Re: problem statement [was Re: New Version Notification for draft-hinden-ipv4flag-00.txt]

Lorenzo Colitti <lorenzo@google.com> Mon, 20 November 2017 01:16 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 20 Nov 2017 10:16:11 +0900
Message-ID: <CAKD1Yr3UpNEOrf5tAf=8rWrRHu+hFVyH6DBuPR2gdS2j9bvkXw@mail.gmail.com>
Subject: Re: problem statement [was Re: New Version Notification for draft-hinden-ipv4flag-00.txt]
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Nick Hilliard <nick@foobar.org>, IETF IPv6 Mailing List <ipv6@ietf.org>
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On Mon, Nov 20, 2017 at 4:28 AM, Brian E Carpenter <
brian.e.carpenter@gmail.com>; wrote:

> The hypothesis of this draft is that there is no IPv4 support, hence
> nobody to send a DHCP(v4) reply.
>
> otoh, unable to resist solutionism even in this thread, a minor update
> to RFC2131 would allow battery-powered devices to slow down the
> DHCPDISCOVER rate as much as they want to.
>

I don't think the backoff schedule of current clients is dictated so much
by RFC2131 (e.g., Android already uses 120 seconds instead of 64) as it is
by operational expectations: if IPv4 appears you probably want to start
using it after a reasonable amount of time. In the absence of explicit
indication from the network, is it reasonable to back off sending
DHCPDISCOVER to once per hour? Day? Week? Year?