Security Settings
34
Broadband ADSL2+ Modem DM111PSPv2
•
For an inbound rule, click
Add
under Inbound Services.
3.
To edit or delete a rule, select its button on the left side, and click
Edit
or
Delete
.
4.
To change the order of precedence:
a.
Select its button on the left side of the table, and click
Move
.
b.
At the prompt, enter the number of the new position, and click
OK
.
5.
To open or close instant messaging, select a radio button, and click
Apply
.
•
Close IM Ports
. Disables instant messaging traffic.
•
Open IM Ports
. Enables instant messaging traffic. IM ports are open by default.
6.
Click
Apply
to save your settings.
Inbound Rules (Port Forwarding)
Because the modem 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 modem 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.
