No abstract

Traceroute is a popular network diagnostic tool used for discovering the Internet path towards a target host. Besides network diagnostic, in the last years traceroute has been used by researchers to discover the topology of the Internet. Some network administrators, however, congure their networks to not reply to traceroute probes or to block them (e.g. by using rewalls), preventing traceroute from providing details about the internal structure of their networks. In this paper we present camouage traceroute (camotrace), a traceroute-like tool aimed at discovering Internet paths even when standard traceroute is blocked. To this purpose, camotrace mimics the behavior of a popular TCP-based application-level protocol. We show preliminary results that conrm that camotrace is able to obtain additional information compared to standard traceroute.

Cyber-Physical Systems are more and more employed to implement smart environments also in safety-critical scenarios. We here propose a novel system-level design approach capable at considering two relevant aspects of such systems: i) elaborations together with sensing and actuation need to be placed in the zones where cyber-physical interactions take place, and ii) fault tolerance mechanisms have to be incorporated to tolerate device failures. The proposed design approach identifies the optimal instantiation of the system architecture and deployment of the applications to minimize the monetary cost of the solution while guaranteeing resource requirements and fault tolerance. Experimental results show that the proposed approach reduces up to 20% the solution cost w.r.t. a straightforward hardening baseline with a computationally viable execution time.