Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets
Fernando Gont <fgont@si6networks.com> Thu, 17 April 2014 22:54 UTC
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Date: Thu, 17 Apr 2014 19:43:44 -0300
From: Fernando Gont <fgont@si6networks.com>
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To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Fernando Gont <fernando@gont.com.ar>
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Cc: "6tisch@ietf.org" <6tisch@ietf.org>, "6man@ietf.org" <6man@ietf.org>, roll <roll@ietf.org>, Ines Robles <mariainesrobles@googlemail.com>
Subject: Re: [Roll] [6tisch] Support of flow label to carry the RPL information in data packets
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Hi, Brian, On 04/17/2014 05:31 PM, Brian E Carpenter wrote: >> >> On 04/17/2014 11:27 AM, Pascal Thubert (pthubert) wrote: >>> Considering the support we have at 6TiSCH and ROLL for the work, I >>> published draft-thubert-6man-flow-label-for-rpl-00.txt to the 6MAN WG. >>> >>> The main discussion is probably to confirm whether our proposed use of >>> the flow label inside the RPL domain is compatible with the goals that >>> are achieved by RFC6437. Let us continue the discussion there from now on. >> >> I just skimmed through the I-D. Two quick questions: >> >> 1) Does your document propose/require that the Flow Label be rewritten >> by some border router? -- I ask because, at the time, there was strong >> opposition to this. > > It was of course contested, but we have to remember that the flow label > is an unauthenticated field, so our interpretation of it has to be > robust against altered values. RFC 6437 indeed covers the case where a > forwarding node sets the flow label. FWIW, I was just asking to get an overall/quick understanding of where they wanted to go, and contrast that where 6man seemed to want to go at the time. Just that. IHMO, if the point/use case is valid, we should "evaluate" their proposal (i.e., by no means I was meaning "6man doesn't like that, forget it".) >> 2) Does the algorithm/scheme with which you'll rewrite the Flow-Label >> lead to predictable sequences? And/or, would the resulting values have a >> uniform distribution? > > The same part of RFC 6437 does RECOMMEND a uniform distribution. Agreed. Again, I was checking the extent to which they might be deviating from that was set here. Thanks, -- Fernando Gont SI6 Networks e-mail: fgont@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
- [Roll] Support of flow label to carry the RPL inf… Pascal Thubert (pthubert)
- Re: [Roll] [6tisch] Support of flow label to carr… Michael Richardson
- Re: [Roll] [6tisch] Support of flow label to carr… Tom Phinney
- Re: [Roll] [6tisch] Support of flow label to carr… Prof. Diego Dujovne
- Re: [Roll] [6tisch] Support of flow label to carr… Qin Wang
- Re: [Roll] [6tisch] Support of flow label to carr… Ines Robles
- Re: [Roll] [6tisch] Support of flow label to carr… Xavier Vilajosana
- [Roll] [6tisch] Support of flow label to carry th… Pascal Thubert (pthubert)
- Re: [Roll] [6tisch] Support of flow label to carr… Fernando Gont
- Re: [Roll] [6tisch] Support of flow label to carr… Pascal Thubert (pthubert)
- Re: [Roll] [6tisch] Support of flow label to carr… Brian E Carpenter
- Re: [Roll] [6tisch] Support of flow label to carr… Fernando Gont
- Re: [Roll] Support of flow label to carry the RPL… Yvonne-Anne Pignolet
- Re: [Roll] [6tisch] Support of flow label to carr… Brian E Carpenter
- Re: [Roll] [6tisch] Support of flow label to carr… Pat Kinney
- Re: [Roll] [6tisch] Support of flow label to carr… Pascal Thubert (pthubert)
- Re: [Roll] [6tisch] Support of flow label to carr… Brian E Carpenter
- Re: [Roll] [6tisch] Support of flow label to carr… Pascal Thubert (pthubert)
- Re: [Roll] [6tisch] Support of flow label to carr… Brian E Carpenter