[multipathtcp] towards a potential work item on two-ended proxy

<philip.eardley@bt.com> Thu, 21 July 2016 16:12 UTC

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From: philip.eardley@bt.com
To: multipathtcp@ietf.org
Thread-Topic: towards a potential work item on two-ended proxy
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Date: Thu, 21 Jul 2016 16:12:50 +0000
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Subject: [multipathtcp] towards a potential work item on two-ended proxy
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We started the discussion yesterday on a potential new work item on "two-ended proxy scenario" - where there's an MPTCP proxy in both the CPE and an aggregation point (for instance). The current charter is that one end host is MPTCP.

If I can try and summarise the brief discussion yesterday (plus some side discussions) (please correct my inaccuracies):

-          there are now deployments & products with an MPTCP proxy at each end, plus planned Broadband Forum work (WT-348 is about to be made public, with subsequent work to follow). So IETF work is timely (eg help allow an operator to buy CPE from one vendor and aggregation gateway from another vendor).

-          However, some people object to going beyond the current charter's "one-ended proxy scenario" (since the "two-ended proxy" discourages deployment of MPTCP to all the end hosts, which is the ultimate goal)

-          There are two proposals (transparent & plain mode: draft-boucadair-mptcp-plain-mode-08 & draft-peirens-mptcp-transparent-00). Are these addressing different use cases, or do we need to choose between them? would a (potential) charter item be to standardise existing draft(s), or to solve a problem /scenario?

-          I think there was mention (by Wim??) that there's a third proposal - how does this fit in, or did I get it wrong?

-          One aspect of the plain mode draft is to allow transport of UDP traffic as well as TCP traffic. I think this is a proposal that should be discussed separately  - for instance it needs INT-area expertise.

I think it would be good to have more discussion before attempting to write some potential charter text (and then seeing if there's consensus for it).

Thanks!
Philip Eardley
Research and Innovation
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