Re: [quicwg/base-drafts] Proposal for adding ECN support to QUIC. (#1372)

[ianswett <[e-mail]>]

ianswett commented on this pull request.



> @@ -2887,6 +3033,95 @@ by a client in protected packets, because it is certain that the server is able
 to decipher the packet.
 
 
+## ACK_ECN Frame {#frame-ack-ecn}
+
+A QUIC connection MUST keep counters for each ECN codepoint, recording
+the number of packets that were received with the corresponding ECN
+codepoint in the IP header. If the header is not readable from the
+application, the codepoint 00 (Not-ECT) MUST be assumed. If any packet
+are duplicated by the network then only the value of the ECN field of
+the packet copy first received SHALL be included in the counters, the ECN
+field value for a duplicate SHALL be ignored. This to prevent the

I believe the reason TCP counts all CEs is because TCP retransmits packets, not because of an effort to count packets the network inadvertently duplicated.  QUIC does not duplicate packets and instead uses new packet numbes for retransmissions, so I believe this embodies the intent of the requirement.

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