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Re: [tsvwg] FQ & VPNs

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Sun, 21 February 2021 21:23 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Jonathan Morton <chromatix99@gmail.com>
CC: Tom Henderson <tomh@tomh.org>, Dave Taht <dave.taht@gmail.com>, TSVWG <tsvwg@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [tsvwg] FQ & VPNs
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Date: Sun, 21 Feb 2021 21:23:24 +0000
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Subject: Re: [tsvwg] FQ & VPNs
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Hi Jonathan

Help me to understand this right. 

You argue that Tom's suggestion is not possible because it requires that the
group agrees to start an L4S experiment that stipulates an alternate
interpretation for the ECT(1) codepoint (as per RFC8311). 
And further you point at the problem that RFC3168 AQMs cannot distinguish
between ECT(0) and ECT(1) as evidence that the L4S experiment cannot be
(safely) run, and consequently the L4S experiment should not run.

Do I understand right?, I am really confused. It all sounds like a catch-22
situation to me ?

/Ingemar 

> -----Original Message-----
> From: Jonathan Morton <chromatix99@gmail.com>
> Sent: den 21 februari 2021 20:32
> To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
> Cc: Tom Henderson <tomh@tomh.org>; Dave Taht <dave.taht@gmail.com>;
> TSVWG <tsvwg@ietf.org>
> Subject: Re: [tsvwg] FQ & VPNs
> 
> > On 21 Feb, 2021, at 9:24 pm, Ingemar Johansson S
> <ingemar.s.johansson@ericsson.com> wrote:
> >
> > Please read
> > https://tools.ietf.org/html/rfc8311
> 
> Yes, I did.  And what it actually says is:
> 
> > This memo updates RFC 3168 to allow routers to treat the ECT(0) and
> > ECT(1) codepoints differently, provided that the changes from RFC 3168
are
> documented in an Experimental RFC in the IETF document stream.  The
> specific change to RFC 3168 is to insert the words "unless otherwise
specified
> by an Experimental RFC in the IETF document stream" at the end of the
> above sentence.
> 
> Which is pretty much equivalent to what I just said to Tom.  RFC-8311 does
> not *in itself* allow routers to treat the two ECT codepoints differently;
it
> merely allows the IETF to approve an experiment which does so.  It has not
> yet done so.
> 
>  - Jonathan Morton

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