Tilmans, O; Bühler, T; Poese, I; Vissicchio, S; Vanbever, L; (2018) Stroboscope: Declarative Network Monitoring on a Budget. In: Banerjee, S and Seshan, S, (eds.) Proceedings of 15th USENIX Symposium on Networked Systems Design and Implementation - 2018. (pp. pp. 467-482). USENIX Association: Renton, WA.

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Abstract

For an Internet Service Provider (ISP), getting an accurate picture of how its network behaves is challenging. Indeed, given the carried traffic volume and the impossibility to control end-hosts, ISPs often have no other choice but to rely on heavily sampled traffic statistics, which provide them with coarse-grained visibility at a less than ideal time resolution (seconds or minutes). We present Stroboscope, a system that enables finegrained monitoring of any traffic flow by instructing routers to mirror millisecond-long traffic slices in a programmatic way. Stroboscope takes as input high-level monitoring queries together with a budget and automatically determines: (i) which flows to mirror; (ii) where to place mirroring rules, using fast and provably correct algorithms; and (iii) when to schedule these rules to maximize coverage while meeting the input budget. We implemented Stroboscope, and show that it scales well: it computes schedules for large networks and query sizes in few seconds, and produces a number of mirroring rules well within the limits of current routers. We also show that Stroboscope works on existing routers and is therefore immediately deployable.

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