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RFC 9000, "QUIC: A UDP-Based Multiplexed and Secure Transport", May 2021

Source of RFC: quic (wit)

Errata ID: 8106
Status: Rejected
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Lars Eggert
Date Reported: 2024-09-17
Rejected by: Zaheduzzaman Sarker
Date Rejected: 2024-10-14

Section 13.2.1 says: 

   Every packet SHOULD be acknowledged at least once, and ack-eliciting
   packets MUST be acknowledged at least once within the maximum delay
   an endpoint communicated using the max_ack_delay transport parameter;

It should say:

   Every packet SHOULD be acknowledged at least once, and ack-eliciting
   packets MUST be acknowledged at least once. All acknowledgments MUST
   occur within the maximum delay an endpoint communicated using the
   max_ack_delay transport parameter;

Notes:

The original text can be read as if it were OK to only ACK once within the max_ack_delay, and not always.
--VERIFIER NOTES--
Based on the discussion here (https://mailarchive.ietf.org/arch/msg/quic/14r68SfepLclHMnur6Ur9-F2rnY/) the errata is rejected.

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