Enable Packet Filter: Enable or disable “packet filter” function 
Policy: The filter rule’s policy, you can choose the following options 
 Discard the Following--Discard packets conform to the following rules, Accept all 
other packets (“black list”) 
Only  Accept  the  Following--  Accept  only  the  data  packets  conform  to  the 
following rules, discard all other packets (“white list”) 
 
Direction 
Input: packet from WAN to LAN  
output: packet from LAN to WAN  
Interface : specify if this rule applies to the main WAN, backup WAN or both 
Protocol : packet Protocol type 
Source Ports : packet's source port 
Destination Ports : packet's destination port 
Source IP: packet's source IP address