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97PolicyThis section provides the Administrator with facilities to sent control policies for packets withdifferent source IP addresses, source ports, destination IP addresses, and destination ports.Control policies decide whether packets from different network objects, network services, andapplications are able to pass through the Security Bandwidth Manager.What is Policy?The device uses policies to filter packets. The policy settings are: source address,destination address, services, permission, packet log, packet statistics, and flow alarm. Basedon its source addresses, a packet can be categorized into:(1). Outgoing: a client is in the LAN networks, while a server is in the WAN networks.(2) Incoming, a client is in the WAN networks, while a server is in the LAN networks.How do I use Policy?The policy settings are source addresses, destination addresses, services, permission, log,statistics, and flow alarm. Among them, source addresses, destination addresses and IPmapping addresses have to be defined in the Address menu in advance. Services can beused directly in setting up policies, if they are in the Pre-defined Service menu. Customservices need to be defined in the Custom menu before they can be used in the policysettings.If the destination address of an incoming policy is a Mapped IP address or a Virtual Serveraddress, then the address has to be defined in the Virtual Server section instead of theAddress section.