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Center for Applied Internet Data Analysis > publications : papers : 2016 : nat_revelio
NAT Revelio: Detecting NAT444 in the ISP
A. Lutu, M. Bagnulo, A. Dhamdhere, and k. claffy, "NAT Revelio: Detecting NAT444 in the ISP", in Passive and Active Network Measurement Workshop (PAM), Mar 2016.
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NAT Revelio: Detecting NAT444 in the ISP

Andra Lutu2
Marcelo Bagnulo2
Amogh Dhamdhere1
kc claffy1

CAIDA, San Diego Supercomputer Center, University of California San Diego


Simula Research Laboratory

In this paper, we propose NAT Revelio, a novel test suite and methodology for detecting NAT deployments beyond the home gateway, also known as NAT444 (e.g., Carrier Grade NAT). Since NAT444 solutions may impair performance for some users, understanding the extent of NAT444 deployment in the Internet is of interest to policymakers, ISPs, and users. We perform an initial validation of the NAT Revelio test suite within a controlled NAT444 trial environment involving operational residential lines managed by a large operator in the UK. We leverage access to a unique SamKnows deployment in the UK and collect information about the existence of NAT444 solutions from 2,000 homes and 26 ISPs. To demonstrate the flexibility of NAT Revelio, we also deployed it in project BISmark, an open platform for home broadband internet research. We analyze the results and discuss our findings.

Keywords: ipv6, measurement methodology
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