Re: [quicwg/base-drafts] Fragility in ECN counters with lost acks (#1481)

janaiyengar <notifications@github.com> Thu, 28 June 2018 23:16 UTC

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Subject: Re: [quicwg/base-drafts] Fragility in ECN counters with lost acks (#1481)
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I don't think this is adequate. @ianswett pointed out that a sender may choose to not retain state about a packet that is not yet acknowledged because, for example, the contents were retransmitted in a new packet. When an ack for such a "forgotten" packet arrives, the endpoint won't know it to be an as yet unacknowledged packet, since there's no state for the packet. At the same time, the ECN counters would have increased.

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