| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication monitoring system having high reliability and capable of being obtained at a low cost. <P>SOLUTION: A traffic measuring unit 120 is designed to measure the traffic of a network interface unit 110 by a measuring cycle determined by an analysis segment designating unit 140. A statistics calculating unit 150 is designed to perform a statistics process of header information analyzed by a packet analyzing unit 130 in every measuring cycle. A feature information holding unit 160 is designed to create and hold the feature information including output data of the traffic measuring unit 120 and the statistics calculating unit 150 as feature items in every measuring cycle. A data base unit 170 is designed to sequentially accumulate old feature information. An abnormality detecting unit 180 is designed to read the feature information existing within a range of similarity with new feature information in predetermined feature items whenever the new feature information is created, to statistically calculate a normal range about other feature items among the read feature information, and to detect the abnormality by comparing the new feature information with the other feature items. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
