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@janaiyengar
janaiyengar committed Dec 21, 2018
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6 changes: 4 additions & 2 deletions draft-ietf-quic-transport.md
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Expand Up @@ -3065,8 +3065,10 @@ this happens, and if verification succeeds, the local reference counts MUST be
increased to match the counts in the ACK frame.

Processing counts out of order can result in verification failure. An endpoint
MUST NOT perform this verification if the ACK frame is received in a packet with
packet number lower than a previously received ACK frame.
SHOULD NOT perform this verification if the ACK frame is received in a packet
with packet number lower than a previously received ACK frame. Verifying based
on ACK frames that arrive out of order can result in disabling ECN
unnecessarily.

Upon successful verification, an endpoint continues to set ECT codepoints in
subsequent packets with the expectation that the path is ECN-capable.
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