Re: [multipathtcp] q about on-path proxy
<mohamed.boucadair@orange.com> Wed, 22 March 2017 10:31 UTC
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From: mohamed.boucadair@orange.com
To: "Olivier.Bonaventure@uclouvain.be" <Olivier.Bonaventure@uclouvain.be>, Yoshifumi Nishida <nishida@sfc.wide.ad.jp>, multipathtcp <multipathtcp@ietf.org>
Thread-Topic: [multipathtcp] q about on-path proxy
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Date: Wed, 22 Mar 2017 10:31:03 +0000
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Subject: Re: [multipathtcp] q about on-path proxy
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Re-, Thank you for the clarification. Please see inline. Cheers, Med > -----Message d'origine----- > De : Olivier Bonaventure [mailto:Olivier.Bonaventure@uclouvain.be] > Envoyé : mercredi 22 mars 2017 11:13 > À : BOUCADAIR Mohamed IMT/OLN; Yoshifumi Nishida; multipathtcp > Objet : Re: [multipathtcp] q about on-path proxy > > Med, > > > > +------- R4 ---- R5 --------+ > > C --- uMCP ---- R1 ---- R2 ------ dMCP ---- R6 --- R7 --- S > > > > >>> Also, in the two proxy scenario, does the downstream MCP have to be > >>> on-path? > >> > >> If the downstream MCP is on path, then it does not have to include any > >> NAT function which is beneficial from an operational viewpoint. > >> > >> > > > > [Med] Perhaps I misunderstood your point but DNAT/SNAT are still needed > for subsequent subflows even for the implicit case. Think about subflows > that are placed with a destination address set to the one of the MCP and > with a distinct source IP address than the one used to place the initial > subflow. > > By no NAT, I mean that all the packets between the client and the server > that the operator would observe on the R1-R2 path or the R6-R7 path have [Med] For the R6-R7 leg, this is valid for all MCP deployments with source address/prefix preservation. > C/S as source/destination addresses. This means that the existing > techniques that are used for logging, traffic control or monitoring that > depends on addresses can be reused without any modification. [Med] Agree, if these functions are located in the R1-R2 leg. Some adjustments may be needed (Legal Intercept, for example), but that is out of scope. > > When the uMCP creates a subflow towards the dMCP, it uses other > addresses than C and S, but these addresses are invisible to both the > client and the final server. [Med] Yes, this is the SNAT/DNAT I mentioned. > > Olivier
- [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)