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In-band Network Telemetry (INT) and sketching algorithms are two promisingdirections for measuring network traffics in real time. To combine sketch withINT and preserve their advantages, a representative approach is to use INT tosend a switch sketch in small pieces (called sketchlets) to end-host forreconstructing an identical sketch. However, in this paper, we reveal that whennaively selecting buckets to sketchlets, the end-host reconstructed sketch isinaccurate. To overcome this problem, we present DUNE, an innovative sketch-INTnetwork measurement system. DUNE incorporates two key innovations: First, wedesign a novel scatter sketchlet that is more efficient in transferringmeasurement data by allowing a switch to select individual buckets to add tosketchlets; Second, we propose lightweight data structures for tracing"freshness" of the sketch buckets, and present algorithms for smartly selectingbuckets that contain valuable measurement data to send to end-host. Wetheoretically prove the effectiveness of our proposed methods, and implement aprototype on commodity programmable switch. The results of extensiveexperiments driven by real-world traffics on DUNE suggest that our proposedsystem can substantially improve the measurement accuracy at a trivial cost.

DUNE: Improving Accuracy for Sketch-INT Network Measurement Systems