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Denial of Service (DoS) attacks represent, in today's Internet, one of the most complex issues to address. This paper presents a novel approach to deal with Distributed DoS (DDoS) attacks in the Internet. The paper proposes a model for an Active Security System, comprising a number of components that actively cooperate in order to effectively react to a wide range of attacks. Functional to one's approach is a network signaling protocol, named Active Security Protocol, which allows a set of active routers to interact in order to isolate the sources of a DDoS attack even in the case of address spoofing. Deployment and tuning of the Active Security System are ideally suited to a Programmable Network environment.
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