Issue No.05 - September/October (2004 vol.8)
Paul Barford , University of Wisconsin at Madison
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/MIC.2004.34
Empirical analysis of Internet traffic characteristics should not be biased by the measurement methodology used to gather data. This article compares probe- (active) and router-based (passive) methods for measuring packet loss both in the laboratory and in a wide-area network. The laboratory case study demonstrates the accuracy of passive Simple Network Measurement Protocol (SNMP) measurements at low loss rates; the wide-area experiments show that active-probe loss-rate measurements don't correlate with those measured by SNMP from routers in a live network. This case study's findings also reveal that common methods for active probing for packet loss suffer from high variance and from the effects of end-host interface loss.
Internet, packet loss, probe, router
Paul Barford, "Comparing Probe- and Router-Based Packet-Loss Measurement", IEEE Internet Computing, vol.8, no. 5, pp. 50-56, September/October 2004, doi:10.1109/MIC.2004.34