Considerations For Port Forwarding - NETGEAR CG3100Dv3 User Manual

a web server or game server) or computer visible and available to the Internet. The rule tells
the Gateway to direct inbound traffic for a particular service to one local server or computer
based on the destination port number. This is also known as port forwarding.
Some residential broadband ISPs do not allow you to run server processes (such as a Web
or ftp server) from your location. Your ISP might check for servers and suspend your account
if it finds active services at your location. See your ISP's Acceptable Use policy.
To configure port forwarding and services for specific inbound traffic:
1. In the main menu, under Advanced, select Port Forwarding.
2. In the Service field, select a service from
the drop-down list. (For example, FTP,
which uses TCP ports 20 and 21.)
3. To add a custom rule that is not in the list of
services, specify these settings in the Add
Custom Rules table:
• Name. Enter a name for the service.
• Start Port. Enter the start port for the
service.
• End Port.Enter the end port for the
service.
• Protocol. Select the protocol for the
ports:
- TCP. Select TCP only.
- UDP. Select UDP only.
- Both. Select both TCP and UDP.
• Local IP Address. Complete the local IP address for the computer that is using the
service.
4. Perform one of these actions:
• Click Add. The Active Forwarding Rules table displays the list of forwarded ports.
• To delete a service, select the radio button in the Active Forwarding Rules table for the
service that you want to delete, and then click Delete.
• To reset the selection in the Services field and to clear all the fields in the Add Custom
Rules table, click Reset.

Considerations for Port Forwarding

• If the IP address of the local server PC is assigned by DHCP, it might change when the
PC is rebooted. To avoid this, you can assign a static IP address to your server outside
the range that is assigned by DHCP, but in the same subnet as your LAN. By default, the
IP addresses from 192.168.1.2 through 192.168.1.9 are reserved for this purpose.
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