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Comparing probe-and router-based packet-loss measurement

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2 Author(s)
Barford, P. ; Dept. of Comput. Sci., Wisconsin Univ., Madison, WI, USA ; Sommers, J.

Empirical analysis of Internet traffic characteristics should not be biased by the measurement methodology used to gather data. We compare 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.

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Internet Computing, IEEE  (Volume:8 ,  Issue: 5 )