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Sender/Receiver #1634

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13 changes: 6 additions & 7 deletions draft-ietf-quic-recovery.md
Expand Up @@ -1212,19 +1212,18 @@ packet size. Acknowledgement patterns may expose information about link
characteristics or application behavior. Endpoints can use PADDING frames or
bundle acknowledgments with other frames to reduce leaked information.


## Misreporting ECN Markings

An endpoint can misreport ECN markings to alter the congestion response of a
peer. Suppressing reports of ECN-CE markings could cause a peer to increase
their send rate. This increase could result in congestion and loss.
A receiver can misreport ECN markings to alter the congestion response of a
sender. Suppressing reports of ECN-CE markings could cause a sender to
increase their send rate. This increase could result in congestion and loss.

An endpoint MAY attempt to detect suppression of reports by marking occasional
A sender MAY attempt to detect suppression of reports by marking occasional
packets that they send with ECN-CE. If a packet marked with ECN-CE is not
reported as having been marked when the packet is acknowledged, the endpoint
reported as having been marked when the packet is acknowledged, the sender
SHOULD then disable ECN for that path.

Reporting additional ECN-CE markings will cause a peer to reduce their sending
Reporting additional ECN-CE markings will cause a sender to reduce their sending
rate, which is similar in effect to advertising reduced connection flow control
limits and so no advantage is gained by doing so.

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