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Re: Structuring the BKK spin bit discussion

Christian Huitema <huitema@huitema.net> Mon, 29 October 2018 16:54 UTC

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From: Christian Huitema <huitema@huitema.net>
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In-Reply-To: <20181029160802.GD7258@ubuntu-dmitri>
Date: Mon, 29 Oct 2018 09:53:22 -0700
Cc: Lars Eggert <lars@eggert.org>, IETF QUIC WG <quic@ietf.org>
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References: <18A2F994-0E82-48E4-875D-93C674483D49@eggert.org> <20181029160802.GD7258@ubuntu-dmitri>
To: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
Subject: Re: Structuring the BKK spin bit discussion
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> On Oct 29, 2018, at 9:08 AM, Dmitri Tikhonov <dtikhonov@litespeedtech.com> wrote:
> 
>> On Mon, Oct 29, 2018 at 05:26:34PM +0200, Lars Eggert wrote:
>> We'd specifically like to ask client and server implementors with
>> projected sizable deployments to indicate whether they intent to
>> implement and deploy, if the WG decided to include the spin-bit in
>> the spec.
> 
> LiteSpeed Technologies will support the spin bit -- both in our
> server and client QUIC implementations -- if it make it into the
> draft.

My implementation is not used in any large scale deployment, but it does support the spin bit. In fact, it has configuration options to support spin bit variants: node, just spin, spin + vec, spin + QR. 

I think the strongest objection to the spin bit was put up by Marten during the last interim: measuring the RTT with the spin bit discloses the use of hidden path segments like VPN. This issue was not discussed during the privacy analysis.

The privacy issue could be mitigated by turning off the spin bit at privacy sensitive clients, but this would make these clients "stick out". 

One solution would be to remove the spin bit from the spec, trading off better privacy for worse management. I am considering another solution in which privacy sensitive clients hide the RTT by controlling the spin, for example spinning at fixed intervals. I plan testing that option in Picoquic.

-- Christian Huitema

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