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Re: Opsdir last call review of draft-ietf-quic-manageability-14

Paul Vixie <paul@redbarn.org> Wed, 16 March 2022 19:57 UTC

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Subject: Re: Opsdir last call review of draft-ietf-quic-manageability-14
To: Mirja Kuehlewind <mirja.kuehlewind@ericsson.com>, "quic@ietf.org" <quic@ietf.org>
Cc: "last-call@ietf.org" <last-call@ietf.org>, "draft-ietf-quic-manageability.all@ietf.org" <draft-ietf-quic-manageability.all@ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
References: <CH0PR02MB7980CA04E5EADBF6D25AD8F2D3319@CH0PR02MB7980.namprd02.prod.outlook.com> <D82872C2-4C79-45AB-92F1-9F27B324ADE0@ericsson.com> <CH0PR02MB79803C4AF8ED0F28A5F81D30D3009@CH0PR02MB7980.namprd02.prod.outlook.com> <5224BCAC-B8EC-4150-B3B1-5735056BC54C@ericsson.com> <CH0PR02MB798003A25A1C96D02F1FE525D3069@CH0PR02MB7980.namprd02.prod.outlook.com> <346C0025-B1CB-4CAF-BB23-A7E09D79E9B5@ericsson.com> <DM8PR02MB7973BBE35F26700D004BF9A3D3119@DM8PR02MB7973.namprd02.prod.outlook.com>
From: Paul Vixie <paul@redbarn.org>
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Date: Wed, 16 Mar 2022 12:57:29 -0700
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mirja, et al, in reviewing manageability-15, i see this text:

>    The QUIC wire image is not specifically designed to be
>    distinguishable from other UDP traffic by a passive observer in the
>    network.

i think this has an excluded middle problem, and should be changed to:

<<The QUIC wire image is specifically designed to be indistinguishable 
from other UDP traffic by a passive observer in the network.>>

this follows from RFC 7258, and is uncontroversial in the light thereof.

further to this point, i'd like to suggest adding a paragraph to the end 
of section 3.1 (Identifying QUIC Traffic):

<<Management of QUIC traffic can never be reliable, and if it becomes so 
over time, then the QUIC wire image would be forced to evolve. Therefore 
a heuristic along the lines of "any unrecognizable UDP traffic could be 
QUIC" is the least unappealing way for a network operator to 
characterize their network's UDP traffic in the QUIC era.>>

thanks in advance for your consideration.

vixie

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