User's Manual

Security
79
N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
described in Firewall Rules on page 76) and the Port Forwarding/Inbound Services screen
(as described in Port Forwarding and Triggering on page 108).
¾
To add a custom service:
1. Click Add Custom Service to add a service. The Add Service screen displays:
The Add Service screen allows you to specify or edit your own custom service definition.
You can then use the custom service when creating firewall rules.
2. T
o add a service for blocking, first determine which port number or range of numbers is used
by t
he application.
3. Name. In the Name field, enter a suitable name for this service.
4. Type. Select the correct type for this service (if in doubt, select TCP/UDP):
• TCP
• UDP
• TCP/UDP
5. Start Port and End Port. Enter the starting and ending port numbers. If the application uses
a single port number, enter that number in both fields.
6. Click Apply to save your information and return to the previous screen.