Re: [multipathtcp] q about off-path proxy (explicit mode)
<mohamed.boucadair@orange.com> Mon, 27 March 2017 15:06 UTC
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From: mohamed.boucadair@orange.com
To: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>, multipathtcp <multipathtcp@ietf.org>
Thread-Topic: [multipathtcp] q about off-path proxy (explicit mode)
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Date: Mon, 27 Mar 2017 15:06:27 +0000
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Subject: Re: [multipathtcp] q about off-path proxy (explicit mode)
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Hi Yoshi, Olivier already answered to many of your points. There are other communication scenarios not included in your list that we want to cover. Below some additional comments. Cheers, Med De : multipathtcp [mailto:multipathtcp-bounces@ietf.org] De la part de Yoshifumi Nishida Envoyé : samedi 25 mars 2017 08:08 À : multipathtcp Objet : [multipathtcp] q about off-path proxy (explicit mode) Hello, Now, I am trying to understand off-path (explicit mode) scenarios. In explicit mode, we need to tell the final destination to the proxy through MP_Convert Information Element. But, this requires mptcp connections. In order to clarify which cases can use this mode, I have drawn the following 7 cases. I am wondering if we can support case 3) 4) 5) with explicit mode or not. Also, supporting case 6), 7) seems to be a bit unclear. It would be great if some folks could clarify this. ----------------------------------------------------------------------------- C ... client, S ... Server, P ... Proxy, MCIE ... MP_Convert Information Element ==== ... mptcp connection ---- ... tcp connection single proxy cases 1) C ========== P -------- S : C tells S's addr to P by MCIE 2) C ========== P ======== S : C tells S's addr to P by MCIE 3) C ---------- P ======== S : How C tell S's address to P? [Med] The communication between C and P relies on TCP. C does not need to supply any information to P for case 3. The client is not even aware about the presence of P in this case. double proxy cases 4) C -------- P1 ======== P2 ------- S : How C tell S's address to P1? [Med] S is the destination IP address of the packets sent from C to P1. There is no need for an object to supply that information. 5) C -------- P1 ======== P2 ======= S : How C tell S's address to P1? [Med] S is the destination IP address of the packets sent from C to P1. 6) C ======== P1 ======== P2 ------- S : C tells S's addr to P1 by MCIE and P1 forwards it to P2? [Med] No. S is the destination IP address of the packets sent from C to P1. MCIE is not needed in the C-P1 leg. 7) C ======== P1 ======== P2 ======= S : C tells S's addr to P1 by MCIE and P1 forwards it to P2? [Med] No. S is the destination IP address of the packets sent from C to P1.
- [multipathtcp] q about off-path proxy (explicit m… Yoshifumi Nishida
- Re: [multipathtcp] q about off-path proxy (explic… Olivier Bonaventure
- Re: [multipathtcp] q about off-path proxy (explic… mohamed.boucadair
- Re: [multipathtcp] q about off-path proxy (explic… Yoshifumi Nishida
- Re: [multipathtcp] q about off-path proxy (explic… mohamed.boucadair
- Re: [multipathtcp] q about off-path proxy (explic… Yoshifumi Nishida
- Re: [multipathtcp] q about off-path proxy (explic… Olivier Bonaventure
- Re: [multipathtcp] q about off-path proxy (explic… mohamed.boucadair
- Re: [multipathtcp] q about off-path proxy (explic… Yoshifumi Nishida
- Re: [multipathtcp] q about off-path proxy (explic… philip.eardley