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Prestige 324 Intelligent Broadband Sharing Gateway
32 Triangle Route
Appendix J
Triangle Route
The Ideal Setup
When the firewall is on, your Prestige acts as a secure gateway between your LAN and the Internet. In an
ideal network topology, all incoming and outgoing network traffic passes through the Prestige to protect
your LAN against attacks.
Diagram 10 Ideal Setup
The “Triangle Route” Problem
A traffic route is a path for sending or receiving data packets between two Ethernet devices. Some
companies have more than one alternate route to one or more ISPs. If the LAN and ISP(s) are in the same
subnet, the “triangle route” problem may occur. The steps below describe the “triangle route” problem.
Step 1. A computer on the LAN initiates a connection by sending out a SYN packet to a receiving
server on the WAN.
Step 2. The Prestige reroutes the SYN packet through Gateway B on the LAN to the WAN.
Step 3. The reply from the WAN goes directly to the computer on the LAN without going through the
Prestige.
As a result, the Prestige resets the connection, as the connection has not been acknowledged.
- Prestige 324 1
- Copyright 2
- (FCC) Interference Statement 3
- Caution 4
- ZyXEL Limited Warranty 6
- Customer Support 7
- Table of Contents 8
- List of Figures 13
- List of Diagrams 18
- List of Charts 18
- List of Tables 19
- Preface 23
- Syntax Conventions 24
- Getting Started 26
- Chapter 1 28
- 1.2.2 Firmware Features 29
- Time and Date Setting 31
- Logging and Tracing 31
- Chapter 2 34
- 2.4 Front Panel LEDs 37
- Table 2-2 LED Descriptions 38
- Chapter 3 40
- Change default password 41
- Navigation panel 42
- Chapter 4 44
- Wizard Setup 44
- 4.2 Wizard Setup: Screen 2 45
- 4.2.2 PPTP Encapsulation 46
- FIELD DESCRIPTION 47
- 4.2.3 PPPoE Encapsulation 48
- 4.3 Wizard Setup: Screen 3 50
- 10.0.0.0 - 10.255.255.255 51
- 172.16.0.0 - 172.31.255.255 51
- 4.3.4 WAN MAC Address 52
- DESCRIPTION 53
- 4.4 Basic Setup Complete 55
- Chapter 5 56
- 5.1.2 Entering the Password 57
- 5.2.1 Main Menu 58
- Table 5-2 Main Menu Summary 59
- NO. Menu Title FUNCTION 60
- 5.4 General Setup 62
- 5.4.1 Dynamic DNS 63
- Chapter 6 68
- WAN Setup and Dial Backup 68
- 6.2 Dial Backup 69
- 6.2.3 AT Command Strings 71
- 6.2.4 DTR Signal 71
- 6.2.5 Response Strings 71
- 6.2.7 Editing PPP Options 76
- 6.2.8 Edit Script Options 77
- Chapter 7 80
- LAN Setup 80
- 7.2 TCP/IP and DHCP for LAN 81
- IP Pool Setup 82
- DNS Server Address 82
- 7.2.4 Private IP Addresses 83
- 7.2.5 RIP Setup 84
- 7.2.6 IP Multicast 84
- 7.2.7 IP Alias 85
- as shown next 86
- 7-8 LAN Setup 87
- 7.3.1 IP Alias Setup 88
- 7-10 LAN Setup 89
- Chapter 8 90
- Internet Access 90
- 8-2 Internet Access 91
- 8.1.2 PPTP Encapsulation 92
- 8.1.3 Configure PPTP Client 92
- 8.1.4 PPPoE Encapsulation 93
- 8.2 Internet Test Setup 95
- Chapter 9 98
- Remote Node Setup 98
- 9-2 Remote Node Setup 99
- 9.2.2 PPTP Encapsulation 100
- 9-4 Remote Node Setup 101
- 9.2.3 PPPoE Encapsulation 102
- 9-6 Remote Node Setup 103
- 9-8 Remote Node Setup 105
- 9.4 Remote Node Filter 106
- 9.5 Traffic Redirect 107
- 9-14 Remote Node Setup 111
- Chapter 10 112
- IP Static Route Setup 112
- 10.1 IP Static Route Setup 113
- IP Static Route Setup 10-3 114
- Chapter 11 116
- 11.1.2 What NAT Does 117
- 11.1.3 How NAT Works 117
- 11.1.4 NAT Application 118
- 11.1.5 NAT Mapping Types 119
- 11.2.1 Applying NAT 121
- 11.3 NAT Setup 123
- 11.3.1 Address Mapping Sets 124
- Ordering Your Rules 127
- 11-14 NAT 129
- 11.3.2 Port Forwarding Setup 130
- NAT 11-17 132
- 11.3.3 Trigger Port Setup 133
- NAT 11-19 134
- 11.4 General NAT Examples 135
- 11-28 NAT 143
- Advanced Management 145
- Chapter 12 147
- Firewall 147
- 12.2 SMT Firewall Menu 149
- Firewall 12-5 151
- Table 12-1 Firewall Settings 151
- 12-6 Firewall 152
- 12.4.1 LAN-to-WAN rules 153
- 12.4.2 WAN-to-LAN rules 153
- 12.5 Filter 154
- Firewall 12-9 155
- Table 12-2 Firewall Filter 155
- 12.6 Services 156
- Firewall 12-11 157
- Table 12-3 Firewall Service 157
- Chapter 13 159
- Filter Configuration 159
- Outgoing 160
- Filter Set 161
- Execute Filter 161
- Len Length 164
- 13-8 Filter Configuration 166
- Filter Configuration 13-9 167
- 13-10 Filter Configuration 168
- 13.2.4 Generic Filter Rule 169
- 13-12 Filter Configuration 170
- 13.3 Example Filter 171
- Filter Configuration 13-15 173
- 13.4 Filter Types and NAT 174
- 13.5.1 LAN traffic 175
- 13.5.2 Remote Node Filters 176
- Chapter 14 177
- 14.2 UPnP and ZyXEL 178
- DESCRIPTION 179
- Web Configurator Easy Access 185
- Chapter 15 187
- SNMP Configuration 187
- 15.2 Supported MIBs 188
- 15.3 SNMP Configuration 188
- 15.4 SNMP Traps 189
- Chapter 16 191
- 16.2.1 System Information 194
- 16.2.2 Console Port Speed 195
- 16.3 Log and Trace 196
- 16.3.2 UNIX Syslog 197
- 16.4 Diagnostic 199
- 16.4.1 WAN DHCP 200
- Chapter 17 203
- Maintenance 203
- 17.2 Backup Configuration 204
- FTP GUI Clients 206
- 17.2.3 TFTP Command Example 207
- TFTP GUI Clients 208
- 17.3 Restore Configuration 210
- Save to ROM 213
- 17.4.1 Firmware File Upload 214
- 17.4.3 TFTP File Upload 216
- TFTP Upload Command Example 217
- Chapter 18 221
- 18.2 Call Control Support 222
- 18.2.1 Budget Management 223
- 18.2.2 Call History 224
- 18.3 Time and Date Setting 225
- Time Update Frequency 227
- Remote Management 229
- Chapter 19 229
- 19.2 Remote Management Setup 230
- 19.5 System Timeout 233
- Chapter 20 235
- Call Scheduling 235
- 20.3 Schedule Set Setup 236
- Call Scheduling 20-3 237
- Call Scheduling 20-5 239
- Chapter 21 241
- Troubleshooting 241
- 21-2 Troubleshooting 242
- Appendix A 245
- How PPPoE Works 246
- Appendix B 248
- PPTP Protocol Overview 249
- Call Connection 250
- PPP Data Connection 250
- Appendix C 251
- Boot Commands 251
- 8 Boot Commands 252
- Appendix D 253
- NetBIOS Filter Commands 253
- NetBIOS Filter Configuration 254
- Appendix E 256
- Log Descriptions 256
- Appendix F 260
- Power Adapter Specifications 260
- Appendix G 261
- Hardware Specifications 261
- Appendix H 262
- Properties 264
- Windows 2000/NT/XP 267
- 268
- Macintosh OS 8/9 272
- Macintosh OS X 273
- Appendix I 275
- Protection 275
- Appendix J 276
- Triangle Route 276
- IP Aliasing 277
- Gateways on the WAN Side 278
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