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Re: Fwd: New Version Notification for draft-liu-multipath-quic-01.txt

Christian Huitema <huitema@huitema.net> Mon, 14 December 2020 17:01 UTC

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Subject: Re: Fwd: New Version Notification for draft-liu-multipath-quic-01.txt
To: Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>, "安勍(莳逸)" <anqing.aq@alibaba-inc.com>, quic <quic@ietf.org>, 李振宇 <zyli@ict.ac.cn>, Yanmei Liu <miaoji.lym@alibaba-inc.com>, "Ma, Yunfei" <yunfei.ma@alibaba-inc.com>
References: <1baa86a9-455d-4256-85f2-9aee159afed9.miaoji.lym@alibaba-inc.com> <CAN1APdc_1+VwOoGaX16iaQPUXfySoD-bmjuSVBJ_gLF4HUBO1Q@mail.gmail.com>
From: Christian Huitema <huitema@huitema.net>
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Date: Mon, 14 Dec 2020 09:01:30 -0800
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On 12/14/2020 1:38 AM, Mikkel Fahnøe Jørgensen wrote:
> Would it be practical to lift the 32-bit constraint on the CID 
> sequence number?
>
> Even if it probably is enough for most use cases I find it unfortunate 
> to introduce a new constraint here because if affects design decisions 
> elsewhere in stack.
>
> For example, it could be required that a key is updated at least once 
> in every 2^31 sequence numbers, or the IV could be hashed and use a 
> sufficiently frequent key update.


It boils down to how much additional state you want to maintain in or to 
support multipath. The 32 bit constraint allows for a very simple 
implementation. I don't think applications are going to hit it in 
practice. Supposing one connection migration per second, the limit is 
not hit for one hundred years.

-- Christian Huitema

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