Re: [quicwg/base-drafts] Retaining the largest received packet number (#3541)

[ianswett <[e-mail]>]

For out of order ACK frames, you can use the packet number the ACK arrives in.  I realize that we have tried to allow frames to be retransmitted, but I think retransmitting ACK frames without modifying the ACK delay/etc is so harmful we should probably prohibit that one frame from being retransmitted, since it creates a bunch of edge cases.  Or we could let ECN validation could fail, but that'd be a bit sad.

I'm confused about what the issue with key updates is?  The largest acked you've ever seen doesn't change, just the largest acked from the last ACK frame.  When determining the size of the packet number, we say: "The sender MUST use a packet number size able to represent more than twice as large a range than the difference between the largest acknowledged packet and packet number being sent."

I'd rather not make this a MUST unless we have a good reason.  There are valid use cases that become more complex with this constraint.

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