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Re: Comcast/Level3 issues
From: Paul WALL <pauldotwall () gmail com>
Date: Mon, 6 Jan 2014 21:25:31 +0000


Thank you for the info.  Can you say how many quarters or years until
Comcast is resolved?

I've seen references to that obscure whitepaper (co-authored,
ironically, by Patrick Gilmore) before on the broadbandreports forums,
by someone with a lot of knowledge on Comcast's network and internal
politics/peering discussions.  Do you know who the poster is?


Drive Slow,

On Sun, Jan 5, 2014 at 6:17 PM, McElearney, Kevin
<Kevin_McElearney () cable comcast com> wrote:
FWIW, we work with each issue and try to fix them as best we can.  Several
are underway.  Much of the ³traffic shifting² is happening external to
Comcast with very large traffic swings congesting AND uncongesting paths.
The beauty of adaptive routing via CDN and text book ³Creating Incentives
to Peer² - feel free to google that...

        - Kevin

On 1/5/14, 1:22 AM, "Paul WALL" <pauldotwall () gmail com> wrote:

The people pushing this policy are not without a face and name.  They read
this mailing list, and attend our conferences.  You'll want to talk to
Schanz, Kevin McElearney, and Barry Tishgart.

Drive Slow (like a Comcast peering port),
Paul Wall

On Fri, Jan 3, 2014 at 10:55 AM, Scott Berkman <scott () sberkman net> wrote:

Comcast having saturated links to other providers is a common and
frequently discussed issue.  Here is one previous NANOG thread on the


And a related article:

There are debates back and forth on the validity of the graphs from the
NANOG post, but it is a fact that at that time Comcast was heavily
pre-pending their Level BGP advertisements to force traffic over to
and many many people noticed congestion at those links in a variety of

I wish you luck, but my personal opinion is that your fastest resolution
would be to move to another provider.  Comcast is a residential ISP that
lives on extreme over-subscription and not actually being able to
what customers believe they have. You'll notice a lot of recent news
increased and more strict data caps for their subscribers, and that is
only thing they will likely be doing to relieve these types of recurring


On 01/02/2014 11:18 PM, R W wrote:

I'm seeing the same as well. Can anyone from Comcast/Level(3) reach out
to me or provide comment. We're seeing heavy jitter and some packet
most noticeable in NYC area connections between Level(3) and Comcast.

 Date: Tue, 31 Dec 2013 09:45:00 -0800
Subject: Comcast/Level3 issues
From: dwheet () gmail com
To: nanog () nanog org

Looking for a networking contact at comcast and/or level3.  I've been
having some slow speed issues with hitting some sites that's going
level3 and I think there might be some congestion.


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