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Re: Reducing the battery impact of ND

Lorenzo Colitti <lorenzo@google.com> Thu, 30 January 2014 18:39 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 30 Jan 2014 10:38:50 -0800
Message-ID: <CAKD1Yr2RDNqL8ERr+5t7MUY7c2S_YneNYX4Pt4z+T0yHWM10bg@mail.gmail.com>
Subject: Re: Reducing the battery impact of ND
To: Erik Nordmark <nordmark@acm.org>
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Cc: 6man Chairs <6man-chairs@tools.ietf.org>, Andrew Yourtchenko <ayourtch@gmail.com>, 6man WG <ipv6@ietf.org>
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On Wed, Jan 29, 2014 at 10:20 PM, Erik Nordmark <nordmark@acm.org> wrote:

> The frustrating thing is that the same folks that argue that the WG
> shouldn't work on a different design (targeting multicast challenged
> links), keep on suggesting tweaks. If the WG thinks we should work on
> improving ND for such links (and perhaps also improve it for battery
> operated hosts), then let's do that work. If not, then let's stop
> suggesting tweaks.
>

What tweaks are we talking about? The major change that's being suggested
here is to increase the robustness of initial attach by changing "try three
times and then give up" to "exponential backoff". I don't think anyone
disagrees with that, right?

As for unicast RAs, that's an operational issue. The specs allow it, and as
Ole says, before going and changing the specs, we should hear (perhaps from
v6ops?) that this is a real-world problem, and that changing the specs is
the only or best way to fix that problem.

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