Security Settings
51
N150 Wireless ADSL2+ Modem Router DGN1000
Inbound Rules (Port Forwarding)
Because the wireless modem router uses Network Address Translation (NAT), your network
presents only one IP address to the Internet, and outside users cannot directly address any
of your local computers. However, by defining an inbound rule you can make a local server
(for example, a Web server or game server) visible and available to the Internet.
The rule tells the wireless modem router to direct inbound traffic for a particular service to one
local server based on the destination port number. This is also known as port forwarding.
Allowing inbound services opens holes in your firewall. Enable only those ports that are
necessary for your network. The following are two examples of inbound rules.
Note: Some residential broadband ISP accounts do not let you run server
processes (such as a Web or FTP server) from your location. Your
ISP might periodically check for servers and suspend your account if
it discovers any active services at your location. If you are unsure,
refer to the acceptable use policy of your ISP.
Inbound Rule Example: A Local Public Web Server
If you host a public Web server on your local network, you can define a rule to allow inbound
Web (HTTP) requests from any outside IP address to the IP address of your Web server at
any time of day, as shown here and described in the following figure:
Figure 9. Allow inbound Web requests
Service. From this list, select the application or service you want to allow or block. The list
already displays many common services, but you are not limited to these choices. Use the
Services screen to add any additional services or applications that do not already appear.
See Configure Services on page 54.
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