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

Lorenzo Colitti <lorenzo@google.com> Wed, 22 November 2017 09:37 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 22 Nov 2017 18:37:11 +0900
Message-ID: <CAKD1Yr38gfHNYokWY3M1+Lh3jypSub669PjFo-1MyVSQp7EGZg@mail.gmail.com>
Subject: Re: problem statement [was Re: New Version Notification for draft-hinden-ipv4flag-00.txt]
To: Nick Hilliard <nick@foobar.org>
Cc: IETF IPv6 Mailing List <ipv6@ietf.org>
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On Wed, Nov 22, 2017 at 7:33 AM, Nick Hilliard <nick@foobar.org>; wrote:

> > On Wed, Nov 22, 2017 at 12:47 AM, Nick Hilliard <nick@foobar.org>; wrote:
> > > There would also be a requirement
> > > for the network edge to be able to filter out RAs with this option,
> >
> > Why is it not sufficient to configure the routers that emit the RAs?
>
> because you're assuming congruity between ipv4 and ipv6 connectivity on
> a network, which is not codified in any ietf document that I'm aware of.
>  If there is a incongruity between management of the two protocols, then
> the l2 network must have a mechanism to stop an ipv6 gateway from
> attempting shutting down ipv4 services.
>

I don't get it. That's a configuration error. If the operator misconfigures
the network, then the network doesn't work.

Sure, the proposed solution won't work when IPv4 and IPv6 are managed by
different operators. That doesn't seem like a big drawback, since this
situation is quite rare.