Re: [quicwg/base-drafts] Integrate QUIC text from DPLPMTUD (#3693)

Martin Thomson <> Tue, 26 May 2020 23:50 UTC

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Date: Tue, 26 May 2020 16:49:59 -0700
From: Martin Thomson <>
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Subject: Re: [quicwg/base-drafts] Integrate QUIC text from DPLPMTUD (#3693)
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@martinthomson commented on this pull request.

> +state when the QUIC connection handshake has been completed and
+the endpoint has established a 1-RTT key.

@gorryfair replies (below, repeated to keep the thread intact):

> The reason why we didn't suggest this within DPLPMTUD, was two things:
> * Using the limited for IW for packet probes rapidly consumes the current IW space in bytes, and we were unconvinced of the importance to tenatively try a large PMTU during the first RTT.
> * I was not aware of measurement data about how changing the initial flight of data would impact congestion collapse, since at this point there is no feedback from the receiver, and it seems, at least to me, to raise questions regarding stability with large numbers of flows and also as you note, the potential DoS opportunities.
> So, I'd be interested in what people think about this, and see any analysis and experience.

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