[153095] in North American Network Operators' Group
RE: Comcast Service for Non-Cap Bandwidth
daemon@ATHENA.MIT.EDU (Nabil Sharma)
Tue May 29 20:42:19 2012
From: Nabil Sharma <nabilsharma@hotmail.com>
To: <paul4004@gmail.com>, <jason_livingood@cable.comcast.com>
Date: Wed, 30 May 2012 00:41:43 +0000
In-Reply-To: <CAJAdsD=gQzqKcjx4D6vHBe3Ojm2SC876nf5ZGDtpzCTKAJwg5g@mail.gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
PC:
I also wish to know how much the Comcast "Paid Peering" service costs=2C an=
d if this is an option that can get us the delivery we require.
Could you please help me to understand why it is protected by NDA? Is there=
anyone on the NANOG list who can share this pricing with me in private?
Sincerely=2C
Nabil
Date: Tue=2C 29 May 2012 11:18:37 -0500
Subject: Re: Comcast Service for Non-Cap Bandwidth
From: paul4004@gmail.com
To: Jason_Livingood@cable.comcast.com
CC: nabilsharma@hotmail.com=3B nanog@nanog.org
Hi Nabil=2C
DSCP tagging on inter-domain internet traffic is not expected to work (I wo=
uldn't expect this to work at any ISP=2C quite frankly=2C absent some very =
special arrangements).
From reading the article in the link below=2C it sounds like they are using=
DSCP to ensure when a user has maxed their bandwidth allotment (say=2C dow=
nloading the latest WOW update)=2C that TV viewing is not disrupted. Inste=
ad of providing QOS on it to do this=2C it seems they provide you an includ=
ed-with-the-service additional bandwidth allotment/connection not related t=
o your internet connection=2C much how normal video is sent. In theory=2C =
this service could work if you cancelled your internet. In reality=2C it p=
robably won't. Many providers do the same for VOIP traffic if they have ph=
one services=2C etc (which do often work with no internet service).
I will say this -- I do telemetry data distribution which is nothing more t=
han a 1.5 megabit constant UDP stream (multicast anyone? I wish). The amo=
unt of traffic I push is roughly ~350gb/month per site. With hundreds of b=
usiness account sites on Comcast=2C Verizon=2C AT&T=2C cox=2C and others --=
The statistics don't lie. The Comcast network has the least packet loss o=
f the bunch by a wide margin in many cases=2C and in my opinion=2C is the m=
ost well built consumer broadband access network out there. With forward e=
rror correction=2C It's an extremely rare event that I see any requests for=
retransmission=2C generally isolated to maintenance activities.
My suggestion? Just send your data towards comcast from a Tier 1 ISP. Get=
it as close to your users (geographically) as you can=2C or use a CDN. Th=
en=2C I think you will be fine.
As for the connectivity=2C you might find it a good idea to explore the com=
cast paid peering/transit solution if comcast is your primary destination a=
nd packet delivery is critical. Heavy NDA requirements resulting in lack o=
f general pricing range input from the community every time the question ha=
s come up on NANOG has kept me from inquiring about paid peering. But I wi=
ll tell you just purchasing from the many transit providers who do publish =
pricing has not resulted in any problems or congestion=2C which is a good s=
ign.
On Tue=2C May 29=2C 2012 at 9:25 AM=2C Livingood=2C Jason <Jason_Livingood@=
cable.comcast.com> wrote:
Mail formatting issue with my mail client again=85 Note that the 1st paragr=
aph was quoted from Nabil...
>I generate http test stream with DSCP code point 5 to match the Xbox servi=
ce=2C
> however Comcast is rewriting the packets as CS 1=2C even when serving out=
a
> server at Soft Layer (paid peer). This is why I ask for name of service =
Microsoft
> is using=2C it is not the regular paid peering.
[JL] Yeah=2C that won't work but that marking is just for byte counting (wh=
ich per my other not does not really have any effect now anyway since the 2=
50GB policy was suspended. See also http://blog.comcast.com/2012/05/the-fac=
ts-about-xfinity-tv-and-xbox-360-comcast-is-not-prioritizing.html
For peering & interconnect=2C see:
http://www.comcast.com/peering/?SCRedirect=3Dtrue
http://www.comcast.com/dedicatedinternet/?SCRedirect=3Dtrue
Thanks
Jason
=
