Our approach improves on these earlier techniques by leveraging network topology, along with measurements of network delay, to constrain host position. We motivate our work by showing that 1) existing approaches, based on end-to-end delay measurements from a set of landmarks, fail to outperform much simpler techniques, and 2) the error of these approaches is strongly determined by the distance to the nearest landmark, even when triangulation is used to combine estimates from different landmarks. We present Topology-based Geolocation (TBG), a novel approach to estimating the geographic location of arbitrary Internet hosts. Unfortunately, we find that some of the more prominent surveillance states (e.g., the U.S.) are also some of the least avoidable countries. Using the open DNS resolver infrastructure allows Kenyan clients to avoid the United States on 17\% more paths. We find that 84\% of paths originating in Brazil traverse the United States, but when relays are used for country avoidance, only 37\% of Brazilian paths traverse the United States. Then, we investigate how clients can use overlay network relays and the open DNS resolver infrastructure to prevent their traffic from traversing certain jurisdictions. We find that traffic is traversing known surveillance states, even when the traffic originates and ends in a country that does not conduct mass surveillance. By measuring the country-level paths to popular domains, we characterize transnational routing detours. We find that although many of these efforts are extensive, they are often futile, due to the inherent lack of hosting and route diversity for many popular sites. In some cases, countries are taking extreme steps, such as building new Internet Exchange Points (IXPs), which allow networks to interconnect directly, and encouraging local interconnection to keep local traffic local. In response, governments and citizens are increasingly paying attention to the countries that their Internet traffic traverses.
IP2LOCATION AND DBIP COMPRATION DRIVER
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