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Firewall
You may setup rewall rules to protect your network from 
viruses, worms and malicious activity on the Internet. 
NOTE:
You can set the maximum to 10 ltering items for MAC/IP/ 
Port Filtering, URL Filtering and Port Forwarding.
•    MAC/IP/Port Filtering
Select Settings > Firewall > Port Filtering, the Mac/IP/
Port Filtering is shown in the following gure: