Comcast/Level3 issues

Paul WALL pauldotwall at
Mon Jan 6 21:25:31 UTC 2014


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 at> 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 at> 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 at> 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:
>>> Concerning-Congested-Comcast-TATA-Links-111818
>>> 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
>>> markets.
>>> 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
>>> issues.
>>>   -Scott
>>> 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.
>>>> -Rob
>>>>  Date: Tue, 31 Dec 2013 09:45:00 -0800
>>>>> Subject: Comcast/Level3 issues
>>>>> From: dwheet at
>>>>> To: nanog at
>>>>> 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
>>>>> through
>>>>> level3 and I think there might be some congestion.
>>>>> Doug

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