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Chapter 10 Network Address Translation (NAT) Screens
You may enter a single port number or a range of port numbers to be forwarded, and the local
IP address of the desired server. The port number identifies a service; for example, web
service is on port 80 and FTP on port 21. In some cases, such as for unknown services or
where one server can support more than one service (for example both FTP and web service),
it might be better to specify a range of port numbers. You can allocate a server IP address that
corresponds to a port or a range of ports.
Many residential broadband ISP accounts do not allow you to run any server processes (such
as a Web or FTP server) from your location. Your ISP may periodically check for servers and
may suspend your account if it discovers any active services at your location. If you are
unsure, refer to your ISP.
10.4.1 Default Server IP Address
In addition to the servers for specified services, NAT supports a default server IP address. A
default server receives packets from ports that are not specified in this screen.
Note:
If you do not assign a
Default Server
IP address, the ZyXEL Device discards
all packets received for ports that are not specified here or in the remote
management setup.
10.4.2 Port Forwarding: Services and Port Numbers
Use the
Port Forwarding
screen to forward incoming service requests to the server(s) on your
local network.
The most often used port numbers and services are shown in
refer to RFC 1700 for further information about port numbers.
10.4.3 Configuring Servers Behind 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 78
Multiple Servers Behind NAT Example
Summary of Contents for P-2608HWL-D1
Page 2: ......
Page 24: ...P 2608HWL Dx Series User s Guide 24 Table of Contents ...
Page 32: ...P 2608HWL Dx Series User s Guide 32 List of Figures ...
Page 38: ...P 2608HWL Dx Series User s Guide 38 List of Tables ...
Page 44: ...P 2608HWL Dx Series User s Guide 44 Chapter 1 Getting To Know the ZyXEL Device ...
Page 66: ...P 2608HWL Dx Series User s Guide 66 Chapter 3 Internet and Wireless Setup Wizard ...
Page 72: ...P 2608HWL Dx Series User s Guide 72 Chapter 4 VoIP Wizard And Example ...
Page 78: ...P 2608HWL Dx Series User s Guide 78 Chapter 5 Bandwidth Management Wizard ...
Page 88: ...P 2608HWL Dx Series User s Guide 88 Chapter 6 Status Screens ...
Page 118: ...P 2608HWL Dx Series User s Guide 118 Chapter 8 LAN Setup ...
Page 138: ...P 2608HWL Dx Series User s Guide 138 Chapter 9 Wireless LAN ...
Page 166: ...P 2608HWL Dx Series User s Guide 166 Chapter 11 SIP ...
Page 176: ...P 2608HWL Dx Series User s Guide 176 Chapter 12 Phone ...
Page 184: ...P 2608HWL Dx Series User s Guide 184 Chapter 13 Phone Book ...
Page 220: ...P 2608HWL Dx Series User s Guide 220 Chapter 17 Content Filtering ...
Page 276: ...P 2608HWL Dx Series User s Guide 276 Chapter 20 Static Route ...
Page 288: ...P 2608HWL Dx Series User s Guide 288 Chapter 21 Bandwidth Management ...
Page 292: ...P 2608HWL Dx Series User s Guide 292 Chapter 22 Dynamic DNS Setup ...
Page 306: ...P 2608HWL Dx Series User s Guide 306 Chapter 23 Remote Management Configuration ...
Page 318: ...P 2608HWL Dx Series User s Guide 318 Chapter 24 Universal Plug and Play UPnP ...
Page 324: ...P 2608HWL Dx Series User s Guide 324 Chapter 25 System ...
Page 344: ...P 2608HWL Dx Series User s Guide 344 Chapter 27 Tools ...
Page 348: ...P 2608HWL Dx Series User s Guide 348 Chapter 28 Diagnostic ...
Page 360: ...P 2608HWL Dx Series User s Guide 360 Chapter 29 Troubleshooting ...
Page 378: ...P 2608HWL Dx Series User s Guide 378 Appendix B Setting up Your Computer s IP Address ...
Page 402: ...P 2608HWL Dx Series User s Guide 402 Appendix F Triangle Route ...
Page 440: ...P 2608HWL Dx Series User s Guide 440 Appendix H Internal SPTGEN ...