Re: [lp-wan] re-order header field request

Laurent Toutain <laurent.toutain@imt-atlantique.fr> Wed, 21 June 2017 08:10 UTC

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From: Laurent Toutain <laurent.toutain@imt-atlantique.fr>
Date: Wed, 21 Jun 2017 10:09:12 +0200
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To: Carles Gomez Montenegro <carlesgo@entel.upc.edu>
Cc: Arun <arun@ackl.io>, lp-wan <lp-wan@ietf.org>
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Subject: Re: [lp-wan] re-order header field request
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Hi,

I don't think it is a problem to keep it, in a All 1 Frag, even if we don't
use it (MIC is out of window numbering).  we have alignment on bytes when
we send a message, so the benefit is not obvious if we don't keep it.

But in  ACK message the W bit must be present.

Laurent

On Wed, Jun 21, 2017 at 10:02 AM, Carles Gomez Montenegro <
carlesgo@entel.upc.edu> wrote:

> Hi Arun,
>
> The point here is that the Rule ID field in fragments except the last one
> will not use the W bit (or equivalently, have one bit less than the Rule
> ID field in the last fragment as per current formats).
>
> So I'm wondering if this "additional bit" in the Rule ID of the last
> fragment could have any useful purpose or not, or conversely would just
> complicate the structure and uniformity of fragmentation headers.
>
> Thoughts?
>
> Cheers,
>
> Carles
>
>
>
> > Hi Carles,
> >
> >  Having the uniform header format seems to be an ideal solution but
> > Tx'ing additional bit without any significance seems contentious.
> > Will wait for more feedbacks or comments :)
> >
> > thanks,
> > Arun
>
>
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