Computers and Internet have evolved into necessary tools for our professional, personal and social lives. As a result of this growing dependence, there is a concern that these systems remain protected and available. This concern increases exponentially when considering systems such as smart power grids. Therefore, research should be conducted to develop effective ways of detecting system anomalies. To have realistic results, the studies should be tested on real systems. However, it is not possible to test these experiments on the live network. With the recent collaboration of Universities and research labs, a new experiment test bed has been established. As a result, experiments can now be implemented on real networks. In our study, we design an experiment to analyze Distributed Denial of Service Attacks (DDoS Attack) on a real network with real Internet traffic. The approach that we use in our study can easily be generalized to apply to smart power grids. © 2011 ACM.