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

[Dmitri Tikhonov <[e-mail]>]

@ianswett writes:
> I think this change doesn't change how difficult it is to support GQUIC and IETF QUIC at once.

Could you please elaborate why you think that?

And (emphasis added):
> The fact we're not moving the connection ID really helps, since *we can always lookup by connection ID first*, and then if nothing is found, try to parse it as a handshake packet that creates a new connection.

This is quite expensive compared to simply examining the packet header!  One can also imagine a situation where a demultiplexer forwards packets to two separate (processes or machines) QUIC implementations: gQUIC and IETF QUIC.  The demux would not have the associated state.

The fallback to looking up a connection for each packet to determine which QUIC version it is should be used as last resort.  I hope we can avoid it.

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