Arcadyan Technology Corporation WG7005B ユーザーズマニュアル

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Stateful Packet Inspection 
This is called a “stateful” packet inspection because it examines the 
contents of the packet to determine the state of the communications; i.e., it 
ensures that the stated destination computer has previously requested the 
current communication. This is a way of ensuring that all communications 
are initiated by the recipient computer and are taking place only with