Testing the Fidelity of an Emulab Testbed

Garcia, Andres Perez; Siaterlis, Christos; Masera, Marcelo

doi:10.1109/icdcsw.2010.74

Cited by 6 publications

(2 citation statements)

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“…In order to analyse resilience of a networked system that depends from ICT, like the Internet, Garcia et al (2010) present a hardware-based emulation (emulation testbed). The authors study the fidelity of the emulation by comparing experimental results between two different emulation configurations against the reference real configuration.…”

Section: Techno-centric Resiliencementioning

confidence: 99%

Reviewing qualitative research approaches in the context of critical infrastructure resilience

2021

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Modern societies are increasingly dependent on the proper functioning of critical infrastructures (CIs). CIs produce and distribute essential goods or services, as for power transmission systems, water treatment and distribution infrastructures, transportation systems, communication networks, nuclear power plants, and information technologies. Being resilient becomes a key property for CIs, which are constantly exposed to threats that can undermine safety, security, and business continuity. Nowadays, a variety of approaches exist in the context of CIs’ resilience research. This paper provides a state-of-the-art review on the approaches that have a complete qualitative dimension, or that can be used as entry points for semi-quantitative analyses. The study aims to uncover the usage of qualitative research methods through a systematic review based on PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). The paper identifies four principal dimensions of resilience referred to CIs (i.e., techno-centric, organisational, community, and urban) and discusses the related qualitative methods. Besides many studies being focused on energy and transportation systems, the literature review allows to observe that interviews and questionnaires are most frequently used to gather qualitative data, besides a high percentage of mixed-method research. The article aims to provide a synthesis of literature on qualitative methods used for resilience research in the domain of CIs, detailing lessons learned from such approaches to shed lights on best practices and identify possible future research directions.

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Section: Techno-centric Resiliencementioning

confidence: 99%

Reviewing qualitative research approaches in the context of critical infrastructure resilience

2021

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“…A different approach is taken by the end-node-shaping strategy that does not use extra resources and therefore runs Dummynet inside the end user's experimental nodes. In Section III-B we show that the endnode-shaping strategy can lead to unstable and unrealistic results [17].…”

Section: The Emulab Platform and Its Featuresmentioning

confidence: 99%

On the Use of Emulab Testbeds for Scientifically Rigorous Experiments

Siaterlis

Garcia

Genge

2013

IEEE Commun. Surv. Tutorials

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Abstract-Internet is considered a Critical Infrastructure (CI) that is vital for both the economy and the society. Disruptions caused by natural disasters, malicious human actions and even hardware failure pose serious risks. Emulation testbeds are increasingly used to study the Internet in order to improve protection and response mechanisms. These are frequently considered more adequate than software simulators to realistically recreate the complex behavior of networks. In this paper we study how testbeds based on the Emulab software can be used to conduct scientifically rigorous experiments, specifically in terms of: a) experiment fidelity, b) repeatability, c) measurement accuracy, and d) interference.Our study, which is based on extensive experimentation on different testbeds, indicates that the current trend of using emulation testbeds is justified as both realistic and efficient. We show that Emulab-based experiments are representative of real systems in terms of emerging behavior (qualitative) and that repeatable experiments are possible. The main contribution of this tutorial article is that based on experimental results we identified caveats and provided insights to significant configuration parameters and limitations that are further elaborated into a set of guidelines that any Emulab user should be aware of. Then, he/she can decide about the importance of each guideline in the context of a specific study and experiment.

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