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In order to design the congestion control scheme in the routers, an Active Queue Management (AQM) is proposed. This is used to control congestion at the router, where packets are dropped before queue becomes full. A new framework of AQM, namely NEWQUE with Per-flow Scheduling (PerNEWQUE) active queue management algorithm supporting explicit congestion notification (ECN), is proposed by extending scheduling...
Random Early Detection (RED) algorithm, a framework of active queue management (AQM), has been proposed in order to improve the performance of congestion routers due to the increased use of Internet. But, the basic problem of a lag between congestion's occurrence and its remedy remained. To overcome this problem of RED, Explicit Congestion Notification (ECN) proposed by the IETF that allows end-to-end...
Future Internet, Inherent Network Management (INM) and business aspects such as OPEX/CAPEX are topics of vivid research activity for quite some time. This paper focuses on the combination of the three areas, showing what is expected from recent Future Internet activities based on experience in the 4WARD project founded by the European Union. We briefly introduce the notion of INM and the related de-sign...
In this paper, we discuss how to discriminate the queue type in the network for end-to-end congestion control. FAST TCP is one of end-to-end congestion avoidance techniques and designed to accept FIFO and drop tail queue. However, existing AQM routers in the recent Internet may interrupt that such end-to-end congestion avoidance protocols perform well. At first, we examine the behavior of FAST TCP...
The QoS (Quality of Service) is an important factor in computer networks. Here we proposed an effective queuing discipline for obtaining QoS and thus the throughput is increased. The SQP is a stateless queue management algorithm. The SQP allocates variable bandwidth for TCP (Transmission Control Protocol) flows and performs the matched drops in the queue. Based on the priority of TCP flow the queuing...
Pulsing denial-of-service (PDoS) attacks pose a serious problem on the Internet. The attacker periodically sends high-rate traffic over a short period. As a result, because packets are dropped from legitimate TCP flows, they are forced to degrade their throughput. A problem with conventional methods is that bursty short-lived TCP flows may be mistaken for PDoS attacks and their throughput will be...
We present a centralized integrated approach, ADWISER, for (i) managing an Internet access link bandwidth, and (ii) for enhancing the performance of an IEEE 802.11 WLAN. Our single-box approach is an extension to our previous work, where we focused on meeting TCP performance objectives over WLANs. In this work, we present a novel cascaded packet scheduling algorithm to address the issue of unfair...
The analysis of Internet traffic behavior under the pressure of long range dependence congestion factors has a great importance for performance management, anomaly detection and QoS control. The choice of methods using for analysis depends on the goal of description, accuracy requirements, measurement tools and assumptions concerning stochastic feature of network processes. Analysis without robust...
Internet traffic measurements and traffic characterization are essential for managing and optimizing network infrastructures. The increasing number of wireless Internet users and the changing application demands require consecutive traffic measurements. Therefore, we have performed measurements of home users at a broadband wireless access service provider in order to reflect the current traffic characteristics...
Motivated by providing differentiated services on the Internet, we consider efficient online algorithms for buffer management in network switches. We study a FIFO buffering model, in which unit-length packets arrive in an online manner and each packet is associated with a value (weight) representing its priority. The order of the packets being sent should comply with the order of their arriving time...
Recently, several papers have studied the possibility of shrinking buffer sizes in Internet core routers to just a few dozen packets under certain constraints. If proven right, these results can open doors to building all-optical routers, since a major bottleneck in building such routers is the lack of large optical memories. However, reducing buffer sizes might pose new security risks: it is much...
We provide a minimal overhead FIFO queue management scheme which controls link congestion and realizes long-term flow fairness. The proposed scheme is very simple but effective to regulate long term high bandwidth flows. The proposed scheme uses light resources including additional small fixed size memory. The evaluation result verifies the max-min convergence of the proposed mechanism and shows that...
Motivated by providing differentiated services on the Internet, we consider efficient algorithms for buffer management in quality-of-service (QoS) routers. We study a FIFO buffering model with fairness constraint, in which packets have values to represent their priorities. The order of packets being sent complies with the order of their arriving time. Fairness is enforced such that the dropping rate...
Connectivity limitations of the current Internet pose challenges to e-Science infrastructure, as communication between resources is of key importance for the sharing of hardware, software and data across geographically distributed institutions. To overcome such limitations many overlay networks have been developed. Existing solutions report performance that can keep up with slow wide-area links -...
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