In this thesis, a stateless active queue management algorithm called “PUNSI” which aims to achieve fair bandwidth allocation in congested routers is proposed. This algorithm prevents unresponsive flows from dominating available bandwidth shared with responsive flows by penalizing packets from unresponsive flows hopefully with a higher probability than those from responsive flows. It is motivate...

This paper shows the design and performance of an AQM (Active Queue Management) enabled router. The design is based on a classical proportional control system. The application of such a router is to enhance streaming media over IP performance by avoiding bursty packet drop situations, control the router queue delay, and balancing packet drop, delay, and link utilization. The selected AQM equili...

Motivated by the scale and complexity of simulating large-scale networks, recent research has focused on hybrid fluid/packet simulators, where fluid models are combined with packet models in order to reduce simulation complexity. However, these simulators still need to track the queuing dynamics of network routers, which generate considerable simulation time-complexity in a large-scale network ...

Virtual queue-based active queue management schemes have been proposed to provide low-loss, low-delay service in the Internet. In an earlier work, we had proposed a particular scheme called the Adaptive Virtual Queue (AVQ) algorithm where the capacity of the virtual queue is adapted to the traffic conditions to achieve a desired level of utilization in the network. Here, we study the choice of ...

We consider the adaptation of random early detection (RED) as an active queue management algorithm for multimedia traffic in wireless networks. We studied features of RED, multimedia data and point out a weakness in both. We show that an appropriate RED algorithm can improve multimedia data performance.

Denial Of service (DoS) attacks has become a major problem to intranet and Internet services. DoS attacks can be detected and eliminated using existing efficient Active Queue Management (AQM) schemes like RED. A new kind of DoS attacks have become more common in today’s Transmission control protocol (TCP) services, i.e., Low Rate Denial of Service (LDoS) attacks. LDoS attacks will degrade the p...

Bufferbloat is excessive latency due to overprovisioned network buffers. PIE and CoDel are two recently proposed Active Queue Management (AQM) algorithms, designed to tackle bufferbloat by lowering the queuing delay without degrading the bottleneck utilization. PIE uses a proportional integral controller to maintain the average queuing delay at a desired level; however, large Round Trip Times (...

Multimedia applications that transmit long continuous streams of data across the Internet will continue to stress networking technologies for the years to come. To help improve the performance of congestion avoidance protocols like TCP and to punish non-adaptive UDP-based applications, the IETF is considering the widespread deployment of Random Early Detection (RED) queue management. In this pa...

Recognizing that Internet congestion control is a complex nonlinear system, we propose here to use an intelligent controller to improve its stability and performance. In particular, we propose here a new, powerful, easy-to-configure and robust active queue management (AQM) scheme called adaptive neuron AQM (AN-AQM). We present extensive simulation results for AN-AQM, over a wide range of networ...

This note focuses on the stability analysis of some classes of nonlinear time-delay models, encountered as fluid models for TCP/AQM network. By combining analytical and numerical tools, the attractors of these models, as well as the local and global behaviors of the solutions are studied. Among others, the presence of a chaotic attractor is shown, which supports the proposition that TCP itself ...