Matthew Sargent, Jakub Czyz, Mark Allman, Michael Bailey. On The Power and Limitations of Detecting Network Filtering via Passive Observation, Passive and Active Measurement Conference (PAM), March 2015.
PDF | Matt's Slides

Abstract:

Network operators often apply policy-based traffic filtering at the egress of edge networks. These policies can be detected by performing active measurements; however, doing so involves instrumenting every network one wishes to study. We investigate a methodology for detecting policy-based service-level traffic filtering from passive observation of traffic markers within darknets. Such markers represent traffic we expect to arrive and, therefore, whose absence is suggestive of network filtering. We study the approach with data from five large darknets over the course of one week. While we show the approach has utility to expose filtering in some cases, there are also limits to the methodology.

BibTeX:

@inproceedings{SCAB15,
    author    =        "Matt Sargent and Jakub Czyz and Mark Allman and Michael Bailey",
    title     =        "{On The Power and Limitations of Detecting Network Filtering via Passive Observation}",
    booktitle =        "Passive and Active Measurement Conference",
    year      =        2015,
    month     =        mar,
}