Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

[David Farmer <[e-mail]>]

On Fri, May 24, 2019 at 3:59 AM Nick Hilliard <[e-mail]> wrote:

> David Farmer wrote on 23/05/2019 23:13:
> > What he is saying is a dual-stack host that has functioning IPv6
> > should not enable IPv4 LL. And functioning IPv6 means at a minimum it
> > has learned an IPv6 GUA and probably a default router as well, you
> > could also test for connectivity beyond the default router, but that
> >
> > The risk this creates is that on a dual-stack network if a there is
> > an issue with the DHCPv4 server, such as it crashed or was
> > misconfigured then the dual-stack host cannot fall back to IPv4 LL
> > and will not be able to perform Link-Local communications with
> > IPv4-Only devices on the common link between them.
> >
> > Personally, I think this is an acceptable risk, but I'm not convinced
> > that there is a consensus that this is an acceptable risk. Therefore,
> > I'm not ok with abandoning the IPv6-Only flag until there is a
> > consensus that this is an acceptable risk.. Furthermore, we need more
> > than 6man's consensus on this risk.
>
> the usual ietf position is that operational misconfig - including
> daemons crashing - is out of scope for protocol development.  If it's
> out of scope, there's no real issue regarding consensus.
>
> Obviously, from an operational point of view, if DHCP service is
> important on a network, the operator is at liberty to install redundant
> servers / relays.
>

WHAT ARE ARE YOU SAYING?  The IETF SHOULD NOT concern itself with
accidental misconfiguration? And SHOULD only create fragile and brittle
protocols? The IETF SHOULD NOT seek robustness in its protocols?

If that is the case I think you just said half the work in V6OPS and GROW
is out of the scope of the IETF. And you just said your objection to the
IPv6-Only flag is out of scope. I believe just the opposite, and I believe
your objections to the original formulation of the IPv6-Only flag were well
placed.

Thanks




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