Re: [multipathtcp] AD review is coming
Alan Ford <alan.ford@gmail.com> Mon, 15 April 2019 16:55 UTC
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From: Alan Ford <alan.ford@gmail.com>
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Date: Mon, 15 Apr 2019 17:55:11 +0100
In-Reply-To: <11187BAE-5E91-410D-9BDA-33F8A60D2458@kuehlewind.net>
Cc: draft-ietf-mptcp-rfc6824bis.all@ietf.org, multipathtcp@ietf.org
To: Mirja Kuehlewind <ietf@kuehlewind.net>
References: <11187BAE-5E91-410D-9BDA-33F8A60D2458@kuehlewind.net>
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Subject: Re: [multipathtcp] AD review is coming
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Hi Mirja, To be clear, you are looking for some rationale in the draft text as well? The technical discussion of the fallback process is given in Section 3.1: The MP_CAPABLE exchange in this specification (v1) is different to that specified in v0 [RFC6824]. If a host supports multiple versions of MPTCP, the sender of the MP_CAPABLE option SHOULD signal the highest version number it supports. In return, in its MP_CAPABLE option, the receiver will signal the version number it wishes to use, which MUST be equal to or lower than the version number indicated in the initial MP_CAPABLE. There is a caveat though with respect to this version negotiation with old listeners that only support v0. A listener that supports v0 expects that the MP_CAPABLE option in the SYN-segment includes the initiator's key. If the initiator however already upgraded to v1, it won't include the key in the SYN-segment. Thus, the listener will ignore the MP_CAPABLE of this SYN-segment and reply with a SYN/ACK that does not include an MP_CAPABLE, thus leading to a fallback to regular TCP. An initiator MAY cache this information about a peer and for future connections, MAY choose to attempt using MPTCP v0, if supported, before recording the host as not supporting MPTCP. But you would like to see some discussion mentioning the migration from Experimental to Proposed Standard? And the benefits it brings? Would that cover it? Many thanks, Alan > On 12 Apr 2019, at 17:40, Mirja Kuehlewind <ietf@kuehlewind.net> wrote: > > Hi authors, hi shepherd/Phil, > > Just wanted to quickly let you know that I’ve started the IETF last call just now in order to hopefully get this document on the telechat in 3 weeks. > > I’ve not finished my AD review completely but I am nearly done and convinced that this doc is ready to start IETF last call. So far I have only some editorial or smallish comments and nits which I will send in detail beginning of next week and can be address during or after IETF last call. > > Only one request for now (mostly with an eye on the IESG evaluation): The draft says that changes are made which are not backward compatible (see sec 3.1). That’s fine, however, it would be good to also explain a little bit in the draft as well as in the shepherd write up (!) why this is okay. My understanding is that in case of a v0 server the connection will “just" fall-back to non-MPTCP capable and that this is acceptable in current deployment situation. Please confirm and at least update the write-up accordingly as soon as possible! > > Thanks! > Mirja > > >
- [multipathtcp] AD review is coming Mirja Kuehlewind
- Re: [multipathtcp] AD review is coming Alan Ford
- Re: [multipathtcp] AD review is coming Mirja Kuehlewind
- Re: [multipathtcp] AD review is coming Olivier Bonaventure
- [multipathtcp] AD review detailed comments [was: … Mirja Kuehlewind
- Re: [multipathtcp] AD review is coming philip.eardley