On Mon, Nov 29, 2021 at 6:04 AM Eric Vyncke (evyncke) <evyncke= [email protected]> wrote:
> Just a heads-up to the DPRIVE WG and for the DoQ authors[1]: after some > discussions within IESG/IAB, I am afraid that UDP/853 won't be allocated to > DoQ. Nothing definitive yet of course but IAB/IESG have raised the > following concerns: > > > > - Lack of real technical motivation (except for 'symmetry' or for > operational reasons). > - Moving DoDTLS to historic will not help, as it will simply return > udp/853 to the pool to be re-used later. > - The *currently* possible demux between QUIC & DTLS is not something > carved in stone forever. Hence, a future problem can happen if DTLS v23 > cannot be demuxed from QUIC v19. This would put a heavy constraint on > the evolution of both QUIC & DTLS, i.e., ossifying both protocols. Not to > mention that both QUIC & DTLS want to expose as little as possible to > observers, making demux of future versions quite improbable... > > I don't particularly care whether 853 is assigned to DoQ or not, but these reasons do not strike me as particularly strong. In particular, there are at least sets of indicia that allow for demuxing DTLS and QUIC: - Bit 0x40, which is 1 in QUIC and 0 in DTLS. - All QUIC packets are integrity protected (the early ones with a fixed key) I doubt that this second thing is going to change materially (though of course the key may change) so it seems likely that it will be possible to distinguish QUIC from DTLS indefiitely. -Ekr
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