Two researchers at Georgia Tech can tell you exactly how American ISPs shape Internet traffic, and which ones do so. Bottom line: of the five largest Internet providers in the country, the three cable companies (Comcast, Time Warner, Cox) employ shaping while the telephone companies (AT&T, Verizon) do not—though that fact is less significant for the user experience than it might first sound.
Partha Kanuparthy and Constantine Dovrolis wanted to measure Internet shaping, so they built a tool called ShaperProbe to do so. The tool relies on users from around the country running tests in which the user's computer transmits data at a constant bit rate, while ShaperProbe's 48 Linux-based server instances watch incoming traffic to see if that rate degrades in predictable ways over time. Using the M-Lab infrastructure, ShaperProbe has collected more than 1 million trial runs from 5,700 ISPs over the last two years.
The resulting paper (PDF) documents the first accurate attempt to “measure traffic shaping deployments on the Internet.”
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