Chapter 11 Network Address Translation (NAT)
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WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host.
Port Forwarding
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make visible to the outside world even though NAT makes your whole inside network
appear as a single computer to the outside world.
Finding Out More
See
for advanced technical information on NAT.
11.2 The Port Forwarding Screen
Use the Port Forwarding screen to forward incoming service requests to the server(s) on your
local network.
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.
The most often used port numbers and services are shown in
. Please refer
to RFC 1700 for further information about port numbers.
Note: 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.
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
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Страница 8: ...Contents Overview VMG1312 B10A User s Guide 8 Troubleshooting 291 ...
Страница 18: ...Table of Contents VMG1312 B10A User s Guide 18 ...
Страница 19: ...19 PART I User s Guide ...
Страница 20: ...20 ...
Страница 34: ...Chapter 2 The Web Configurator VMG1312 B10A User s Guide 34 ...
Страница 39: ...Chapter 4 Tutorials VMG1312 B10A User s Guide 39 7 Click Apply to save your settings ...
Страница 79: ...79 PART II Technical Reference ...
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Страница 168: ...Chapter 9 Routing VMG1312 B10A User s Guide 168 ...
Страница 186: ...Chapter 10 Quality of Service QoS VMG1312 B10A User s Guide 186 ...
Страница 212: ...Chapter 13 Interface Group VMG1312 B10A User s Guide 212 ...
Страница 228: ...Chapter 15 Firewall VMG1312 B10A User s Guide 228 ...
Страница 234: ...Chapter 17 Parental Control VMG1312 B10A User s Guide 234 ...
Страница 244: ...Chapter 19 Certificates VMG1312 B10A User s Guide 244 ...
Страница 248: ...Chapter 20 Log VMG1312 B10A User s Guide 248 ...
Страница 252: ...Chapter 21 Traffic Status VMG1312 B10A User s Guide 252 ...
Страница 258: ...Chapter 24 IGMP Status VMG1312 B10A User s Guide 258 ...
Страница 262: ...Chapter 25 xDSL Statistics VMG1312 B10A User s Guide 262 ...
Страница 264: ...Chapter 26 User Account VMG1312 B10A User s Guide 264 ...
Страница 270: ...Chapter 29 TR 064 VMG1312 B10A User s Guide 270 ...
Страница 274: ...Chapter 30 Time Settings VMG1312 B10A User s Guide 274 ...
Страница 280: ...Chapter 32 Logs Setting VMG1312 B10A User s Guide 280 ...
Страница 298: ...Chapter 36 Troubleshooting VMG1312 B10A User s Guide 298 ...
Страница 338: ...Appendix C Pop up Windows JavaScripts and Java Permissions VMG1312 B10A User s Guide 338 ...
Страница 352: ...Appendix D Wireless LANs VMG1312 B10A User s Guide 352 ...
Страница 368: ...Appendix G Legal Information VMG1312 B10A User s Guide 368 ...
Страница 376: ...VMG1312 B10A User s Guide 376 Index ...
Страница 377: ...Index VMG1312 B10A User s Guide 377 ...
Страница 378: ...VMG1312 B10A User s Guide 378 Index ...