The network layer operations in ad hoc networks -namely packet routing and forwarding -are solely performed by the nodes themselves and consequently rely on the cooperation among them. In such networks, to best manage packet forwarding to the aimed destination node raises a need for continuous monitoring of the network service that is likely to be obtained from the other node cooperation. In this paper, we survey reputation mechanisms based on forwarding monitoring in ad hoc networks and we identify and analyze the relevant issues concerning the evaluation of forwarding operations. Finally, we highlight the need for transposing these results to hybrid ad hoc networks, with the aim to monitor the availability of the Internet access.
Abstract. Active Networking is an innovative technology which can open the network and make it more flexible. But introducing active codes within the network increases the network vulnerability from the security point of view. The security is always considered as a separated layer from the other layers of the active network architecture. In this paper, we develop a global security architecture for a safe code distribution. A three level mechanism is defined to provide a unique identification, authentication, and classification of a code, according to its developer and its users.
Nous étudions l'impact de l'introduction de la gestion active dans un réseau sur les paquets traditionnels traversant les noeuds actifs le constituant. Dans le cadre de l'infrastructure ARFANet, deux configurations de l'architecture d'un noeud actif sont considérées. Dans chaque cas, nous comparons les performances du noeud actif à celles d'un noeud traditionnel en utilisant le formalisme d'algèbre des processus PEPA. Nous nous intéressons, en particuliers, à des mesures de performance telles que les taux de perte des paquets standards et la latence du noeud pour ce même type de paquets. ABSTRACT. We investigate the impact of introducing active networking on traditional packets flowing through the active nodes of a network. In the context of the ARFANet infrastructure, we consider two configurations of the active node architecture. For each configuration, we compare the performance of an active node and of a traditional one, using the process algebra formalism PEPA. We are mainly interested in performance measures such as loss rates of standard packets and the node latency for this kind of packets.
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