Re: [multipathtcp] q about on-path proxy
Yoshifumi Nishida <nishida@sfc.wide.ad.jp> Fri, 24 March 2017 18:07 UTC
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From: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
Date: Fri, 24 Mar 2017 11:07:02 -0700
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To: mohamed.boucadair@orange.com
Cc: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>, "Olivier.Bonaventure@uclouvain.be" <Olivier.Bonaventure@uclouvain.be>, multipathtcp <multipathtcp@ietf.org>
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Subject: Re: [multipathtcp] q about on-path proxy
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Hi Med, Thanks for the response. Just one point.. On Thu, Mar 23, 2017 at 11:41 PM, <mohamed.boucadair@orange.com> wrote: > Hi Yoshi, > > > > Please see inline. > > > > Cheers, > > Med > > > > *De :* Yoshifumi Nishida [mailto:nishida@sfc.wide.ad.jp] > *Envoyé :* jeudi 23 mars 2017 23:38 > *À :* Olivier.Bonaventure@uclouvain.be; BOUCADAIR Mohamed IMT/OLN > *Cc :* multipathtcp > *Objet :* Re: [multipathtcp] q about on-path proxy > > > > Hello Olivier, Med, > > > > Thanks for providing detailed responses. I feel that things now got > clearer than before. > > In my understanding, the benefits for on-path mode is MCP can stop > intercepting and splitting connection once it learns that both endpoints > support MPTCP. if there're other benefits, please point out. > > > > One thing which is not very clear to me yet is MP_PREFER_PROXY. > > Med explained that there is a way to learn the endpoints support MPTCP. I > think MCPs can learn it through the method described in Figure 15, however > I'm not sure how the sender can learn it. > > [Med] An implementation example would look like the following : > > · A sends a SYN message with MP_CAPABLE+MP_PREFER_PROXY to B > > · This SYN is intercepted by an MCP which tracks the connection, > that is: it removes the MP_PREFER_PROXY and add filters to intercept > relevant incoming SYN/ACK. The SYN (MP_CAPABLE) is then forwarded to the > next hop and so on, until it reaches B. > > · If the SYN/ACK received from B includes MP_CAPABLE, the MCP > will forward it to A. A is now aware that B is MPTCP-capable and they can > establish subsequent subflows directly. The MCP does not announce > explicitly itself to A. > Hmm. I am not sure about this. I understand A will receive MP_CAPABLE from B in this case. But, I think even B doesn't support MPTCP, A will receive MP_CAPABLE from B which is created by MCP (by spoofing). So, I think A cannot identify whether this is from B or MCP. -- Yoshi >
- [multipathtcp] q about on-path proxy Yoshifumi Nishida
- Re: [multipathtcp] q about on-path proxy Olivier Bonaventure
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy Olivier Bonaventure
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy Yoshifumi Nishida
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy Olivier Bonaventure
- Re: [multipathtcp] q about on-path proxy Yoshifumi Nishida
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy philip.eardley
- Re: [multipathtcp] q about on-path proxy philip.eardley
- Re: [multipathtcp] q about on-path proxy mohamed.boucadair
- Re: [multipathtcp] q about on-path proxy philip.eardley
- Re: [multipathtcp] q about on-path proxy Yoshifumi Nishida
- Re: [multipathtcp] q about on-path proxy Henderickx, Wim (Nokia - BE/Antwerp)