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

Fair enough, then I think that text wasn't written with QUIC in mind.

As I mentioned previously, I think this is an edge case that is not a practical problem in real networks.  Unnecessary packet duplication is the real problem, not it's implications on ECN.

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