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Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

Lorenzo Colitti <lorenzo@google.com> Thu, 05 December 2019 15:11 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Fri, 06 Dec 2019 00:11:41 +0900
Message-ID: <CAKD1Yr2oQLTfviSQC+jeNmaYZROq31PXnQgoMHrL0DiGa6WWEQ@mail.gmail.com>
To: Roy Marples <roy=40marples.name@dmarc.ietf.org>
Cc: "<mohamed.boucadair@orange.com>" <mohamed.boucadair@orange.com>, "dhcwg@ietf.org" <dhcwg@ietf.org>, V6 Ops List <v6ops@ietf.org>, Bjørn Mork <bjorn@mork.no>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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On Fri, Dec 6, 2019 at 12:01 AM Roy Marples <roy=
40marples.name@dmarc.ietf.org> wrote:

> IPv4 has built in delays as well. DHCP delay randomisation and DAD
> timings via RFC 5227.
> NetBSD has RFC 5227 in the kernel and works very nicely.
>

True. Coincidentally, we've actually been finalizing an implementation
<https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1095791>
in
the last few weeks. The current client just sends a DISCOVER as soon as it
possibly can and takes the first offer it gets.


> I once saw a PDF that claimed Solaris does the same, although my hands
> on experience says if it does work it uses timings different from the RFC.
>

IIRC we found the RFC timings to be way too long for mobile devices that
move between networks often, so we lowered them.

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