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Re: [multipathtcp] A question related to MPTCP control overhead

Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be> Mon, 10 April 2017 08:06 UTC

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To: Sayee Kompalli Chakravartula <sayee.kompalli.chakravartula@huawei.com>, "multipathtcp@ietf.org" <multipathtcp@ietf.org>
From: Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be>
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Date: Mon, 10 Apr 2017 10:06:15 +0200
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Subject: Re: [multipathtcp] A question related to MPTCP control overhead
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Hello,

> Thanks for the response. While preparing reply to your observation, I came across your 2013 Sigcomm paper "Are TCP Extensions Middlebox-proof?", and I believe that I should read that paper before I reply you.
>
> I thought of a rough sketch of solution without regard to what middleboxes can do, which essentially assumes a state-machine at both ends. Before I embark on designing a solution, if at all feasible, I wanted to know how others think of such an issue. Hope to reply you soon.

My fear is that any solution would introduce a significant change to 
Multipath TCP. We have evidence from the widespread utilisation of 
Multipath TCP by Apple for Siri that the current design (DSS in all 
segments, including initial subflow) works well in today's Internet. 
Changing this part for rfc6824bis looks very risky to me.


Olivier

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