Wireless-N 150 ADSL2+ Modem Router DGN1000 User Manual
Protecting Your Network 3-8
v1.1, January 2010
Considerations for Inbound Rules
• If your external IP address is assigned dynamically by your ISP, the IP address might change
periodically as the DHCP lease expires. Consider using the Dynamic DNS screen so that
external users can always find your network.
• If the IP address of the local server computer is assigned by DHCP, it might change when the
computer is rebooted. To avoid this, use the Reserved IP address feature in the LAN IP Setup
screen to keep the computer’s IP address constant.
• Local computers must access the local server using the computer’s local LAN address
(192.168.0.11 in the example in the previous figure). Attempts by local computers to access
the server using the external WAN IP address will fail.
Outbound Rules (Service Blocking)
The wireless modem router allows you to block the use of certain Internet services by computers
on your network. This is called service blocking or port filtering. You can define an outbound rule
to block Internet access from a local computer based on the following:
• IP address of the local computer (source address)
• IP address of the Internet site being contacted (destination address)
• Time of day
• Type of service being requested (service port number)
To add an outbound rule, click Add on the Firewall Rules screen:
Figure 3-6
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