The following errata report has been submitted for RFC9000,
"QUIC: A UDP-Based Multiplexed and Secure Transport".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid7374

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Type: Technical
Reported by: Bob Briscoe <[email protected]>

Section: 13.4.1

Original Text
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                                                               If an
   endpoint does not implement ECN support or does not have access to
   received ECN fields, it does not report ECN counts for packets it
   receives.

   Even if an endpoint does not set an ECT field in packets it sends,
   the endpoint MUST provide feedback about ECN markings it receives, if
   these are accessible.  

Corrected Text
--------------
                                                               If an
   endpoint does not have access to
   received ECN fields, it does not report ECN counts for packets it
   receives.

   Even if an endpoint does not set an ECT field in packets it sends,
   the endpoint MUST provide feedback about ECN markings it receives, if
   these are accessible.  

Notes
-----
In the second sentence, the only allowed exception to "MUST provide feedback 
about received ECN markings" is inaccessibility. The first sentence contradicts 
this by allowing two exceptions: inaccessibility and just "not implementing ECN 
support". 

If "not implementing ECN support" was really intended to be an allowed 
exception, the capitalized "MUST" would have been pointless.

Therefore it is proposed that the words "does not implement ECN support or " 
are deleted from the first paragraph.

Instructions:
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RFC9000 (draft-ietf-quic-transport-34)
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Title               : QUIC: A UDP-Based Multiplexed and Secure Transport
Publication Date    : May 2021
Author(s)           : J. Iyengar, Ed., M. Thomson, Ed.
Category            : PROPOSED STANDARD
Source              : QUIC
Area                : Transport
Stream              : IETF
Verifying Party     : IESG

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