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Re: [v6ops] IPv6-Only Preferred DHCPv4 option

Lorenzo Colitti <lorenzo@google.com> Wed, 04 December 2019 14:40 UTC

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References: <CAFU7BAR1JLUZps=CAqJfeQtUf-xQ88RYvgYrPCP+QP0Ter7YFg@mail.gmail.com> <8736e0gqu2.fsf@miraculix.mork.no>
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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 04 Dec 2019 23:40:09 +0900
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To: Bjørn Mork <bjorn@mork.no>
Cc: Jen Linkova <furry13@gmail.com>, dhcwg@ietf.org, draft-link-dhc-v6only@ietf.org, V6 Ops List <v6ops@ietf.org>
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Subject: Re: [v6ops] IPv6-Only Preferred DHCPv4 option
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On Wed, Dec 4, 2019 at 10:31 PM Bjørn Mork <bjorn@mork.no> wrote:

> Why can't the client just release the IPv4 address when it finds it has
> IPv6 connectivity?  This would also avoid the problems you introduce
> when the network falsely claims IPv6 support.
>

Doing this creates a bad user experience, because once an IPv4 address is
assigned to the device, apps immediately start using it. At that point,
taking the address away is disruptive, potentially causing user-visible
errors.

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