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We propose a method, called PathQuick2, for quickly and simultaneously estimating both of the available bandwidth that is unused capacity of an end-to-end path and the effective UDP throughput that is the receiving rate of an UDP flow which can pass through the path, with a single measurement. In PathQuick2, a sender transmits a probing packet train (i.e., a set of multiple probing packets) that each packet is placed at an equal time interval, and each packet size increases as the packet sequence proceeds. A receiver produces the estimated available bandwidth and the estimated effective UDP throughput at the same time from the single packet train. To this end, the receiver detects a packet at which the observed time intervals begin increasing, and the per-packet receiving rate becomes the estimated available bandwidth. Then, the receiver detects a packet at which the observed per-packet receiving rates stop …