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Our network infrastructure is exposed to persistent threats of DDoS and many unknown attacks. These threats threaten the availability of ISP's network and services. This paper proposes network-based anomalous traffic detection method and presents an anomalous traffic detection system, its architecture and main function blocks. Every five minutes, traffic information and security events are gathered in a central server and new arrival traffic is compared with the already generated baseline traffic. This approach is exploring an anomalous traffic detection based on time series traffic modeling and analyzing traffic by time of day, day of week, and special days. To improve the accuracy of detection, we analyze flow information and security events. We developed an anomalous traffic detection system and deployed on the aggregation points of enterprise network.