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Chapter 12 Network Address Translation (NAT)
VSG1432-B101 Series User’s Guide
191
Port Forwarding Example
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in
the example), port 80 to another (B in the example) and assign a default server IP
address of 192.168.1.35 to a third (C in the example). You assign the LAN IP
addresses and the ISP assigns the WAN IP address. The NAT network appears as a
single host on the Internet.
Figure 75 Multiple Servers Behind NAT Example
SNMP trap 162
PPTP (Point-to-Point Tunneling Protocol) 1723
Table 52 Services and Port Numbers
SERVICES PORT NUMBER
D=192.168.1.36
192.168.1.1
IP address assigned by ISP
A=192.168.1.33
B=192.168.1.34
C=192.168.1.35
- VSG1432-B101 Series 1
- About This User's Guide 3
- Customer Support 4
- Disclaimer 4
- Document Conventions 5
- Icons Used in Figures 6
- Safety Warnings 7
- Contents Overview 10
- Table of Contents 11
- Chapter 7 13
- Chapter 8 13
- User’s Guide 21
- CHAPTER 1 23
- 1.4.1 Internet Access 24
- ADSL / VDSL 25
- Ethernet 25
- 1.5 Hardware Setup 26
- 1.6 Hardware Connections 28
- 1.7 LEDs (Lights) 29
- Table 1 LED Descriptions 30
- 1.8 The RESET Button 31
- 1.9 Wireless Access 31
- CHAPTER 2 33
- Figure 7 Password Screen 34
- Figure 8 Welcome Screen 34
- Figure 10 Network Map 35
- 2.2 Web Configurator Layout 36
- 2.2.2 Main Window 37
- 2.2.3 Navigation Panel 37
- LINK TAB FUNCTION 39
- CHAPTER 3 41
- CHAPTER 4 43
- (DNS server1)/192.168.5.1 44
- Chapter 4 Tutorials 45
- SSID Example 46
- Security Mode WPA-PSK 46
- 802.11 Mode 802.11b/g/n Mixed 46
- 4.3.2 Using WPS 48
- Wireless Client 50
- ZyXEL Device 50
- PIN Configuration 51
- 4.3.3 Without WPS 52
- SSID Company VIP Guest 53
- Another Network 58
- 10,000 kbps 61
- Chapter 4 Tutorials 62
- • Rate Limit: 5,000 (kbps) 62
- Technical Reference 67
- CHAPTER 5 69
- the ZyXEL Device to update 70
- 5.3 The Status Screen 71
- Table 5 Status Screen 72
- CHAPTER 6 75
- 6.1.2 Before You Begin 76
- 6.2 The Broadband Screen 77
- 6.2.1 Add/Edit Broadband 78
- 6.2.2 PPPoE Encapsulation 78
- Chapter 6 Broadband 79
- Chapter 6 Broadband 80
- 6.2.2.1 Bridge 83
- 6.3 Technical Reference 86
- 6.3.2 Multiplexing 87
- 6.3.3 VPI and VCI 87
- 6.3.4 IP Address Assignment 87
- 6.3.5 NAT 88
- 6.3.6 Traffic Shaping 88
- 6.3.7 ATM Traffic Classes 89
- 6.3.8 Introduction to VLANs 89
- CHAPTER 7 91
- 7.2 The General Screen 92
- Chapter 7 Wireless 93
- 7.2.1 No Security 95
- 7.2.2 Basic (WEP Encryption) 96
- 7.2.4 WPA(2) Authentication 99
- 7.3 The More AP Screen 101
- 7.3.1 Edit More AP 102
- 7.4 MAC Authentication 103
- 7.5 The WPS Screen 105
- 7.6 The WMM Screen 106
- 7.7 The WDS Screen 107
- LABEL DESCRIPTION 108
- Chapter 7 Wireless 108
- 7.7.1 WDS Scan 109
- 7.8 The Others Screen 110
- 7.9 Technical Reference 111
- Radio Channels 113
- 7.9.3.1 SSID 114
- 7.9.3.4 Encryption 116
- 7.9.4 Signal Problems 117
- 7.9.5 BSS 117
- 7.9.6 MBSSID 118
- 7.9.7 Preamble Type 119
- 7.9.9.2 PIN Configuration 121
- Figure 40 How WPS works 123
- REGISTRARENROLLEE 124
- SECURITY INFO 124
- REGISTRAR 124
- ENROLLEE 124
- EXISTING CONNECTION 124
- CHAPTER 8 127
- 8.1.2 What You Need To Know 128
- 8.1.3 Before You Begin 129
- 8.2 The LAN Setup Screen 130
- Chapter 8 Home Networking 131
- 8.3 The Static DHCP Screen 132
- 8.4 The UPnP Screen 133
- Installing UPnP in Windows Me 134
- Installing UPnP in Windows XP 136
- Networking Services 137
- System Tray Icon 139
- Web Configurator Easy Access 140
- Network Co nnections 141
- 8.7.2 DHCP Setup 143
- 8.7.3 DNS Server Addresses 143
- 8.7.4 LAN TCP/IP 144
- Private IP Addresses 145
- Chapter 8 Home Networking 146
- CHAPTER 9 147
- 9.2 The Routing Screen 148
- Figure 51 Routing: Add/Edit 149
- Table 29 Routing: Add/Edit 149
- Chapter 9 Static Routing 150
- CHAPTER 10 151
- 10.2 What You Need to Know 152
- Traffic Policing 153
- 10.4 The Queue Setup Screen 154
- 10.4.1 Adding a QoS Queue 156
- 10.5.1 Add/Edit QoS Class 159
- 10.7 The QoS Monitor Screen 165
- 10.8 Technical Reference 166
- DiffServ 167
- DSCP and Per-Hop Behavior 167
- IP Precedence 167
- Token Bucket 169
- Two Rate Three Color Marker 170
- CHAPTER 11 171
- Chapter 11 Policy Forwarding 173
- Chapter 11 Policy Forwarding 174
- CHAPTER 12 175
- Global/Local 176
- Port Forwarding 176
- Finding Out More 176
- A=192.168.1.33 177
- D=192.168.1.36 177
- C=192.168.1.3 177
- B=192.168.1.34 177
- 12.3 The Applications Screen 179
- 12.3.1 Add New Application 180
- Table 45 Applications: Add 181
- 12.5 The DMZ Screen 185
- 12.6 The ALG Screen 186
- 12.7 The Sessions Screen 186
- 12.8 Technical Reference 187
- 12.8.2 What NAT Does 188
- 12.8.3 How NAT Works 189
- 12.8.4 NAT Application 190
- Port Forwarding Example 191
- CHAPTER 13 193
- 13.1.2 What You Need To Know 194
- 13.2 The DNS Entry Screen 195
- 13.3 The Dynamic DNS Screen 196
- Chapter 13 Dynamic DNS Setup 197
- Chapter 13 Dynamic DNS Setup 198
- CHAPTER 14 199
- IGMP Proxy 200
- Router Alert Option 201
- 14.2 The IGMP General Screen 202
- Chapter 14 IGMP 203
- 14.3.2 IGMP Service Add 207
- 14.4 IGMP ACL Configuration 209
- 14.4.1 IGMP ACL Add 210
- CHAPTER 15 211
- Internet 212
- Chapter 15 Interface Group 214
- CHAPTER 16 215
- 16.1.2 What You Need to Know 216
- 16.2 The Firewall Screen 217
- 16.3 The Protocol Screen 217
- Chapter 16 Firewall 218
- 16.3.1 Add a Protocol 219
- Chapter 16 Firewall 221
- CHAPTER 17 225
- Chapter 17 MAC Filter 226
- CHAPTER 18 227
- Table 71 Parental Control 228
- Chapter 18 Parental Control 229
- Chapter 18 Parental Control 230
- CHAPTER 19 231
- 19.2.1 Add/Edit a Schedule 232
- CHAPTER 20 233
- Chapter 20 Certificates 236
- 20.3.3 Import Certificate 237
- 20.3.4 Certificate Details 239
- 20.4 The Trusted CA Screen 241
- Table 82 Trusted CA: View 242
- CHAPTER 21 245
- 21.1.2 What You Need to Know 246
- Local Network 248
- Remote Network 248
- VPN Tunnel 248
- 21.3.1.1 Auto(IKE) Key Setup 249
- Chapter 21 IPSec 251
- Chapter 21 IPSec 252
- 21.3.1.2 Manual Key Setup 253
- 21.4 Technical Reference 256
- 21.4.1 IPSec Architecture 257
- 21.4.2 Encapsulation 258
- 21.4.3 IKE Phases 259
- 21.4.4 Negotiation Mode 260
- 21.4.5 IPSec and NAT 260
- Table 89 VPN and NAT 261
- 21.4.7 ID Type and Content 262
- 21.4.8 Pre-Shared Key 263
- CHAPTER 22 265
- Chapter 22 Service Control 266
- CHAPTER 23 267
- 23.2 ARP Table Screen 268
- CHAPTER 24 269
- 24.2 The System Log Screen 270
- 24.3 The Security Log Screen 271
- Chapter 24 Logs 272
- CHAPTER 25 273
- 25.2 The WAN Status Screen 274
- Chapter 25 Traffic Status 275
- 25.3 The LAN Status Screen 276
- Chapter 25 Traffic Status 278
- CHAPTER 26 279
- 26.3 IGMP Statistics Screen 280
- Chapter 26 IGMP Status 281
- Chapter 26 IGMP Status 282
- CHAPTER 27 283
- CHAPTER 28 287
- 28.3 The TR-064 Screen 289
- Chapter 28 Remote Management 290
- CHAPTER 29 291
- Chapter 29 Time Settings 292
- Chapter 29 Time Settings 293
- CHAPTER 30 295
- Chapter 30 Logs Setting 296
- 30.2.1 Example E-mail Log 297
- CHAPTER 31 299
- Figure 142 Error Message 300
- CHAPTER 32 301
- Restore Configuration 302
- Reset to Factory Defaults 303
- 32.3 The Reboot Screen 304
- CHAPTER 33 305
- Chapter 33 Diagnostic 306
- CHAPTER 34 307
- I forgot the password 308
- 34.3 Internet Access 310
- Chapter 34 Troubleshooting 314
- CHAPTER 35 315
- 35.2 Firmware Specifications 316
- STANDARD DESCRIPTION 320
- APPENDIX A 321
- Windows 95/98/Me 322
- Configuring 323
- Verifying Settings 324
- Windows 2000/NT/XP 325
- Windows Vista 329
- Macintosh OS 8/9 336
- Macintosh OS X 338
- Using Configuration Files 341
- APPENDIX B 345
- Subnet Masks 346
- Network Size 347
- Notation 348
- Subnetting 348
- Example: Four Subnets 350
- Example: Eight Subnets 351
- Subnet Planning 352
- Configuring IP Addresses 352
- APPENDIX C 355
- JavaScripts 358
- Java Permissions 360
- JAVA (Sun) 361
- Mozilla Firefox 362
- APPENDIX D 365
- Figure 198 RTS/CTS 368
- Fragmentation Threshold 369
- IEEE 802.11g Wireless LAN 369
- Wireless Security Overview 369
- IEEE 802.1x 370
- Types of EAP Authentication 371
- Dynamic WEP Key Exchange 373
- WPA and WPA2 374
- User Authentication 375
- Security Parameters Summary 377
- Antenna Overview 378
- Antenna Characteristics 378
- Types of Antennas for WLAN 379
- Positioning Antennas 379
- Appendix D Wireless LANs 380
- APPENDIX E 381
- Appendix E Services 382
- Appendix E Services 383
- APPENDIX F 385
- APPENDIX G 397
- ZyXEL Limited Warranty 399
- Registration 400
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