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Re: [multipathtcp] MPTCP carrying UDP

Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be> Wed, 16 November 2016 09:07 UTC

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From: Olivier Bonaventure <Olivier.Bonaventure@uclouvain.be>
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Date: Wed, 16 Nov 2016 10:06:44 +0100
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Cc: "multipathtcp@ietf.org" <multipathtcp@ietf.org>, "Markus.Brunner3@swisscom.com" <Markus.Brunner3@swisscom.com>
Subject: Re: [multipathtcp] MPTCP carrying UDP
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Med,
>
> I would like to make two comments:
> * The implementers I have in mind are CPE vendors and Carrier-Grade platform manufacturers.
> * Implementation does not come for free.
>

Independently of the topic of this email, I'd like to point out that in 
the MPTCP working group most of the important decisions have been 
validated by early prototypes that have been evaluated and discussed in 
the working group. I think that this has served as an important "reality 
check" in the working group and has probably contributed to the good 
results that we have achieved with the various deployments that have 
been documented. With the open-source implementation of Multipath TCP in 
the Linux kernel, the cost of developing a prototype is not as high as 
developing a hardware implementation in some working groups.

Coming back to the proxy topic, TCP/MPTCP proxies have already been 
demonstrated, e.g. in
http://inl.info.ucl.ac.be/publications/multipath-middlebox
and extensions of this idea are deployed in the field.
I'm not aware of similar work showing that UDP can be safely 
encapsulated inside MPTCP for reactive applications.

Best regards,

Olivier

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