configuring Frame Relay Services, Configuring Dial Services,
or Configuring PPP Services.
4.
The gateway sends the frame relay or PPP packet to the CPE router on
the home network.
Note:
The checksum, control, tunnel flag, and version fields should be 0.
- 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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