Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com> Wed, 08 May 2019 10:52 UTC

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To: ipv6@ietf.org
Subject: Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05
From: Philip Homburg <pch-ipv6-ietf-6@u-1.phicoh.com>
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In-reply-to: Your message of "Tue, 7 May 2019 21:53:26 -0400 ." <37964E60-0B8D-4287-9933-DCC1025030A7@gmail.com>
Date: Wed, 08 May 2019 12:52:12 +0200
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> I am glad that we added the option to disable the flag and only
> enable when ready and on managed networks as I agree on unmanaged
> this flag really does not apply.

The draft discusses battery lifetimes. In general battery operated devices
move between managed and unmanaged network. So what is the correct setting?

Is there a way to signal to a host that it is on a managed network in 
some secure way? If there is add a reference to such a protocol in the
draft and explcitly say that the host MUST NOT act upon the flag if it is
in an unmanaged environment. And then what, what does a mobile device do
on an unmanaged network? Probably device vendors will find ways to reduce
IPv4 traffic to a point where battery use is left in the noise.

Then assume a managed network. These networks have RA-guard and can most
likely filter IPv4 at the ethernet level. Is the remaining traffic worth
filtering?

So where do you need this draft and what impact does it have?