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The TCP Extended Statistics MIB Use TCP’s ideal diagnostic vantage point Observe what the path is doing to segments Observe what the application is doing to TCP TCP already measures many path properties RTT, RTT variance, MTU, window size Easily instrumented to measure other properties Reordering, loss rate, congestion signals Instrument why tcp_output() stops sending Receiver window, congestion window or the sender? Per-connection controls to support workarounds |