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Re: [tsvwg] Your NQB presentation

Greg White <g.white@CableLabs.com> Fri, 22 November 2019 03:18 UTC

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From: Greg White <g.white@CableLabs.com>
To: Michael Welzl <michawe@ifi.uio.no>, tsvwg IETF list <tsvwg@ietf.org>
Thread-Topic: [tsvwg] Your NQB presentation
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Date: Fri, 22 Nov 2019 03:18:21 +0000
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Subject: Re: [tsvwg] Your NQB presentation
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Hi Michael,

Thanks for sending the reference.  I only scanned it, but on first blush I don’t think this study reports on the situation that we’re discussing.  I likely missed it, so if you think I’m wrong, could you point out where in the data it is reported?

To be clear, I think the specific situation we’re talking about is where a residential ISP allows DSCPs marked by 3rd parties to be delivered intact to their residential customers.  How many of the 39 “Home Network” nodes in that data set received DSCP marked traffic that had passed through an interconnect?

-Greg


From: tsvwg <tsvwg-bounces@ietf.org> on behalf of Michael Welzl <michawe@ifi.uio.no>
Date: Friday, November 22, 2019 at 10:38 AM
To: tsvwg IETF list <tsvwg@ietf.org>
Subject: Re: [tsvwg] Your NQB presentation

Just as a data point,

I think we share the belief that the vast majority (all?) residential ISPs currently bleach ALL DSCPs to default for their residential customers, and so the 0x2A value will already be handled in the same manner, but these requirements and the (to be written) informative text will help ensure operators only deviate from that default state consciously.

“all?” / ALL would contradict with at least one measurement study. See:
https://www.sciencedirect.com/science/article/pii/S0166531619300203
(where at least the ARK nodes count as “residential”), and references therein.

Cheers,
Michael

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