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Prestige 623ME-T User’s Guide
NAT 5-3
Figure 5-2 Multiple Servers Behind NAT Example
Please note that a server can support more than one service, e.g., a server can provide both FTP and DNS
service, while another provides only web service. Also, since you need to specify the IP address of a server
in the Prestige, a server must have a fixed IP address and not be a DHCP client whose IP address potentially
changes each time it is powered on.
In addition to the servers for specific services, SUA supports a default server. A service request that does not
have a server explicitly designated for it is forwarded to the default server. If the default server is not
defined, the service request is simply discarded.
The most often used port numbers are described in the following table:
Table 5-1 NAT Mode
SERVICES PORT NUMBER
FTP (File Transfer Protocol) 21
Telnet 23
SMTP (Simple Mail Transfer Protocol) 25
DNS(Domain Name System) 53
HTTP (Hyper Text Transfer Protocol or WWW, Web) 80
PPTP (Point-to-Point Tunneling Protocol) 1723
- Prestige 623ME-T 1
- Copyright 3
- (FCC) Interference Statement 5
- ZyXEL Limited Warranty 7
- Customer Support 9
- Table of Contents 11
- List of Figures 17
- List of Tables 21
- List of Charts 23
- Preface 25
- Introduction to DSL 27
- Part I: 29
- Chapter 1 31
- 1.3.1 Internet Access 33
- Chapter 2 35
- Wizard Setup 36
- Navigation panel 36
- 2.4 Configuring Password 37
- 2.5 Resetting the Prestige 38
- Chapter 3 39
- 3.3 Multiplexing 40
- 3.4 VPI and VCI 40
- DESCRIPTION 41
- 3.7 IP Address Assignment 42
- 3.8 NAT 43
- 3.9.2 PPPoE 44
- 3.10 DHCP Setup 45
- 3.10.1 IP Pool Setup 46
- Part II: 47
- Chapter 4 49
- LAN Setup 49
- 4.4 LAN TCP/IP 50
- 4.4.3 RIP Setup 51
- 4.4.4 Multicast 51
- 4.5 Configuring LAN 52
- LAN Setup 4-5 53
- Table 4-1 LAN 53
- Part III: 55
- Chapter 5 57
- 5.2.1 Advantages of SUA 58
- 5.3 Selecting the NAT Mode 60
- 5.4 Configuring SUA Server 60
- NAT 5-5 61
- 5-6 NAT 62
- Chapter 6 63
- Dynamic DNS Setup 63
- Part IV: 65
- Chapter 7 67
- 7.2 Telnet 68
- 7.3 FTP 68
- 7.4 Web 69
- Table 7-1 Remote Management 70
- Chapter 8 71
- 8.2 UPnP and ZyXEL 72
- Part V: 79
- Chapter 9 81
- Maintenance 9-3 83
- Table 9-1 System Status 83
- 9.2.1 System Statistics 84
- Maintenance 9-5 85
- 9.3 DHCP Table Screen 86
- 9.4 Diagnostic Screens 86
- 9.5 Firmware Screen 90
- Part VI: 93
- Chapter 10 95
- Introducing the SMT 95
- 10-2 Introducing the SMT 96
- ? > or ChangeMe 97
- Chapter 11 101
- General Setup 101
- 11-4 General Setup 104
- Chapter 12 105
- LAN Setup 105
- 12-4 LAN Setup 108
- Chapter 13 109
- Internet Access 109
- Chapter 14 113
- Remote Node Configuration 113
- 14.3 Metric 117
- 14.5 Remote Node Filter 121
- Separate VPI and 124
- VCI numbers must 124
- Only one set of VPI 125
- Chapter 15 127
- Static Route Setup 127
- Static Route Setup 15-3 129
- 15-4 Static Route Setup 130
- Chapter 16 131
- Bridging Setup 131
- Bridge= Yes 132
- Edit IP/Bridge= Yes 132
- 16-4 Bridging Setup 134
- Chapter 17 135
- NAT= SUA Only 136
- 17.3 NAT Server Setup 137
- 17.4 General NAT Examples 137
- 17.4.2 How to configure NAT 138
- Part VII: 141
- Chapter 18 143
- Filter Configuration 143
- Outgoing 144
- Filter Rule 145
- Filter Set 145
- 18.3.1 TCP/IP Filter Rule 149
- Filter Configuration 18-9 151
- 18.3.2 Generic Filter Rule 154
- 18.4 Filter Types and NAT 156
- 18.5 Example Filter 156
- 18.6.1 Ethernet Traffic 160
- 18.6.2 Remote Node Filters 160
- Chapter 19 163
- SNMP Configuration 163
- 19.2 Supported MIBs 164
- 19.3 SNMP Configuration 164
- 19.4 SNMP Traps 166
- Chapter 20 167
- 20.3 System Information 169
- 20.4 Log and Trace 171
- 20.4.2 Syslog and Accounting 172
- 20.5 Diagnostic 174
- Chapter 21 177
- Maintenance 177
- 21.2 Backup Configuration 178
- 21.2.1 Backup Configuration 179
- 21.2.4 GUI-based FTP Clients 180
- 21.2.7 TFTP Command Example 181
- 21.3 Restore Configuration 182
- 21.3.1 Restore Using FTP 183
- 21.4.1 Firmware File Upload 184
- 21.4.5 TFTP File Upload 186
- Chapter 22 189
- System Maintenance 189
- 22.2 Call Control Support 190
- 22.3 Time and Date Setting 191
- 10. Time and Date Setting 192
- 22.3.1 Resetting the Time 193
- Chapter 23 195
- Remote Management 195
- 23.4 System Timeout 197
- Chapter 24 199
- IP Policy Routing 199
- IP Policy Routing 24-3 201
- 24.5 Applying an IP Policy 203
- IP Policies= 1,2 207
- Chapter 25 209
- Call Scheduling 209
- Part VIII: 213
- Appendix A 215
- Troubleshooting 215
- A.2 Telnet 216
- A.3 Web Configurator 217
- A.5 LAN Interface 218
- A.6 WAN Interface 218
- A.7 Internet Access 219
- A.8 Remote Node Connection 220
- Appendix B 221
- IP Subnetting 221
- B-8 IP Subnetting 228
- Appendix C 229
- Appendix D 231
- Installing Components 232
- Configuring 232
- Verifying Settings 234
- Windows 2000/NT/XP 235
- Macintosh OS 8/9 239
- Appendix E 243
- Virtual Circuit Topology 243
- Appendix F 245
- Splitters and Microfilters 245
- Appendix G 247
- Appendix H 249
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