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Re: [homenet] Please review the No IPv4 draft

Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> Tue, 15 April 2014 14:07 UTC

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Date: Tue, 15 Apr 2014 16:07:01 +0200
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From: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
To: Simon Perreault <simon.perreault@viagenie.ca>
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Archived-At: http://mailarchive.ietf.org/arch/msg/homenet/O9zeBvS5PvCpWnzbgzMjpmyTd-w
Cc: homenet@ietf.org
Subject: Re: [homenet] Please review the No IPv4 draft
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> We are soliciting reviews for this SUNSET4 draft:
>
> http://tools.ietf.org/html/draft-ietf-sunset4-noipv4-00
>
> In a nutshell, it defines DHCPv6 and RA options indicating to the host
> that IPv4 is not available.

It seems to me that options relating to IPv4 don't belong in RA/DHCPv6
-- they belong in DHCPv4.  Having a degenerate DHCPv4 server that just
NAKs every request would appear to solve all of the problems in Section 3.
The main point is that having a dedicated DHCPv4-NAK-ing server avoids
the need to configure all IPv6 routers with IPv4-related information
-- a serious operational concern if you have many IPv6 routers on a single
link.

(To be fair, you might need a new DHCPv4 option that says "do not try
to contact any other DHCPv4 servers" to solve your problems 3.1/3.2.
But then, I'd like to see some operational experience that shows that it
is a problem in practice.)

-- Juliusz (who wishes people would stop dumping gazillions of unrelated
            options into existing protocols)

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