Lukasz Chrost

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The active queue management in Internet routers exploits the idea that an incoming packet can be dropped by the router even if there is some available buffering space in the router. Therefore, the router can send congestion signals to TCP before the actual congestion occurs, preventing queues and delays from growing too high. Many active queue management(More)
Queueing systems in which an arriving job is blocked and lost with a probability that depends on the queue size are studied. The study is motivated by the popularity of Active Queue Management (AQM) algorithms proposed for packet queueing in Internet routers. AQM algorithms often exploit the idea of queue-size based packet dropping. The main results include(More)
Recently Andrew et al. proposed the TCP Evaluation suite to provide a common test suite for researchers designing new TCP extensions and AQM mechanisms. It defines network topologies, simulation scenarios i.e. traffic characteristic as well as evaluation parameters to provide a common testbed for all new enhancements. The presented remarks determine the(More)
The paper aims at depicting certain limitations of EDCA queues related to the different traffic classes. Through simulation, we show main flaws of identical, medium size, Drop Tail queues used by default for each class, with reference to different traffic category’s requirements. We propose some substitutes such as differentiated, basically smaller buffer(More)
In this paper we present three virtualization devices (Xen server, NetFPGA and EZ appliance) which have been used for implementation of data plane functionality in a Future Internet architecture, the IIP System. We give general description of these devices and present implementation of the IIP System node on each device.
The ns-2 simulator is one of the most popular and widely used discrete event network simulators. Its usage of the general purpose Tcl scripting language accompanied with a wide range of networking technologies allows users to easily create complex and differentiated simulation scenarios. The main limitation of ns-2 is its lack of support for(More)
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