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TCP has provided the primary means to transfer data reliably across the Internet; however, TCP has imposed limitations on several applications. Measurement and estimation of packet loss characteristics are challenging due to the relatively rare occurrence and typically short duration of packet loss episodes. While active probe tools are commonly used to measure packet loss on end-to-end paths, there has been little analysis of the accuracy of these tools or their impact on the network. The main objective is to understand the problem of detecting whether a compromised router is maliciously manipulating its stream of packets. In particular to this concern a simple yet effective attack in which a router selectively drops packets destined for some Victim.
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