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2016 | OriginalPaper | Buchkapitel

NAT Revelio: Detecting NAT444 in the ISP

verfasst von : Andra Lutu, Marcelo Bagnulo, Amogh Dhamdhere, K. C. Claffy

Erschienen in: Passive and Active Measurement

Verlag: Springer International Publishing

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Abstract

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.

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Fußnoten
1
A common configuration is to assign private or shared address space only to the interface of the Service Demarcation point attached to the ISP network, while other elements of the ISP network use public addresses.
 
2
Attempting to validate our findings, we have contacted all the 5 ISPs, but we have yet to receive a reply from 4 of them.
 
3
Attempting to validate this result, we found that several subscribers reported on the ISP’s online customer support forum that they had identified the presence of the CGN by detecting the presence of shared address space in the ISP.
 
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Metadaten
Titel
NAT Revelio: Detecting NAT444 in the ISP
verfasst von
Andra Lutu
Marcelo Bagnulo
Amogh Dhamdhere
K. C. Claffy
Copyright-Jahr
2016
DOI
https://doi.org/10.1007/978-3-319-30505-9_12

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