nanog mailing list archives
Re: Some truth about Comcast - WikiLeaks style
From: Lamar Owen <lowen () pari edu>
Date: Tue, 21 Dec 2010 13:33:47 -0500
On Tuesday, December 21, 2010 11:26:48 am Rettke, Brian wrote:
The problem is probably not the connection speed, but congestion on the CMTS. If the downstream is saturated (too many people watching Netflix on a node) the available shared bandwidth may not be enough to support your real-time traffic. Which is a pretty good archetype for the discussion anyhow.
Well, at the time we did this test NetFlix was still just a DVD by mail outfit; this has been a couple or three years ago. Congestion == oversubscribed. I would love to see a public posting or notice or something on my ISP's website showing current flows and congestion (the Cacti driven Network Weathermap is one such tool I've seen networks use; one of my providers used to have one publicly available, and it was very useful). Would make it much easier to make informed decisions on my part. But this CMTS subscriber wanting to do medium-low bandwidth H.323 never had trouble seeing our stream to him; that was the funny thing. It was always the return stream from him to us that broke up. And it didn't act like congestion; it acted like some sort of filter in place that would only allow the full upstream briefly, and then would die for some period of time, and then would allow another burst of traffic. (I've received one private reply mentioning a possible technology to do this....) Many if not virtually all residential broadband subscribers are under the impression that they really get the full use of the advertised bandwidth; it is a shock to most when they learn about oversubscription practices and QoS congestion management.
Current thread:
- RE: Some truth about Comcast - WikiLeaks style, (continued)
- RE: Some truth about Comcast - WikiLeaks style George Bonser (Dec 19)
- Re: Some truth about Comcast - WikiLeaks style Jeff Wheeler (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Bret Clark (Dec 20)
- RE: Some truth about Comcast - WikiLeaks style George Bonser (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Owen DeLong (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Lamar Owen (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Jack Bates (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Owen DeLong (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Lamar Owen (Dec 21)
- RE: Some truth about Comcast - WikiLeaks style Rettke, Brian (Dec 21)
- Re: Some truth about Comcast - WikiLeaks style Lamar Owen (Dec 21)
- RE: Some truth about Comcast - WikiLeaks style Rettke, Brian (Dec 21)
- Re: Some truth about Comcast - WikiLeaks style Pete Carah (Dec 21)
- Re: Some truth about Comcast - WikiLeaks style Michael DeMan (Dec 20)
- Re: Some truth about Comcast - WikiLeaks style Leo Bicknell (Dec 19)
- Re: Some truth about Comcast - WikiLeaks style Richard A Steenbergen (Dec 19)
- Re: Some truth about Comcast - WikiLeaks style Owen DeLong (Dec 19)
- RE: Some truth about Comcast - WikiLeaks style George Bonser (Dec 19)
- Re: Some truth about Comcast - WikiLeaks style Matthew Petach (Dec 19)
- Re: Some truth about Comcast - WikiLeaks style Jay Ashworth (Dec 23)
- RE: Some truth about Comcast - WikiLeaks style George Bonser (Dec 19)