Wireless ADSL2+ Modem Router DG834Gv5 User Manual
3-8
Protecting Your Network
v1.0, March 2010
–
Never
. No log entries will be made for this service.
–
Always
. Any traffic for this service type will be logged.
–
Match
. Traffic of this type that matches the rule will be logged.
–
Not match
. Traffic of this type that does not match the rule will be logged.
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 feature 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 menu 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 previous example). Attempts by local computers to access the server using the
external WAN IP address will fail.
Outbound Rules (Service Blocking)
The 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 inbound rule:
1.
From the Firewall Rules screen, click
Add
in the Outbound Rules section to display the
following screen:
