Re: [multipathtcp] Multipath TCP Address advertisement 2/5 - Reliability
Yoshifumi Nishida <nishida@sfc.wide.ad.jp> Thu, 04 August 2016 06:36 UTC
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From: Yoshifumi Nishida <nishida@sfc.wide.ad.jp>
Date: Wed, 3 Aug 2016 23:36:26 -0700
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Subject: Re: [multipathtcp] Multipath TCP Address advertisement 2/5 -
Reliability
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Hi Fabien, On Wed, Aug 3, 2016 at 8:47 AM, Fabien Duchêne <fabien.duchene@uclouvain.be> wrote: > Hello, > > As agreed in Berlin during IETF96, I'm sending a series of emails to > discuss the different contributions proposed > inhttps://datatracker.ietf.org/doc/draft-duchene-mptcp-add-addr/ > > This is the part 2/5 : reliability. > > In RFC6824, ADD_ADDR options can be attached to segments carrying data > or pure acknowledgements. > In practice, notably given the length of ADD_ADDR with IPv6 addresses > and the HMAC, it is very likely that they will be often sent as pure > acknowledgements. > This implies that ADD_ADDR are sent unreliably, which could be > problematic when the ADD_ADDR is required to allow the establishment of > additional subflows, as in load balancing scenarios. > We propose to rely on the "E" (Echo) flag in the ADD_ADDR option. > This echo flag is used to acknolwedge a received ADD_ADDR by echoing it. > If the acknowledgement is not received, the ADD_ADDR option will be > retransmitted up to N times. > I have several comments on this. Please let me know if I miss something. 1: Do we really need ADD_ADDR reliability in all cases? An end node might want to send ADD_ADDR for 'just in case' rather than for "I want you to use this" BTW, I'm not sure if the draft tries to replace the current ADD_ADDR or to propose an additional ADD_ADDR option. 2: The sender cannot be sure whether the info in ADD_ADDR will be used or not. It depends on the peer's decision. I might prefer re-transmitting ADD_ADDR up to N times when the sender doesn't receive MP_JOIN to the address for a certain amount of time. 3: "the receiving host MUST return the exact option.." Although it is MUST, can we always do this? There might be a situation where there is no option space or no segment to send. Thanks, -- Yoshi
- Re: [multipathtcp] Multipath TCP Address advertis… Yoshifumi Nishida
- Re: [multipathtcp] Multipath TCP Address advertis… Alan Ford
- Re: [multipathtcp] Multipath TCP Address advertis… Yoshifumi Nishida
- [multipathtcp] Multipath TCP Address advertisemen… Fabien Duchêne
- Re: [multipathtcp] Multipath TCP Address advertis… Alan Ford
- Re: [multipathtcp] Multipath TCP Address advertis… Yoshifumi Nishida
- Re: [multipathtcp] Multipath TCP Address advertis… Christoph Paasch
- Re: [multipathtcp] Multipath TCP Address advertis… Juliusz Chroboczek
- Re: [multipathtcp] Multipath TCP Address advertis… Fabien Duchêne
- Re: [multipathtcp] Multipath TCP Address advertis… Alan Ford