new talk “Verfploeter: Broad and Load-Aware Anycast Mapping”

Wes Hardaker gave the talk “Verfploeter: Broad and Load-Aware Anycast Mapping” at DNS-OARC in San Jose, California, USA on September 29, 2017.  Slides are available at on the event page.

From the abstract:

IP anycast provides DNS operators and CDNs with automatic fail-over and reduced latency by breaking the Internet into catchments,each served by a different anycast site. Unfortunately, understanding and predicting changes to catchments as sites are added or removed has been challenging. Current tools such as RIPE Atlas or commercial equivalents map from thousands of vantage points (VPs),but their coverage can be inconsistent around the globe. This paper proposes Verfploeter, a new method that maps anycast catchments using active probing. Verfploeter provides around 3.8M virtual VPs, 430 times the 9k physical VPs in RIPE Atlas,providing coverage of the vast majority of networks around the globe. We then add load information from prior service logs to provide calibrated predictions of anycast changes. Verfploeter has been used to evaluate the new anycast for B-Root, and we also report its use of a nine-site anycast testbed. We show that the greater coverage made possible by Verfploeter’s active probing is necessary to see routing differences in regions that have sparse coverage from RIPE Atlas, like South America and China.


A video of the talk is available On YouTube.

Announcements Collaborations Papers

best paper award at AINTEC 2016

Best paper award to Shah, Fontugne, and Papadopoulos at AINTEC 2016

Congratulations to Anant Shah, Christos Papadopoulos (Colorado State University) and Romain Fontugne (Internet Initiative Japan) for the award of  best paper at AINTEC 2016 to their paper “Towards Characterizing International Routing Detours”.

See our prior blog post for more information about the paper and its data, and the APNIC blog post about this paper.

Papers Publications

new conference paper “Towards Characterizing International Routing Detours” in AINTEC 2016

The paper “Towards Characterizing International Routing Detours” appeared in the 12th Asian Internet Engineering Conference on Dec 1, 2016 in Bangkok, Thailand and is available at The datasets are available at

From the abstract:

There are currently no requirements (technical or otherwise) that routing paths must be contained within national boundaries. Indeed, some paths experience international detours, i.e., originate in one country, cross international boundaries and return to the same country. In most cases these are sensible traffic engineering or peering decisions at ISPs that serve multiple countries. In some cases such detours may be suspicious. Characterizing international detours is useful to a number of players: (a) network engineers trying to diagnose persistent problems, (b) policy makers aiming at adhering to certain national communication policies, (c) entrepreneurs looking for opportunities to deploy new networks, or (d) privacy-conscious states trying to minimize the amount of internal communication traversing different jurisdictions.

In this paper we characterize international detours in the Internet during the month of January 2016. To detect detours we sample BGP RIBs every 8 hours from 461 RouteViews and RIPE RIS peers spanning 30 countries. We use geolocation of ASes which geolocates each BGP prefix announced by each AS, mapping its presence at IXPs and geolocation infrastructure IPs. Finally, we analyze each global BGP RIB entry looking for detours. Our analysis shows more than 5K unique BGP prefixes experienced a detour. 132 prefixes experienced more than 50% of the detours. We observe about 544K detours. Detours either last for a few days or persist the entire month. Out of all the detours, more than 90% were transient detours that lasted for 72 hours or less. We also show different countries experience different characteristics of detours.

This work won the Best Paper Award at AINTEC 2016. APNIC blog post on this paper can be found here.

The work in this paper is by Anant Shah, Christos Papadopoulos (Colorado State University) and Romain Fontugne (Internet Initiative Japan).