User`s manual

4. Port Filter
Broadband Router’s Service Filter Firewall controls the LAN client’s access to the
Internet services by specifying the port number of the service in the list.
A. Disable
If checked the LAN client can access to all Internet services.
B. Blocking the following port
If checked the LAN client cannot access service using that port For example,
blocking port 21. The LAN client cannot access ftp in the Internet.
C. Forwarding the following port only
Checking this item will cause LAN clients to only access services using ports
listed. For example, forwarding port 21.The LAN clients can only access ftp in
the Internet.
Please refer to Appendix B: Common Port Numbers.
37