Re: [quicwg/base-drafts] VN packets may be dropped more often when the QUIC bit is 0 (#2400)

[Jana Iyengar <[e-mail]>]

IIRC, the bit was a result of us wanting to demux with various other protocols, and as such, the entire purpose of the bit is to allow identification of QUIC. This may not be a feature we like, but it is a feature.

I don't think we should be talking about the bit, but about co-existence with the other protocols. We discussed this, @martinthomson made a presentation about it (in Montreal, I think), and we agreed to co-exist.

While it can be seen as a natural consequence of setting the QUIC bit, I think the question we want to ask is whether we ought to make this co-existence an invariant. If so, what is the minimal set of packets that need to be demux-able with these other protocols. (We've been over this before, but I don't think we discussed whether it was adequate to demux only for the long header.)

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