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Submarine cables constitute the backbone of the Internet. However, thesecritical infrastructure components are vulnerable to several natural andman-made threats, and during failures, are difficult to repair in their remoteoceanic environments. In spite of their crucial role, we have a limitedunderstanding of the impact of submarine cable failures on global connectivity,particularly on the higher layers of the Internet.  In this paper, we present Nautilus, a framework for cross-layer cartographyof submarine cables and IP links. Using a corpus of public datasets andInternet cartographic techniques, Nautilus identifies IP links that are likelytraversing submarine cables and maps them to one or more potential cables.Nautilus also gives each IP to cable assignment a prediction score thatreflects the confidence in the mapping. Nautilus generates a mapping for 3.05million and 1.43 million IPv4 and IPv6 links respectively, covering 91% of allactive cables. In the absence of ground truth data, we validate Nautilusmapping using three techniques: analyzing past cable failures, using targetedtraceroute measurements, and comparing with public network maps of twooperators.

Nautilus: A Framework for Cross-Layer Cartography of Submarine Cables and IP Links