Where are the anycasters

Speaker : Danilo Cicalese
Telecom Paristech
Date: 20/04/2016
Time: 2:00 pm - 3:00 pm
Location: LINCS Meeting Room 40


Use of anycast IP addresses has increased in the last few years: once relegated to DNS root and top-level domain servers, anycast is now commonly used to assist distribution of general purpose content by CDN providers. Yet, most anycast discovery methodologies rely so far on DNS, which limits their usefulness to this particular service. This raises the need for protocol agnostic methodologies, that should additionally be as lightweight as possible in order to scale up anycast service discovery.Our anycast discovery method allows for exhaustive and accurate enumeration and city-level geolocation of anycast replicas, with the constraints of only leverages a handful of latency measurements from a set of known probes. The method exploits an iterative workflow to enumerate (optimization problem) and geolocate (classification problem) anycast instances. The method is so lightweight and protocol agnostic that we were able to perform several censuses of the whole IPv4 Internet, recollecting all anycast deployments. Finally, we carry on a passive study of anycast traffic to refine the picture of services currently served over IP anycast. All our code, dataset and further information are available athttp://www.enst.fr/~drossi/anycast