Comcast and Verizon Lowered Speed to Cogent below 0.5Mbps

/ 2 years ago

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New detailed measurements have been released displaying exactly how much throttling of traffic was done by major US ISP’s Comcast and Verizon through to Cogent – a backbone operator of Netflix traffic. As almost everyone in the United States discovered over the span of the last year, traffic through to Netflix got bad – really flipping bad. A new study released by M-Lab data has a detailed analysis of just how terrible the throttling from both Verizon, Time Warner and Comcast made it for traffic passing through to Cogent. The study reveals a detailed insight into traffic through the ISP’s over the span of a 5 year period, of which between late May through to February of this year – traffic trickled down to a ludicrously slow 0.5mbps speed. It’s no wonder Netflix was failing to stream for most US citizens.


“Using Measurement Lab (M-Lab) data, and constraining our research to the United States, we observed sustained performance degradation experienced by customers of Access ISPs AT&T, Comcast, CenturyLink, Time Warner Cable, and Verizon when their traffic passed over interconnections with Transit ISPs Cogent Communications (Cogent), Level 3 Communications (Level 3), and XO Communications (XO),” researchers wrote. “In a large number of cases we observed similar patterns of performance degradation whenever and wherever specific pairs of Access/Transit ISPs interconnected. From this we conclude that ISP interconnection has a substantial impact on consumer internet performance—sometimes a severely negative impact—and that business relationships between ISPs, and not major technical problems, are at the root of the problems we observed.”

“The three degraded Access ISPs [Comcast, Time Warner Cable, and Verizon] failed to achieve median download throughputs above 4Mbps when connecting over Cogent in New York City for most of the period between Spring 2013 and March 2014,” M-Lab wrote. “While daily median download throughput overall hovered around 4Mbps, performance degradation was much worse during peak use hours. For much of the time between Spring 2013 and March 2014, download speeds during peak use hours remained well below 4Mbps. By January 2014, the download throughput rate during peak use hours for Comcast and Verizon traffic over Cogent’s network was less than 0.5Mbps, the minimum rate necessary for web browsing and email according to the FCC. Note that only between 2:00 AM and 1:00 PM were the three affected Access ISPs able to attain speeds above 4 Mbps across the Transit ISP Cogent.”

The full dataset of information from M-Lab has been published online, and is available for viewing here. One thing is for certain after going through the findings – the internet is in for a bumpy ride if strong net neutrality laws and regulation checks aren’t brought into place. The wild west could start to get a lot wilder.

Thanks to M-Lab for providing us with this information.

Image courtesy of Slate.

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