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Prestige 128+ ISDN Router
10-2 L2TP
10.2 Advantages of L2TP:
♦ Users can take advantage of the low cost of the Internet. Instead of making a
long-distance call to connect directly with the corporate site’s remote access
server, remote users dial in to a local ISP and use the Internet to handle all
long-distance connections.
♦ The protocol provides virtual dial-up because the user doesn’t really dial in
to the corporate network, but when the connection is complete, it’s as if he
does. This enables outsourcing of dial-up services to the ISP to support
remote users.
♦ Because PPP framing is used, remote users can access corporate sites using a
variety of protocols such as IP, IPX and so on.
♦ The corporate site assigns an IP address to a remote client instead of the ISP,
allowing it to control the assignment of IP addresses.
♦ L2TP provides end-system transparency, meaning that the remote user does
not require any special software to use the service in a secure way.
♦ An organization can control the authentication of users instead of the ISP.
10.3 How L2TP Works
Figure 10-1 How L2TP works
- Prestige 128 1
- User's Guide 1
- ZyXEL Limited Warranty 4
- Table of Contents 7
- List of Figures 13
- List of Tables 17
- Preface 21
- Preface xxiii 23
- Preface xxv 25
- Chapter 1 27
- Getting to Know Your Router 27
- 1.3.1 Internet Access 31
- 1.3.3 Remote Access Server 32
- Chapter 2 35
- Table 2-1 LED functions 36
- 2.4 Power On Your Prestige 40
- Table 2-2 Main Menu Commands 41
- support to route/bridge 43
- Password 45
- Step 3 46
- 2.7 General Setup 47
- 2.8.1 Switch Type 49
- 2.8.2 MSN and Subaddress 49
- 2.8.3 Incoming Call Routing 49
- 2.8.4 Global Calls 50
- 2.8.7 Advanced Setup 52
- How to use call waiting 52
- 2.9 Ethernet Setup 53
- Chapter 3 55
- Internet Access 55
- 3.2 TCP/IP Parameters 56
- 3.2.2 RIP Setup 57
- 3.2.3 DHCP Configuration 57
- 3-4 Internet Access 58
- Internet Access 3-5 59
- 3-6 Internet Access 60
- Internet Access 3-7 61
- 3-8 Internet Access 62
- Internet Access 3-9 63
- 3-10 Internet Access 64
- Internet Access 3-11 65
- INTERNET 66
- Internet Access 3-13 67
- 3.5.1 Advantages of SUA 68
- 3.6.2 To Switch ISP 71
- Chapter 4 73
- Remote Node Configuration 73
- 4.1.2 Nailed-up Connection 78
- 4.1.4 PPP Multilink 79
- 4.1.5 Bandwidth on Demand 79
- Table 4-2 BTR v MTR for BOD 80
- 4.1.6 Editing PPP Options 81
- 4.1.7 Remote Node Filter 84
- Chapter 5 85
- 5.1.1 Remote Node Setup 87
- Node Network Layer Options 89
- 5.1.2 Static Route Setup 90
- Chapter 6 95
- IPX Configuration 95
- 6.1.2 Frame Types 96
- 6.3 IPX Spoofing 98
- 6.4 IPX Ethernet Setup 99
- Branch Office LAN 100
- Prestige 100
- 6.5.1 IPX Remote Node Setup 101
- Prestige 128+ ISDN Router 102
- 6-8 IPX Configuration 102
- IPX Configuration 6-9 103
- Static Route Menu 104
- Chapter 7 105
- Bridging Setup 105
- 7-2 Bridging Setup 106
- Prestige 128+ ISDN Router 107
- Bridging Setup 7-3 107
- 7-4 Bridging Setup 108
- Bridging Setup 7-5 109
- 7-6 Bridging Setup 110
- Chapter 8 111
- Dial-in Server Configuration 111
- Ethernet LAN 112
- Mode m / ISDN TA 112
- Prestige Prestige 113
- 8.3 Default Dial-In Setup 114
- 8.4 Dial-In Users Setup 118
- Figure 8-6 Edit Dial-in User 119
- 8.4.1 CLID Authentication 121
- 8.4.2 Callback 121
- Chapter 9 125
- Advanced Phone Services 125
- 9.3 The Flash Key 126
- 9.4 Call Waiting 126
- 9.5 Three way calling 127
- 9.6 Call Transfer 128
- 9.7 Call Forwarding 129
- 9-6 Advanced Phone Services 130
- Chapter 10 131
- L2TP Support 131
- Figure 10-1 How L2TP works 132
- L2TP 10-3 133
- 10.4 The Prestige and L2TP 134
- Figure 10-2 Prestige as LNS 135
- Figure 10-3 SMT Menu 11.1 136
- Direct mode 137
- 10-8 L2TP 138
- Proxy Mode 139
- 10.4.3 Prestige as LAC 139
- 10-10 L2TP 140
- Chapter 11 141
- Filter Configuration 141
- 11-2 Filter Configuration 142
- Step 2 143
- 11-4 Filter Configuration 144
- (continued) 145
- Len Length 146
- 11.3.1 TCP/IP Filter Rule 147
- 11-8 Filter Configuration 148
- Filter Configuration 11-9 149
- 11-10 Filter Configuration 150
- Length= 0 151
- 11-12 Filter Configuration 152
- 11.4 Novell IPX Filter Rule 153
- 11-14 Filter Configuration 154
- Chapter 12 157
- SNMP Configuration 157
- 12-2 SNMP Configuration 158
- Chapter 13 159
- System Security 159
- Step 4 160
- 13-4 System Security 162
- System Security 13-5 163
- 13.2.3 The Key Field 164
- Chapter 14 167
- 14.2 Telnet Under SUA 168
- 14.3 Telnet Capabilities 168
- Chapter 15 169
- System Maintenance 169
- 15.1 System Status 170
- Maintenance - Status 171
- 15-4 System Maintenance 172
- 15.1.1 System Information 173
- 15.2 Log and Trace 174
- System Maintenance 15-7 175
- 15.2.2 Syslog And Accounting 176
- 15.3 Diagnostic 178
- System Maintenance 15-11 179
- 15-12 System Maintenance 180
- 15.4 Backup Configuration 181
- 15.5 Restore Configuration 181
- 15.6 Software Update 181
- 15.6.1 Boot module commands 182
- System Maintenance 15-15 183
- Figure 15-13 Command mode 184
- System Maintenance 15-17 185
- 15.8.2 Blacklist 186
- System Maintenance 15-19 187
- 15.8.3 Budget Management 188
- 15.8.4 Call History 188
- Figure 15-18 Call History 189
- 15-22 System Maintenance 190
- Chapter 16 191
- Troubleshooting 191
- 16-2 Troubleshooting 192
- Troubleshooting 16-3 193
- 16-4 Troubleshooting 194
- Setup Information Worksheet 195
- A-2 Worksheet 196
- Acronyms and Abbreviations 197
- Index C-1 199
- C-2 Index 200
- Index C-3 201
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