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When to send an immediate ACK #319

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Feb 28, 2025
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When to send an immediate ACK #319

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4 changes: 4 additions & 0 deletions draft-ietf-quic-ack-frequency.md
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Expand Up @@ -388,6 +388,10 @@ than or equal to the Reordering Threshold value. Sending this additional ACK wil
reset the max_ack_delay timer and Ack-Eliciting Threshold counter (as any ACK
would do).

When an ack-eliciting packet is received with a packet number less than
Largest Acked, this still triggers an immediate acknowledgement in an effort to
avoid the packet being spuriously declared lost.

See {{examples}} for examples explaining this behavior. See {{set-threshold}}
for guidance on how to choose the reordering threshold value when sending
ACK_FREQUENCY frames.
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