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Analysis of country-wide internet outages caused by censorship
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2014 (English)In: IEEE/ACM Transactions on Networking, ISSN 1063-6692, E-ISSN 1558-2566, Vol. 22, no 6, p. 1964-1977, article id 6678649Article in journal (Refereed) Published
Abstract [en]

In the first months of 2011, Internet communications were disrupted in several North African countries in response to civilian protests and threats of civil war. In this paper, we analyze episodes of these disruptions in two countries: Egypt and Libya. Our analysis relies on multiple sources of large-scale data already available to academic researchers: BGP interdomain routing control plane data, unsolicited data plane traffic to unassigned address space, active macroscopic traceroute measurements, RIR delegation files, and MaxMind's geolocation database. We used the latter two data sets to determine which IP address ranges were allocated to entities within each country, and then mapped these IP addresses of interest to BGP-announced address ranges (prefixes) and origin autonomous systems (ASs) using publicly available BGP data repositories in the US and Europe. We then analyzed observable activity related to these sets of prefixes and ASs throughout the censorship episodes. Using both control plane and data plane data sets in combination allowed us to narrow down which forms of Internet access disruption were implemented in a given region over time. Among other insights, we detected what we believe were Libya's attempts to test firewall-based blocking before they executed more aggressive BGP-based disconnection. Our methodology could be used, and automated, to detect outages or similar macroscopically disruptive events in other geographic or topological regions.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2014. Vol. 22, no 6, p. 1964-1977, article id 6678649
Keywords [en]
Censorship, connectivity disruption, darknet, Internet background radiation, network telescope, outages
National Category
Communication Systems Computer Sciences
Identifiers
URN: urn:nbn:se:kth:diva-222329DOI: 10.1109/TNET.2013.2291244ISI: 000346796000021Scopus ID: 2-s2.0-84919698373OAI: oai:DiVA.org:kth-222329DiVA, id: diva2:1180765
Note

QC 20180207

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf