[173564] in North American Network Operators' Group
Re: Richard Bennett, NANOG posting, and Integrity
daemon@ATHENA.MIT.EDU (Bill Woodcock)
Mon Jul 28 13:03:59 2014
X-Original-To: nanog@nanog.org
From: Bill Woodcock <woody@pch.net>
Date: Mon, 28 Jul 2014 10:03:47 -0700
To: NANOG <nanog@nanog.org>
In-Reply-To: <1224072.7357.1406566327449.JavaMail.root@benjamin.baylink.com>
Errors-To: nanog-bounces@nanog.org
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On Jul 28, 2014, at 9:52 AM, Jay Ashworth <jra@baylink.com> wrote:
>>> It is not representative of the actual traffic flows on the =
Internet.
>>=20
>> Traffic flows on the Internet is a different survey of a different =
thing.
>=20
> He didn't mean "TCP Flows", I don't think; he was simply -- as I=20
> understood him -- talking about the 40,000ft view of connections =
between
> pieces of the Internet. I don't expect your dataset to have flow-level =
data, and I don't think
> he did either.
How else do you get a representative measurement of =93actual traffic =
flows on the Internet?=94
We=92ve got adjacency information. Telegeography has hand-waving 40,000 =
ft. flow estimates in the form of different widths of arrows on a map. =
But if you want to know how large actual flows of data are between two =
regions of the Internet, and you can=92t actually instrument the whole =
Internet, you need two things: (1) a broad and representative sampling =
of flow data, and (2) a complete measurement of a few portions of the =
network that are represented in the sampled set. That gives you a =
horizontal and a vertical view, from which you can extrapolate to a =
whole, or any other part, with some minor assurance of reasonability.
If someone has an easier methodology to suggest, that still produces =
usable results, I=92m all ears.
> it isn't really germane to the conversation we're having.
I thought I=92d made that point?
-Bill
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