Tuesday, March 6, 2018 [Tweets] [Favorites]

The Mystery of the Slow Downloads

Cabel Sasser:

Our downloads really were slow — but seemingly only to Comcast users, and only during peak internet usage times. Something was up. At first we thought, maybe Comcast bandwidth is just naturally more congested in the evening as people come home from work and begin streaming Netflix, etc. But that didn’t explain why the connections to our Linode control server from Comcast, during the exact same time windows for each tester, were downloading with good speeds. We wondered, is Comcast intentionally “throttling” Cogent customers? And if so, why?


It felt like there was no way this should have worked. If I had to guess, I’d say it’s simple: in the middle of a serious ongoing debate over net neutrality, the last thing Comcast wanted to look like was a network-throttling bad guy in this blog post. But then again, maybe I’m still being too cynical — maybe they just saw a problem they hadn’t noticed and fixed it. (But really, did they really not notice that pipe was full until I asked? Surely there are network monitoring tools?) Frankly, I have to stop thinking about it, because I’ll never know. But no matter the reason, I’m very grateful: thanks for listening to us, Comcast.)


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