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Re: [multipathtcp] [tcpm] Working group acceptance of draft-bonaventure-mptcp-converters ?

Joe Touch <touch@strayalpha.com> Tue, 05 December 2017 14:39 UTC

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To: mohamed.boucadair@orange.com, "Scharf, Michael (Nokia - DE/Stuttgart)" <michael.scharf@nokia.com>, "tcpm@ietf.org" <tcpm@ietf.org>, multipathtcp <multipathtcp@ietf.org>
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From: Joe Touch <touch@strayalpha.com>
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Date: Tue, 05 Dec 2017 06:39:11 -0800
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Subject: Re: [multipathtcp] [tcpm] Working group acceptance of draft-bonaventure-mptcp-converters ?
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Med,

Cutting to the points:

- expressing the IP/port in-band is fine; saying it is "in the SYN"
directly is not
    - as a user of TCP, an application-layer program does not have that
control

- if this is really (as you say) an application proxy" then let's assume
you just indicate "send the IP/port as the first data in the stream"
    - in that case, you are an application and not a change to TCP, so
*out of scope for* TCPM
    - in that case, you also basically undermine a given service (moving
its port AND changing its stream contents) for the purpose of increasing
use of some TCP options (this is where the history of TCPMUX RFC1078 is
useful - see RFC7805).

Either way, my view is this document should not be adopted by TCPM.

Joe

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