Re: [quicwg/base-drafts] Renumber packet types and invert Connection ID Flag (#956)

[Dmitri Tikhonov <[e-mail]>]

> With the previous numbering scheme, on the server side, we can just look at the first two bits. If either is 1, then it's IETF QUIC, and if both are 0, it's GQUIC.

I see.  If one can assume that 0x40 (multipath) bit is never set in GQUIC, then this is indeed very easy.  I did not make this assumption in my analyses to err on the conservative side.

> But I believe the nonce bit is the bit that would end up being the spin bit, which could start making things pretty tricky. It's probably worth thinking through what happens if two bits are reserved for measurement.

Are you saying that the packet type in the short header would be narrower and occupy fewer than the currently-allocated low five bits?  (I apologize for not being on top of this development.)

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