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

Fred Baker <fredbaker.ietf@gmail.com> Wed, 22 November 2017 00:35 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Subject: Re: problem statement [was Re: New Version Notification for draft-hinden-ipv4flag-00.txt]
Date: Tue, 21 Nov 2017 16:35:38 -0800
References: <151090059151.22321.3357672601322845792.idtracker@ietfa.amsl.com> <E838C63E-7612-4AA4-9375-854C184D699E@gmail.com> <CAFU7BAQKoWPcEFQZgU3k_d0gUL4en6d2pyNq1V4RMNZ6HrSG8w@mail.gmail.com> <649be36e-5006-7688-448f-bc2794d6a39c@gmail.com> <CAKD1Yr3WC+vwL_=0PeiJ_D85NqFVTCkb8c83x-ZtGhAbSELGMA@mail.gmail.com> <5A119443.2030108@foobar.org> <CAFU7BASwgLfkO-4kk9-vba_P+jmcFHD5+Hy_7b3cnNkOSv30wg@mail.gmail.com> <CAKD1Yr3pKk22Hkxy4_8YMZYiA4Wwp=6JzdRDKFGdTY1gf=ntfA@mail.gmail.com> <alpine.DEB.2.20.1711200848390.32099@uplift.swm.pp.se> <5A12FBE4.9030101@foobar.org> <alpine.DEB.2.20.1711210647151.32099@uplift.swm.pp.se> <5A144A78.6060108@foobar.org> <CAKD1Yr3oQvkSX7ARxfGQVg08=-PTKRFPg1wz_zUKSSAHmMbyMA@mail.gmail.com> <5A14A9A1.5020803@foobar.org> <ea9f56bb-2334-5a5a-9026-d45c74b41d4b@gmail.com> <5A14C38B.1070809@foobar.org>
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I read through the thread and part of the draft. I think there is a fundamental issue.

>    This document specifies a Router Advertisement Flag to indicate that
>    there is no IPv4 service on the advertising router.

That doesn't tell the receiver anything about other routers, and especially IPv4-only routers that might exist in the environment. I don't think one can conclude from the receipt of an RA, or for that matter every RA from every IPv6-capable router in the environment, that there is no IPv4 service in the environment. One might conclude that from the lack of a response to a DHCP request for an IPv4 address. What I would expect the host to do is an exponential backoff to only asking for an address every mumble minutes, which would be lost in the noise.

I don't see the point.