Two Samples are Enough: Opportunistic Flow-level Latency Estimation Using NetFlow

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Executive Summary

The inherent support in routers (SNMP counters or NetFlow) is not sufficient to diagnose performance problems in IP networks, especially for flow-specific problems where the aggregate behavior within a router appears normal. To address this problem, in this paper, the authors propose a Consistent NetFlow (CNF) architecture for measuring per-flow performance measurements within routers. CNF utilizes existing NetFlow architecture that already reports the first and last timestamps per-flow, and proposes hash-based sampling to ensure that two adjacent routers record the same flows.

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