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            NTU Optical Network Terminals    45 
–  Filter Name—text description of the filter; 
–  IP Version—select IP protocol version; 
–  Protocol—select protocol (TCP/UDP, TCP, UDP, ICMP); 
–  MAC address—source MAC address; 
–  Source IP address[/prefix length]—source IP address (the prefix length can be specified after a slash); 
–  Source Port (port or port:port)—source port or port range separated by a colon; 
–  Destination IP address[/prefix length]—destination IP address (the prefix length can be specified after a 
slash); 
–  Destination Port (port or port:port)—destination port or port range separated by a colon. 
Click the Apply/Save button to accept and save the settings. 
Filtration Settings for Incoming Traffic 
 
 
When a firewall is enabled in a WAN or LAN interface, it blocks all incoming traffic which does not meet 
the set rules.  
 
Click the Add button to add a new filtration rule. 
 
–  Filter Name—text description of the filter; 
–  IP Version—select IP protocol version; 
–  Protocol—select a network protocol; 
–  Source MAC address—source MAC address; 
–  Source IP address[/prefix length]—source IP address (the prefix length can be specified after a slash); 
–  Source Port (port or port:port)—source port/ports; 
–  Destination IP address[/prefix length]—destination IP address (the prefix length can be specified after a 
slash); 
–  Destination Port (port or port:port)—destination port/ports;