Re: [multipathtcp] potential MPTCP proxy charter item
<mohamed.boucadair@orange.com> Tue, 08 November 2016 10:07 UTC
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From: mohamed.boucadair@orange.com
To: Joe Touch <touch@isi.edu>, Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>, "Olivier.Bonaventure@uclouvain.be" <Olivier.Bonaventure@uclouvain.be>
Thread-Topic: [multipathtcp] potential MPTCP proxy charter item
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Date: Tue, 08 Nov 2016 10:07:07 +0000
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References: <CCD1A987-0F3C-4775-8B0E-5232965E7E22@nokia.com> <22907_1476946228_58086934_22907_5464_1_a7bca8d2-7656-4ff0-9f01-cf307f017148@OPEXCLILM42.corporate.adroot.infra.ftgroup> <57543A7A-1542-4C60-A5D3-E1658354BE5A@tik.ee.ethz.ch> <73a1c0dd64a843a5baa645d960c82886@rew09926dag03b.domain1.systemhost.net> <b8bfd5c6-21eb-4c4f-879a-851c3a71792a@OPEXCLILM31.corporate.adroot.infra.ftgroup> <56CE164A-9A62-4B57-9CFF-33DBD45BA8B2@gmail.com> <787AE7BB302AE849A7480A190F8B933009D9CA84@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <85D52AE4-FE5F-4977-8927-6BDB72614D07@gmail.com> <787AE7BB302AE849A7480A190F8B933009DAAA88@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <D2630820-7586-4361-A626-3278F22C319C@gmail.com> <B7D8197F-D833-41BB-A4A4-D6F31A3B8993@tik.ee.ethz.ch> <4fceb7e5-a0b0-d4d2-8669-fad0df59095d@uclouvain.be> <C0212561-63DA-4578-9795-928B51F2A71B@tik.ee.ethz.ch> <c93d9d6b-f46b-2b11-da6b-a308159ef7c0@isi.edu> <00ba6ab8-8fbf-ab19-b996-b84b87ad5520@isi.edu> <F9AAAF6C-DF82-412E-9C88-9043CC1EC3AA@isi.edu>
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Cc: "multipathtcp@ietf.org" <multipathtcp@ietf.org>
Subject: Re: [multipathtcp] potential MPTCP proxy charter item
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Joe, I'm inserting the full text of that section here: ==== 4.2.2.5 TCP Options: RFC-793 Section 3.1 A TCP MUST be able to receive a TCP option in any segment. A TCP MUST ignore without error any TCP option it does not implement, assuming that the option has a length field (all TCP options defined in the future will have length fields). TCP MUST be prepared to handle an illegal option length (e.g., zero) without crashing; a suggested procedure is to reset the connection and log the reason. ==== The proposed design for the MP_CONVERT option does not violate that text, IMO. I'm listing here the design approaches that we considered so far: (1) no change to MP_CAPABLE: MPTCP proxies are prepared by design to look at the payload of SYN to retrieve MP_CONVERT options. * MP_CONVERT options are inserted in the payload of a SYN that includes MP_CAPABLE. * If the remote peer does not support MPTCP, the connection will be reverted to TCP according to the base MPTCP specification. * If the remote peer supports MPTCP, and it is prepared to receive options in the SYN payload, it will echo those options in the SYN/ACK. The MPTCP connection will continue. * If the remote peer supports MPTCP, but it is not prepared to receive options in the SYN payload, it will reply with a SYN/ ACK that does not echo MP_CONVERT. * The capabilities of the MPTCP proxy may be stored locally to determine whether future connections can make use of the MP_CPNVERT or not. Of course, this information will be flushed if a new MPTCP proxy is configured, or after the expiry of a timer. This is particularly useful for the explicit mode where it is likely that the same MPTCP proxy will handle all connections from the same subscriber. (2) change MP_CAPABLE to explicitly indicate that options are present in the SYN payload: * A flag in the MP_CAPABLE will be set to indicate to a remote peer that MP_CONVERT options are included in the payload. * If the remote peer does not support MPTCP, the connection will be reverted to TCP as per base MPTCP specification. * If the remote peer supports MPTCP, and is prepared to receive options in the payload, it will echo the flag in the SYN/ACK (and eventually the options). The MPTCP connection will continue. * If the remote peer supports MPTCP, but does not support that Flag, it won't echo the flag in the SYN/ACK. * The capabilities of the MPTCP proxy may be stored locally to determine whether future connections can make use of the MP_CPNVERT or not. Of course, this information will be flushed if a new MPTCP proxy is configured, or after the expiry of a timer. This is particularly useful for the explicit mode where it is likely that the same MPTCP proxy will handle all connections from the same subscriber. CONCLUSION: The proposed design satisfy both requirements in Section 4.2.2.5. In particular, this one: "A TCP MUST ignore without error any TCP option it does not implement" Cheers, Med > -----Message d'origine----- > De : multipathtcp [mailto:multipathtcp-bounces@ietf.org] De la part de Joe > Touch > Envoyé : lundi 7 novembre 2016 17:34 > À : Mirja Kühlewind; Olivier.Bonaventure@uclouvain.be > Cc : multipathtcp@ietf.org > Objet : Re: [multipathtcp] potential MPTCP proxy charter item > > More specifically - see section 4.2.2.5 of rfc1122. > > Joe > > > On Nov 7, 2016, at 8:07 AM, Joe Touch <touch@isi.edu> wrote: > > > > Oh - a quick followup. > > > > If you have an option that "poisons" the connection if not confirmed (as > > would using long EDO inside the SYN), then you have to retry without > > that option. That is *possible*, but there's another problem. > > > > RFC793 defines options as optional. Making any option mandatory would > > require updating RFC793. That sort of change is exactly why long EDO > > (actually extending the option space, rather than declaring the > > capability) is currently prohibited in EDO. > > > > Joe > > > > > >> On 11/7/2016 7:56 AM, Joe Touch wrote: > >> > >>> On 11/7/2016 7:42 AM, Mirja Kühlewind wrote: > >>> Do you mean the MCP forwards the original SYN (and basically does > nothing if the server supports MPTCP) or does the MCP terminate the TCP > connection and start a new TCP connection with MP_CAPABLE towards the > server? > >>> > >>> Mirja > >> If you're OK with needing to terminate a failed option exchange, then > it > >> might be possible to use EDO in the SYN in its current form. > >> > >> TCPM decided to prohibit that in the general case, but I could ask them > >> to allow that in very limited environments (but it could NEVER be > >> default on). > >> > >> Note - the use cases I'm hearing appear to assume very strong knowledge > >> about the other end of the connection and the path. In that case, you > >> probably can skip most - if not all - of the 'negotiation' options and > >> just start using them during the SYN too. However, if you say "no, we > >> need to confirm", then you would not be able to use EDO inside the SYN. > >> > >> Joe > > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp
- [multipathtcp] potential MPTCP proxy charter item philip.eardley
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Robert Skog
- Re: [multipathtcp] potential MPTCP proxy charter … Henderickx, Wim (Nokia - BE)
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Henderickx, Wim (Nokia - BE)
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Henderickx, Wim (Nokia - BE)
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Yoshifumi Nishida
- Re: [multipathtcp] potential MPTCP proxy charter … Henderickx, Wim (Nokia - BE)
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … christian.jacquenet
- Re: [multipathtcp] potential MPTCP proxy charter … Robert Skog
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … philip.eardley
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Christoph Paasch
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … Olivier Bonaventure
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Christoph Paasch
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Christoph Paasch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … Mirja Kühlewind
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … Joe Touch
- Re: [multipathtcp] potential MPTCP proxy charter … Alan Ford
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair
- Re: [multipathtcp] potential MPTCP proxy charter … mohamed.boucadair