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Modern SMTP servers apply a variety of mechanisms to stem the volume of spam delivered to users. These techniques can be broadly classified into two categories: pre-acceptance approaches, which apply prior to a message being accepted (e.g. IP reputation), and post-acceptance techniques which apply after a message has been accepted (e.g. content based signatures). We argue that the effectiveness of...
We present a method of detecting network anomalies, such as DDoS (distributed denial of service) attacks and flash crowds, automatically in real time. We evaluated this method using measured traffic data and found that it successfully differentiated suspicious traffic. In this paper, we focus on cyclic traffic, which has a daily and/or weekly cycle, and show that the differentiation accuracy is improved...
In the Internet, the rapid spread of worms is a serious problem. In many cases, worm-infected hosts generate a huge amount of flows with small size to search for other target hosts by scanning. Therefore, we defined hosts generating many flows, i.e., more than or equal to the threshold during a measurement period, as superspreaders, and we proposed a method of identifying superspreaders by flow sampling...
This paper describes the QoS control capabilities in the new Japanese academic network, SINET3. SINET3 is a nationwide QoS-aware multi-layer network for more than 700 universities and research institutions and provides a variety of high-quality network services including packet-based QoS services and circuit-based bandwidth-on-demand services. These diversified network services are provided by effectively...
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