Packet delay and loss are two fundamental measures of performance. Using active probing to measure delay and loss typically involves sending Poisson probes, on the basis of the PASTA property (Poisson Arrivals See Time Averages), which ensures that Poisson probing yields unbiased estimates. Recent work, however, has questioned the utility of PASTA for probing and shown that, for delay measurements, a wide variety of processes other than Poisson can be used to probe with zero bias and Poisson probing does not necessarily minimize the variance of delay estimates. This paper, determines optimal probing processes that minimize the mean-square error of measurement estimates for both delay and loss.
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