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Suggestions from #2197 #2316

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3 changes: 2 additions & 1 deletion draft-ietf-quic-transport.md
Expand Up @@ -2835,7 +2835,8 @@ received packet that contains frames other than ACK and PADDING frames.
An endpoint MUST NOT send a packet containing only an ACK frame in response
to a packet containing only ACK or PADDING frames, even if there are packet
gaps which precede the received packet. This prevents an indefinite feedback
loop of ACKs.
loop of ACKs. The endpoint MUST however acknowledge packets containing only
ACK or PADDING frames when sending ACK frames in response to other packets.

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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