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Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option

Lorenzo Colitti <lorenzo@google.com> Thu, 05 December 2019 09:12 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 05 Dec 2019 18:11:59 +0900
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To: "<mohamed.boucadair@orange.com>" <mohamed.boucadair@orange.com>
Cc: Jen Linkova <furry13@gmail.com>, Bjørn Mork <bjorn@mork.no>, "dhcwg@ietf.org" <dhcwg@ietf.org>, V6 Ops List <v6ops@ietf.org>, "draft-link-dhc-v6only@ietf.org" <draft-link-dhc-v6only@ietf.org>
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Subject: Re: [v6ops] [dhcwg] IPv6-Only Preferred DHCPv4 option
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On Thu, Dec 5, 2019 at 5:58 PM <mohamed.boucadair@orange.com> wrote:

> IMO, a host will need to “pause” the v4 configuration for xxx ms to make
> sure the configuration (v4/v6) is consistent.
>

Hosts do not do this today, and I don't think they will start doing so. The
reason is that they cannot tell whether another protocol will start
working. If they wait xxx ms to make sure the other protocol comes up, they
are slowing down all connections to single-stack networks by xxx ms, making
their users unhappy.

Note that IPv6 has built-in delays in the protocol itself (DAD for the
link-local address; various randomized delays) that make it very difficult
to get anything done before at least 1-2 seconds have passed. Hosts that
know that 70% of networks are IPv4-only will not want to wait 1-2 seconds
to connect to those networks.

>

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