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Routing policies used in the Internet can be restrictive, limitingcommunication between source-destination pairs to one path, when often betteralternatives exist. To avoid route flapping, recovery mechanisms may bedampened, making adaptation slow. Unstructured overlays have been proposed tomitigate the issues of path and performance failures in the Internet by routingthrough an indirect-path via overlay peer(s). Choosing alternate-paths inoverlay networks is a challenging issue. Ensuring both availability andperformance guarantees on alternate paths requires aggressive monitoring of alloverlay paths using active probing; this limits scalability. An alternatetechnique to select an overlay-path is to bias its selection based on physicaldisjointness criteria to bypass the failure on the primary-path. Recently,several techniques have emerged which can optimize the selection of adisjoint-path without incurring the high costs associated with probing paths.In this paper, we show that using only commodity approaches, i.e. runninginfrequent traceroutes between overlay hosts, a lot of information can berevealed about the underlying physical path diversity in the overlay networkwhich can be used to make informed-guesses for alternate-path selection. Wetest our approach using datasets between real-world hosts in AMP and RIPEnetworks.

Disjoint-Path Selection in Internet: What traceroutes tell us?