Cesar Marcondes

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We present a measurement study of TCPW BBE (Bandwidth and Buffer Estimations) [5] and associated path characteristics estimation techniques over large pipes. Our study addresses the accuracy of our inline estimation methods used in TCPW BBE. Buffer size, capacity, and achieved rate estimation are used in TCPW BBE. We shed some light on the accuracy and(More)
Knowing the capacity of an Internet path is important for efficient network utilization, pricing, and management. Using the capacity information, one can provide better TCP congestion control, multimedia streaming, P2P peer selection, and overlay structuring. Capacity estimation has been extensively studied. Though current approaches have been able to(More)
The paper describes a measurement campaign carried out by the University of Bologna (UoB), the National Inter-University Consortium for Telecommunications (CNIT) and the University of California Los Angeles (UCLA). The aim of the experiments was the performance assessment of a wide range of TCP enhancements on network environments that include a real GEO(More)
This paper presents FlexForward, an approach for dynamically manage SDN data plane forwarding mechanisms. This feature leverages SDN flexibility in two aspects: (i) it provides a new management method, in which topological infrastructure requirements are satisfied by the most appropriate forwarding mechanism, residing in each managed network element; (ii)(More)
Mininet is a popular container-based emulation environment built on Linux for testing Open Flow applications. Using Mininet, one can compose an experimental network using a set of virtual hosts and virtual switches with flexibility. However, it is well understood that Mininet can only provide a limited capacity, both for CPU and network I/O, due to its(More)
In this paper, we address the problem of how TCP sessions ramp up their transmission windows in a controlled way. We introduce a conservative slow start scheme that reduces to the regular slow start when session path queues are empty, but slows down the control window increase speed as buffers start to build up. We show via event driven simulation and open(More)
In today’s ever-changing network, new challenges arise with the presence of various types of physical links, such as high speed, satellite, and wireless networks. The common solution is to create a new TCP algorithm that is optimized for each challenge encountered. One example of this is TCP Hybla, which was designed to tackle satellite paths. On the other(More)
In this paper, we present the design, implementation and evaluation of a new TCP protocol, TCP-AW (TCP Adaptive Westwood). This study was motivated by the intent to address simultaneously several challenging network scenarios, including high bandwidth efficiency in long and fat pipes, RTT fairness, and friendliness to legacy protocol, in a single protocol.(More)
Experiments in real satellite testbeds are relatively rare in practice. In this paper, we are going to share our experience on using one, and comment on selected sets of results that we've conducted in such mixed Internet and GEO-Satellite environment. The selected material includes: characterization of an induced error-prone satellite channel; results from(More)