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Update draft-ietf-quic-transport.md
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ianswett committed Jul 2, 2019
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9 changes: 4 additions & 5 deletions draft-ietf-quic-transport.md
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Expand Up @@ -2868,11 +2868,10 @@ one ACK-frame-only packet in response to receiving an ACK-eliciting packet
(one containing frames other than ACK and/or PADDING). An endpoint MUST NOT
send a packet containing only an ACK frame in response to a non-ACK-eliciting
packet (one containing only ACK and/or PADDING frames), even if there are
packet gaps which precede the received packet. Limiting ACK
frames avoids an infinite feedback loop of acknowledgements,
which could prevent the connection from ever becoming idle. The endpoint MUST
however acknowledge non-ACK-eliciting packets when sending ACK frames in
response to ACK-eliciting packets.
packet gaps which precede the received packet. Limiting ACK frames avoids an
infinite feedback loop of acknowledgements, which could prevent the connection
from ever becoming idle. However, the endpoint acknowledges non-ACK-eliciting
packets when it sends an ACK frame.

Packets containing PADDING frames are considered to be in flight for congestion
control purposes {{QUIC-RECOVERY}}. Sending only PADDING frames might cause the
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