Title: How Cloud Traffic Goes Hiding - A Study of Amazon’s Interconnection Fabric
Speaker: Reza Rejaie (University of Oregon)
The growing demand for an ever-increasing number of cloud services is transforming the Internet’s interconnection ecosystem in profound ways. One indication of this transformation has been the emergence of “virtual private interconnections (VPIs)”, a new interconnection service offering specifically designed for small- or medium-sized enterprises that typically lack an autonomous system number (ASN) but are interested in establishing direct connectivity to one or more cloud providers to reap the benefits of today’s cloud services. However, VPIs are not publicly visible and traffic traversing them remains largely hidden as it bypasses the public Internet. In particular, existing techniques for inferring Internet interconnections are unable to detect VPIs and are also incapable of mapping them to the physical facility or geographic region where they are established.
In this talk, we present a third-party measurement study aimed at revealing the interconnections between Amazon (i.e., AS16509) and the US portion of the Internet. We describe our technique for inferring these interconnections and pay special attention to inferring VPIs associated with this largest cloud provider. We find that among the roughly 13,000 discovered interconnections for Amazon, at least 3,000 (and very likely many more) of them are VPIs which attests to their growing popularity with enterprises. We further classify the inferred Amazon interconnections based on their visibility in BGP, public or private type, and physical or virtual nature of private interconnections. We then explore whether each class of interconnection is utilised by certain type of neighbouring ASes to exchange traffic with Amazon. Finally, we present our technique for pinning (i.e. geo-locating) each end of the inferred Amazon interconnections to different metro areas.
This is joint work with Bahador Yeganeh, Ramakrishnan Durairajan (University of Oregon) and Walter Willinger (NIKSUN, Inc.)