If you select the IP Filtering check box, the gateway filters the packets transmitted from the port range of the source IP address segment to the port range of the destination IP address segment. The protocol can be set to TCP, UDP, TCP/UDP, ICMP, or any of the combinations. The source IP address segment ranges from the source start address to the source end address; the source port range is from the source start port to the source end port; the destination IP address segment ranges from the destination start address to the destination end address; the destination port range is from the destination start port to the destination end port. The interface indicates the direction from which the packet enters. You can define the priorities of the filtering rules. When Disable is displayed in Status, it indicates that the rule is disabled. Accept indicates that the packets that conform to the rule are allowed to pass. Reject indicates that the packets that conform to the rule are not allowed to pass.