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Chapter 8 Network Address Translation (NAT)
LTE6100 User’s Guide
60
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.
8.2 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 10.0.0.35 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 30
Multiple Servers Behind NAT Example
A=10.0.0.33
D=10.0.0.36
C=10.0.0.35
B=10.0.0.34
WAN
LAN
10.0.0.1
IP Address assigned by ISP
Summary of Contents for LTE6100
Page 4: ...Contents Overview LTE6100 User s Guide 4...
Page 11: ...11 PART I User s Guide...
Page 12: ...12...
Page 16: ...Chapter 1 Introduction LTE6100 User s Guide 16...
Page 24: ...24...
Page 30: ...Chapter 3 Connection Status and System Info LTE6100 User s Guide 30...
Page 38: ...Chapter 4 Broadband LTE6100 User s Guide 38...
Page 48: ...Chapter 6 Routing LTE6100 User s Guide 48...
Page 66: ...Chapter 8 Network Address Translation NAT LTE6100 User s Guide 66...
Page 78: ...Chapter 10 Firewall LTE6100 User s Guide 78...
Page 84: ...Chapter 12 Parental Control LTE6100 User s Guide 84...
Page 104: ...Chapter 15 Traffic Status LTE6100 User s Guide 104...
Page 106: ...Chapter 16 User Account LTE6100 User s Guide 106...
Page 120: ...Chapter 22 Backup Restore LTE6100 User s Guide 120...
Page 122: ...Chapter 23 Diagnostic LTE6100 User s Guide 122...
Page 166: ...Appendix B Setting Up Your Computer s IP Address LTE6100 User s Guide 166...
Page 176: ...Appendix C Pop up Windows JavaScript and Java Permissions LTE6100 User s Guide 176...
Page 180: ...Appendix D Common Services LTE6100 User s Guide 180...
Page 184: ...Appendix E Legal Information LTE6100 User s Guide 184...
Page 188: ...Index LTE6100 User s Guide 188...
Page 189: ...Index LTE6100 User s Guide 189...