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D6200 WiFi DSL Modem Router
5. To close or open the instant messaging ports, under Instant Messaging (IM) Ports, select
the appropriate radio button:
• Close IM Ports
• Open IM Ports (IM ports are open by default)
6. Click Apply.
Add Custom Services to Allow or Block
You can define your own incoming and outgoing custom services to allow or block. To add a
service for blocking, first determine which port number or range of numbers is used by the
application.
To add a custom service:
1. Select ADV
ANCED > Security > Firewall Rules.
2. Click Add Custom Service.
The Add Services screen allows you to specify or edit your own custom service definition.
You can then use the custom service when creating firewall rules.
3. In the Name field, enter a suitable name for this service.
4. In the
Type list, select the correct type for this service (if in doubt, select TCP/UDP):
• TCP
• UDP
• TCP/UDP
5. Enter the starting and ending port numbers. If the application uses a single port number
,
enter that number in both fields.
6. Click Apply.
Your information is saved, and you return to the previous screen.