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Chapter 10 Network Address Translation (NAT)
VMG8924-B10A and VMG8924-B30A Series User’s Guide
173
10.10.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical LANs
using IP alias) behind the Device can communicate with three distinct WAN networks.
Figure 96 NAT Application With IP Alias
Port Forwarding: Services and Port Numbers
The most often used port numbers are shown in the following table. Please refer to RFC 1700 for
further information about port numbers. Please also refer to the Supporting CD for more examples
and details on port forwarding and NAT.
Table 69 Services and Port Numbers
SERVICES PORT NUMBER
ECHO 7
FTP (File Transfer Protocol) 21
SMTP (Simple Mail Transfer Protocol) 25
DNS (Domain Name System) 53
Finger 79
HTTP (Hyper Text Transfer protocol or WWW, Web) 80
POP3 (Post Office Protocol) 110
NNTP (Network News Transport Protocol) 119
SNMP (Simple Network Management Protocol) 161
SNMP trap 162
PPTP (Point-to-Point Tunneling Protocol) 1723
- VMG8924-B10A and VMG8924 1
- B30A Series 1
- User’s Guide 1
- IMPORTANT! 2
- READ CAREFULLY BEFORE USE 2
- Related Documentation 2
- Contents Overview 3
- Chapter 10 8
- Chapter 11 8
- Table of Contents 10
- Table of Contents 11
- CHAPTER 1 17
- ADSL / VDSL 18
- File Sharing 20
- Media Server 20
- 1.5 LEDs (Lights) 21
- LED COLOR STATUS DESCRIPTION 22
- 1.6 The RESET Button 23
- 1.7 Wireless Access 23
- CHAPTER 2 27
- 2.2 Web Configurator Layout 29
- 2.2.2 Main Window 30
- 2.2.3 Navigation Panel 31
- LINK TAB FUNCTION 32
- CHAPTER 3 35
- Technical Reference 37
- CHAPTER 4 39
- 4.3 The Status Screen 40
- Table 4 Status Screen 41
- CHAPTER 5 45
- 5.1.2 What You Need to Know 46
- 2001:db8:1a2b:15:0:0:1a2f:0 47
- IPv6 Prefix and Prefix Length 48
- IPv6 Subnet Masking 48
- IPv6 Rapid Deployment 48
- 5.2 The Broadband Screen 49
- Chapter 5 Broadband 50
- 5.2.1.1 Routing Mode 51
- Chapter 5 Broadband 53
- 5.2.1.2 Bridge Mode 56
- Mode) (continued) 58
- 5.3 The 3G Backup Screen 59
- 5.4 The Advanced Screen 63
- 5.5 The 802.1x Screen 64
- 5.6 The WAN Status Screen 65
- 5.7 Technical Reference 66
- PPP over ATM (PPPoA) 67
- PPP over Ethernet (PPPoE) 67
- RFC 1483 67
- Multiplexing 67
- ATM Traffic Classes 68
- IP Address Assignment 69
- Introduction to VLANs 69
- Multicast 70
- DNS Server Address Assignment 70
- IPv6 Addressing 71
- CHAPTER 6 73
- 6.2 The General Screen 74
- Chapter 6 Wireless 76
- 6.2.1 No Security 77
- 6.2.2 Basic (WEP Encryption) 77
- Chapter 6 Wireless 79
- 6.2.4 WPA(2) Authentication 81
- 6.3 The More AP Screen 82
- 6.3.1 Edit More AP 84
- 6.4 MAC Authentication 86
- 6.5 The WPS Screen 87
- 6.6 The WMM Screen 88
- 6.7 The WDS Screen 89
- 6.7.1 WDS Scan 90
- 6.8 The Others Screen 91
- 6.10 Technical Reference 93
- Radio Channels 95
- 6.10.3.1 SSID 96
- 6.10.3.2 MAC Address Filter 96
- 6.10.3.3 User Authentication 97
- 6.10.3.4 Encryption 97
- 6.10.4 Signal Problems 98
- 6.10.5 BSS 98
- 6.10.6 MBSSID 99
- 6.10.7 Preamble Type 99
- 6.10.9.2 PIN Configuration 101
- 6.10.9.3 How WPS Works 102
- CLIENT 1 104
- CLIENT 2 104
- 6.10.9.5 Limitations of WPS 105
- CHAPTER 7 107
- 7.1.2 What You Need To Know 108
- 7.2 The LAN Setup Screen 109
- Chapter 7 Home Networking 111
- LABEL DESCRIPTION 111
- Chapter 7 Home Networking 112
- 7.3 The Static DHCP Screen 113
- 7.4 The UPnP Screen 114
- Installing UPnP in Windows Me 115
- Installing UPnP in Windows XP 117
- Networking Services 118
- System Tray Icon 120
- Network Co nnections 122
- 7.8 The STB Vendor ID Screen 125
- 7.10 The LAN VLAN Screen 126
- 7.11 The Wake on LAN Screen 127
- 7.12 Technical Reference 128
- 7.12.4 LAN TCP/IP 129
- CHAPTER 8 131
- 8.2 The Routing Screen 132
- 8.2.1 Add/Edit Static Route 133
- 8.3 The DNS Route Screen 134
- 8.5 RIP 137
- Chapter 8 Routing 138
- CHAPTER 9 139
- Tagging and Marking 140
- Traffic Shaping 140
- Traffic Policing 140
- 9.4 The Queue Setup Screen 142
- 9.4.1 Adding a QoS Queue 143
- 9.5 The Class Setup Screen 144
- 9.5.1 Add/Edit QoS Class 146
- 9.7 The QoS Monitor Screen 151
- 9.8 Technical Reference 152
- DSCP and Per-Hop Behavior 153
- IP Precedence 153
- Token Bucket 154
- Two Rate Three Color Marker 155
- CHAPTER 10 157
- Port Forwarding 158
- Finding Out More 158
- 192.168.1.1 159
- IP Address assigned by ISP 159
- 10.3 The Applications Screen 161
- 10.3.1 Add New Application 162
- 10.5 The DMZ Screen 166
- 10.6 The ALG Screen 166
- 10.9 The Sessions Screen 170
- 10.10 Technical Reference 170
- 10.10.2 What NAT Does 171
- 10.10.3 How NAT Works 172
- 10.10.4 NAT Application 173
- Port Forwarding Example 174
- CHAPTER 11 175
- 11.2 The DNS Entry Screen 176
- 11.3 The Dynamic DNS Screen 177
- Chapter 11 Dynamic DNS Setup 178
- CHAPTER 12 179
- Internet 180
- Chapter 12 Interface Group 183
- Chapter 12 Interface Group 184
- CHAPTER 13 185
- 13.1.3 Before You Begin 187
- 13.2 The File Sharing Screen 188
- 13.3 The Media Server Screen 190
- 13.4 Printer Server 191
- CHAPTER 14 193
- CHAPTER 15 197
- 15.1.2 What You Need to Know 198
- 15.2 The Firewall Screen 199
- 15.3 The Protocol Screen 199
- 15.3.1 Add/Edit a Service 200
- Chapter 15 Firewall 203
- 15.5 The DoS Screen 204
- CHAPTER 16 205
- Chapter 16 MAC Filter 206
- CHAPTER 17 207
- Chapter 17 Parental Control 209
- Chapter 17 Parental Control 210
- CHAPTER 18 211
- 18.2.1 Add/Edit a Schedule 212
- CHAPTER 19 213
- 19.4 The Trusted CA Screen 216
- Chapter 19 Certificates 220
- CHAPTER 20 221
- Chapter 20 VPN 225
- Chapter 20 VPN 226
- 20.5 Technical Reference 228
- 20.5.2 Encapsulation 229
- 20.5.3 IKE Phases 230
- 20.5.4 Negotiation Mode 231
- 20.5.5 IPSec and NAT 232
- 20.5.7 ID Type and Content 233
- 20.5.8 Pre-Shared Key 234
- CHAPTER 21 235
- 21.2 Before You Begin 236
- 21.3 The SIP Account Screen 236
- Chapter 21 Voice 239
- Chapter 21 Voice 240
- 21.4.2 Dial Plan Rules 248
- 21.5 The Phone Screen 249
- 21.6 The Call Rule Screen 249
- 21.10 Technical Reference 252
- SIP Number 253
- SIP Service Domain 253
- SIP Registration 253
- Authorization Requirements 253
- SIP Servers 253
- SIP User Agent 254
- SIP Proxy Server 254
- SIP Redirect Server 254
- SIP Register Server 255
- Pulse Code Modulation 255
- SIP Call Progression 256
- Voice Coding 258
- Comfort Noise Generation 258
- Echo Cancellation 258
- Custom Tones (IVR) 259
- Recording Custom Tones 259
- Listening to Custom Tones 259
- Deleting Custom Tones 259
- Type of Service (ToS) 260
- DiffServ 260
- 21.10.2.1 The Flash Key 261
- European Call Hold 262
- European Call Waiting 262
- European Call Transfer 262
- European Three-Way Conference 263
- USA Call Hold 263
- USA Call Waiting 263
- USA Call Transfer 264
- USA Three-Way Conference 264
- ACTION FUNCTION DESCRIPTION 265
- CHAPTER 22 267
- 22.2 The System Log Screen 268
- 22.3 The Security Log Screen 269
- Chapter 22 Log 270
- CHAPTER 23 271
- Chapter 23 Traffic Status 272
- 23.3 The LAN Status Screen 273
- 23.4 The NAT Status Screen 274
- CHAPTER 24 275
- Chapter 24 VoIP Status 276
- CHAPTER 25 277
- Chapter 25 ARP Table 278
- CHAPTER 26 279
- Chapter 26 Routing Table 280
- CHAPTER 27 281
- Chapter 27 IGMP/MLD Status 282
- CHAPTER 28 283
- Chapter 28 xDSL Statistics 284
- Chapter 28 xDSL Statistics 285
- CHAPTER 29 287
- Chapter 29 3G Statistics 288
- CHAPTER 30 289
- Chapter 30 User Account 290
- CHAPTER 31 291
- 31.3 The Trust Domain Screen 292
- IPv4 Address 293
- Chapter 31 Remote Management 294
- CHAPTER 32 295
- Chapter 32 TR-069 Client 296
- CHAPTER 33 297
- Chapter 33 TR-064 298
- CHAPTER 34 299
- CHAPTER 35 301
- Chapter 35 Time Settings 302
- Chapter 35 Time Settings 303
- CHAPTER 36 305
- CHAPTER 37 307
- 37.2.1 Example E-mail Log 308
- Chapter 37 Logs Setting 310
- CHAPTER 38 311
- CHAPTER 39 313
- Restore Configuration 314
- 39.3 The Reboot Screen 315
- Chapter 39 Configuration 316
- CHAPTER 40 317
- 40.4 802.1ag 319
- 40.5 OAM Ping 320
- Chapter 40 Diagnostic 322
- CHAPTER 41 323
- 41.2 Device Access and Login 324
- 41.3 Internet Access 326
- 41.5 USB Device Connection 328
- 41.6 UPnP 328
- APPENDIX A 329
- Australia 334
- South Africa 334
- APPENDIX B 335
- Installing Components 336
- Configuring 336
- Verifying Settings 338
- Windows 2000/NT/XP 338
- Windows Vista 343
- Macintosh OS 8/9 350
- Macintosh OS X 351
- Using Configuration Files 355
- APPENDIX C 357
- Subnet Masks 358
- Network Size 359
- Notation 359
- Subnetting 360
- Example: Four Subnets 361
- Example: Eight Subnets 362
- Subnet Planning 363
- Configuring IP Addresses 364
- Private IP Addresses 364
- APPENDIX D 365
- JavaScripts 368
- Java Permissions 370
- JAVA (Sun) 371
- Mozilla Firefox 372
- APPENDIX E 375
- Fragmentation Threshold 378
- IEEE 802.11g Wireless LAN 379
- Wireless Security Overview 379
- IEEE 802.1x 380
- Types of RADIUS Messages 380
- Types of EAP Authentication 381
- PEAP (Protected EAP) 382
- Dynamic WEP Key Exchange 382
- WPA and WPA2 383
- Encryption 383
- User Authentication 384
- Types of Antennas for WLAN 387
- Positioning Antennas 387
- Appendix E Wireless LANs 388
- APPENDIX F 389
- Global Address 390
- Unspecified Address 390
- Loopback Address 390
- Multicast Address 390
- Subnet Masking 391
- Interface ID 391
- Identity Association 391
- DHCP Relay Agent 392
- Prefix Delegation 392
- IPv6 Cache 393
- Multicast Listener Discovery 393
- MLD Messages 393
- APPENDIX G 397
- Appendix G Services 398
- Appendix G Services 399
- APPENDIX H 401
- Industry Canada (IC) 402
- ZyXEL Limited Warranty 403
- Registration 404
- Open Source Licenses 404
- Safety Warnings 404
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