User's Manual

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Chapter 5 - RouteFinder Manager
Enable IP Mapping - Virtual Server
IP Mapping is available only when NAT is enabled. If NAT is enabled for a particular port, that port is
firewall protected. The Enable IP Mapping function allows you to open a “hole” in your firewall to
allow access to your LAN via the Internet. For example, you can use the IP mapping function to
access an FTP server on your LAN via the Internet. IP Mapping is most suitable to fixed or static IP
addressing.
1. To enable IP Mapping, from the General Settings dialog box, select Enable IP Mapping, then
click IP Mapping (Virtual Server).
2. The Virtual Server Mapping dialog box displays.
For each service you want to set up:
1. Select either the WAN or Async (Serial) port from the Port No list.
2. Enter the External IP address supplied by your ISP. If your ISP uses dynamic IP addressing,
enter 0.0.0.0. Your device will use the dynamically assigned address when connecting to your
ISP.
3. Enter the TCP/IP port number for the service that you will be using for IP mapping. Common
TCP/IP port numbers are listed below:
WWW Port 80
FTP Port 20 or 21
SMTP Port 25
POP3 Port 110
If you would like to map all services for this external IP address to a computer on your LAN, you
can enter port number 0. This means that whenever anyone accesses your external IP address,
they will automatically be “mapped” to the internal computer that you specify, regardless of what
port number they are using.
4. Enter the Internal IP address of the server to which you want to map the External IP address.
5. Enter the port number for the service that you will be using for this IP mapping.
Click Insert to include the mapping.
6. Click OK when you have completed mapping addresses.
Note: IP Mapping function allows you to have only one port service on your LAN. For example, if
you map an external IP (16.895.1.3) to an internal IP address (192.168.2.22 - a www server),
only the internal IP address in your local network can serve as the www.server for the external IP
address.