Month: April 2013

Categories
Papers Publications

New conference paper “Evaluating Anycast in the Domain Name System” to appear at INFOCOM

The paper “Evaluating Anycast in the Domain Name System” (available at http://www.isi.edu/~xunfan/research/Fan13a.pdf) was accepted to appear at the IEEE International Conference (INFOCOM) on Computer Communications 2013 in Turin, Italy.

Fan13a_icon
Recall as number of vantage points vary. [Fan13a, figure 2]
From the abstract:

IP anycast is a central part of production DNS. While prior work has explored proximity, affinity and load balancing for some anycast services, there has been little attention to third-party discovery and enumeration of components of an anycast service. Enumeration can reveal abnormal service configurations, benign masquerading or hostile hijacking of anycast services, and help characterize anycast deployment. In this paper, we discuss two methods to identify and characterize anycast nodes. The first uses an existing anycast diagnosis method based on CHAOS-class DNS records but augments it with traceroute to resolve ambiguities. The second proposes Internet-class DNS records which permit accurate discovery through the use of existing recursive DNS infrastructure. We validate these two methods against three widely-used anycast DNS services, using a very large number (60k and 300k) of vantage points, and show that they can provide excellent precision and recall. Finally, we use these methods to evaluate anycast deployments in top-level domains (TLDs), and find one case where a third-party operates a server masquerading as a root DNS anycast node as well as a noticeable proportion of unusual DNS proxies. We also show that, across all TLDs, up to 72% use anycast.

Citation: Xun Fan, John Heidemann and Ramesh Govindan. Evaluating Anycast in the Domain Name System. To appear in Proceedings of the IEEE International Conference on Computer Communications (INFOCOM). Turin, Italy. April, 2013. http://www.isi.edu/~johnh/PAPERS/Fan13a.html

Categories
Announcements Data

Complete IPv4 geolocation dataset now available

complete_geoloc_map

We recently finished the work of geolocating all IPv4 addresses and plotted a “complete IP geolocation map“.

This work is based on our previous IMC paper “Towards Geolocation of Millions of IP Addresses“, joint work of Zi Hu, John Heidemann, and Yuri Pradkin.

Processed data from this work is visible on our browsable web map.  The raw data from this effort is available through PREDICT or from the authors.

Categories
Presentations

New Poster “Poster Abstract: Towards Active Measurements of Edge Network Outages” in PAM 2013

Lin Quan presented our outage work: “Poster Abstract: Towards Active Measurements of Edge Network Outages” at the PAM 2013 conference. Poster abstract is available at http://www.isi.edu/~johnh/PAPERS/Quan13a/index.html

pam_poster

End-to-end reachability is a fundamental service of the Internet. We study network outages caused by natural disasters, and political upheavals. We propose a new approach to outage detection using active probing. Like prior outage detection methods, our method uses ICMP echo requests (“pings”) to detect outages, but we probe with greater density and ner granularity, showing pings can detect outages without supplemental probing. The main contribution of our work is to de ne how to interpret pings as outages: defi ning an outage as a sharp change in block responsiveness relative to recent behavior. We also provide preliminary analysis of outage rate in the Internet edge. Space constrains this poster abstract to only sketches of our approach; details and validation are in our technical report. Our data is available at no charge, see http://www.isi.edu/ant/traces/internet_outages/.

This work is based on our technical report: http://www.isi.edu/~johnh/PAPERS/Quan12a/index.html, joint work by Lin Quan, John Heidemann and Yuri Pradkin.