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An Internet Service Provider's (ISP) network infrastructure and its properties often constitute a critical business secret, not only because the smarter investment of a given resource budget yields a competitive advantage, but also because the discovery of, e.g., bottlenecks, may be exploited for attacks or bad publicity. Hence, providers around the world are often reluctant to open the infrastructure to novel technologies and applications that might lead to information leaks. This paper raises the question whether today's virtualization trend in the Internet, and especially the network virtualization paradigm, can be used to obtain information about the infrastructure.
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