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A Multi-perspective Analysis of Carrier-Grade NAT Deployment

Richter, Philipp and Wohlfart, Florian and Vallina-Rodriguez, Narseo and Allman, Mark and Bush, Randy and Feldmann, Anja and Kreibich, Christian and Weaver, Nicholas and Paxson, Vern (2016) A Multi-perspective Analysis of Carrier-Grade NAT Deployment. In: The 16th ACM Internet Measurement Conference 2016 (ACM IMC 2016), 14-16 November 2016, Santa Monica, CA, USA.

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Abstract

As ISPs face IPv4 address scarcity they increasingly turn to network address translation (NAT) to accommodate the address needs of their customers. Recently, ISPs have moved beyond employing NATs only directly at individual customers and instead begun deploying Carrier-Grade NATs (CGNs) to apply address translation to many independent and disparate endpoints spanning physical locations, a phenomenon that so far has received little in the way of empirical assessment. In this work we present a broad and systematic study of the deployment and behavior of these middleboxes. We develop a methodology to detect the existence of hosts behind CGNs by extracting non-routable IP addresses from peer lists we obtain by crawling the BitTorrent DHT. We complement this approach with improvements to our Netalyzr troubleshooting service, enabling us to determine a range of indicators of CGN presence as well as detailed insights into key properties of CGNs. Combining the two data sources we illustrate the scope of CGN deployment on today's Internet, and report on characteristics of commonly deployed CGNs and their effect on end users.

Item Type: Conference or Workshop Papers (Paper)
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Narseo Vallina
Date Deposited: 25 Jan 2017 14:03
Last Modified: 25 Jan 2017 14:03
URI: http://eprints.networks.imdea.org/id/eprint/1506

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