Re: [multipathtcp] potential MPTCP proxy charter item

<mohamed.boucadair@orange.com> Wed, 19 October 2016 05:28 UTC

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From: mohamed.boucadair@orange.com
To: Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>
Thread-Topic: [multipathtcp] potential MPTCP proxy charter item
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Date: Wed, 19 Oct 2016 05:28:02 +0000
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Subject: Re: [multipathtcp] potential MPTCP proxy charter item
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Hi Mirja, 

I'm for these two cases to be included:
* Case 1 is the mandatory piece to have.
* Case 2 solves the problem for no TCP traffic while leveraging on the same extensions that are used for case 1.  

I do fully agree that case 2 requires inter-area/WG coordination. 

Cheers,
Med

> -----Message d'origine-----
> De : Mirja Kühlewind [mailto:mirja.kuehlewind@tik.ee.ethz.ch]
> Envoyé : mardi 18 octobre 2016 17:46
> À : BOUCADAIR Mohamed IMT/OLN
> Cc : Henderickx, Wim (Nokia - BE); philip.eardley@bt.com;
> multipathtcp@ietf.org
> Objet : Re: [multipathtcp] potential MPTCP proxy charter item
> 
> Hi Med, hi all,
> 
> there are two cases to distinguish here:
> 
> 1) you have one or two MPTCP proxies that terminate the TCP connection and
> open a new MPTCP connection
> 
> 2) you tunnel other traffic over MPTCP
> 
> Case two is using TCP as a tunneling mechanism. This is discussed in
> several working groups for different purposes and is not very straight-
> forward in a lot of cases. Such an approach definitely needs coordination
> and transport as well as tunnel expertise.
> 
> Which case are you talking about? While Phil’s proposal sounded rather
> like case 1, your proposal sounds very much like case 2.
> 
> Mirja
> 
> 
> > Am 18.10.2016 um 07:52 schrieb mohamed.boucadair@orange.com:
> >
> > Hi Wim,
> >
> > Yes, this can be main stream.
> >
> > Cheers,
> > Med
> >
> > De : Henderickx, Wim (Nokia - BE) [mailto:wim.henderickx@nokia.com]
> > Envoyé : lundi 17 octobre 2016 23:22
> > À : BOUCADAIR Mohamed IMT/OLN; philip.eardley@bt.com;
> multipathtcp@ietf.org
> > Objet : Re: [multipathtcp] potential MPTCP proxy charter item
> >
> > Sorry for the late reply, but more in-line
> >
> > From: multipathtcp <multipathtcp-bounces@ietf.org> on behalf of
> "mohamed. boucadair" <mohamed.boucadair@orange.com>
> > Date: Friday, 7 October 2016 at 09:08
> > To: "philip.eardley@bt.com" <philip.eardley@bt.com>,
> "multipathtcp@ietf.org" <multipathtcp@ietf.org>
> > Subject: Re: [multipathtcp] potential MPTCP proxy charter item
> >
> > Hi Phil,
> >
> > Please see inline.
> >
> > Cheers,
> > Med
> >
> > De : multipathtcp [mailto:multipathtcp-bounces@ietf.org] De la part de
> philip.eardley@bt.com
> > Envoyé : lundi 8 août 2016 11:50
> > À : multipathtcp@ietf.org
> > Objet : [multipathtcp] potential MPTCP proxy charter item
> >
> > I had thought a potential charter item could be something on the lines
> of:
> > <Experimental Extensions to the MPTCP protocol to enable an MPTCP-aware
> middlebox to act as an MPTCP proxy for an end host, which runs TCP. One or
> both end hosts may be MPTCP-unaware, and the MPTCP proxy(s) is (are) not
> necessarily on the default routing path(s). The working group will also
> detail, in an Informational document, the use cases /deployment scenarios
> and the operational considerations.>
> >
> > [Med] I would like to see the charter includes the following; “The
> working group will also edit Network-Assisted Multipath provisioning
> documents. In particular, the WG will specify DHCP options and RADIUS
> attributes for MPTCP.”
> >
> >
> > WH> I am fine with this, but why do we state experimental extensions?
> Why is this not main stream?
> > However, if I get the discussion right, this is not quite right.
> > * assume a controlled environment (to avoid a problem where the message
> reaches the ‘wrong’ proxy) (IETF usually prefers generally applicable
> protocols)
> > * assume some (?additional) ‘header swapping’ protocol and a new
> signalling protocol (not an mptcp extension – so probably in INTAREA WG’s
> remit)
> > [Med] IMHO, it is not odd to document in the mptcp wg how a Network-
> Assisted MPTCP solution can also be applicable to other protocols (UDP in
> particular). This work can be done jointly/closely with other WGs. The
> important point is whether there is enough interest from the mptpcp WG
> members to work on this.
> > WH> indeed is to specify the means in MPTCP WG and other WG can be
> consulted to review the work. If you split it out it becomes less
> efficient from a protocol perspective.
> > If the above is roughly right, then I think some extra work is needed
> before we can get a clear charter item. Can some of the work that isn’t
> mptcp extensions be cleanly separated out? Can you be clear what
> deployment assumptions are being made (and preferably reduce them, so
> there is wider applicability). Personally I’d also find it very helpful if
> the plain/transparent ‘merged’ draft could try and follow the guidance
> about protocol models in RFC4101 (personally I found the plain mode doc
> difficult to understand).
> >
> > Thanks
> > phil
> >
> >
> >
> > _______________________________________________
> > multipathtcp mailing list
> > multipathtcp@ietf.org
> > https://www.ietf.org/mailman/listinfo/multipathtcp