Re: [quicwg/base-drafts] Connection ID lengths 1, 2 and 3 bytes can't be encoded (#1570)

[janaiyengar <[e-mail]>]

@ekr @martinthomson : I think it's useful to have this degree of freedom for uses, for instance, where there's no migration, but only demultiplexing among a few connections. I understand the concern that having connection ID that's too small can lead to linkability, but I think there's a natural pushback here -- servers that use connection ID for demuxing will want to use a large CID because small ones are not enough, or they'll use no CID. The only place a small one becomes interesting is when (i) there are only a few connections being demuxed and (ii) where the bit cost matters. This is true in the p2p case, where I would argue that linkability is quite easy with just timing of packets.

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