| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To perform understanding and non-communication confirmation even in a packet sequence, where correspondence between a data packet and an ACK (Acknowledgement) packet does not satisfy, with respect to a understanding confirmation technology in a network communication system. <P>SOLUTION: An input section 101 receives a packet flowing on a network. A packet information acquisition section 102-1 acquires, from the received packet, packet information including transmission source address information, destination address information, order control information (sequence number), and approval response information (ACK flag, confirmation response number). On the basis of the packet information, a non-communication/understanding detection section 102-2 detects a understanding state including non-communication or understanding between a host, that is a transmission source of the received packet, and a host of the destination. By combining a change tendency of the order control information with the approval response information, it is detected whether non-communication occurs between the host that is the transmission source of the received packet and an apparatus itself or between the apparatus itself and the host that is the destination of the received packet. An output section 104 outputs the conduction state. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
