Broadband Communications, Networks, and Systems: 7th by Nikos Fotiou, Pekka Nikander, Dirk Trossen, George C.

By Nikos Fotiou, Pekka Nikander, Dirk Trossen, George C. Polyzos (auth.), Ioannis Tomkos, Christos J. Bouras, Georgios Ellinas, Panagiotis Demestichas, Prasun Sinha (eds.)

This ebook constitutes the completely refereed post-conference lawsuits of the seventh overseas ICST convention on Broadband Communications, Networks and platforms (BROADNETS 2010) held in October 2010 in Athens, Greece. The 39 revised complete papers have been rigorously chosen from various submissions. The convention was once divided in three tracks: Optical, instant and net. The optical song covers themes akin to optical change architectures, trustworthy optical networking, routing, wavelength task, and site visitors grooming, community keep an eye on and administration. The instant music highlights MIMO and OFDM options, mobility administration, routing protocols, hybrid networks and the web music covers routing, scheduling, defense, belief, semantic applied sciences and social networks.

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Extra resources for Broadband Communications, Networks, and Systems: 7th International ICST Conference, BROADNETS 2010, Athens, Greece, October 25–27, 2010, Revised Selected Papers

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Indeed, emulation approaches and specifically those based on the Emulab software are becoming very popular [4]. Emulab is a network testbed, able to recreate a wide range of experimentation environments in which researchers can develop, debug and evaluate a complex system [5]. Emulation is particularly useful for security and resilience analysis [6],[7], because in order to study resilience a researcher has to expose the systemunder-test to high load and extreme conditions. In this paper we present a study of different parameters that might influence the repeatability of experiments on top of an Emulab-based testbed.

First, the delay-node-shaping strategy uses extra PCs to emulate network links. These PCs, called delay nodes, run Dummynet to simulate link level characteristics [12]. Second, the end-node-shaping strategy does not use extra resources and therefore runs Dummynet inside the end user nodes. In this paper we don’t use the end-node-shaping strategy as it can lead to unstable and unrealistic results [13]. e. the ability to repeat an experiment and obtain the same or statistically consistent results) a controlled environment is needed.

Keywords: emulation, network test-bed, repeatability, traffic generators. 1 Introduction Emulation testbeds are increasingly used in an effort to address the lack of scientific rigor [1] and realism as well as to promote repeatable experiments in the area of distributed systems and networking [2]. , the Internet, could be carried out by experimenting with real systems, software simulators or hardware emulators. Experimentation with real production systems suffers from the inability to control the experiment environment in order to reproduce results.

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