Multipath communications at the Internet scale have been a myth for a long time, with no actual protocol being deployed so that multiple paths could be taken by a same connection on the way towards an Internet destination. Recently, the Multipath Transport Control Protocol (MPTCP) extension was standardized and is undergoing a quick adoption in many use-cases, from mobile to fixed access networks, from data-centers to core networks. Among its major benefits -i.e., reliability thanks to backup path rerouting; throughput increase thanks to link aggregation; and confidentiality thanks to harder capacity to intercept a full connection -the latter has attracted lower attention. How interesting would it be using MPTCP to exploit multiple Internet-scale paths hence decreasing the probability of man-in-the-middle (MITM) attacks is a question to which we try to answer. By analyzing the Autonomous System (AS) level graph, we identify which countries and regions show a higher level of robustness against MITM AS-level attacks, for example due to core cable tapping or route hijacking practices.
In this paper, we study the second order statistics of traffic in an Internet backbone. We model the traffic at the flow level by a Poisson shot noise process. This model is quite parasimonious, and is driven only by variables that can be easily obtained from measurements, namely flow sizes, durations and arrival rate. We consider the auto-correlation of TCP traffic where the loss process of each TCP connection is assumed to be Poisson. Using a stochastic differential equation, we are able to provide an upper bound on the auto-covariance function of the aggregated TCP traffic whose tightness is shown by simulations with the network simulator-ns.
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