Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)

Mark Smith <markzzzsmith@gmail.com> Fri, 08 November 2019 21:50 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Sat, 9 Nov 2019 08:50:07 +1100
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To: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>
Cc: v6ops list <v6ops@ietf.org>
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Subject: Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)
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One of the best questions to often ask is "why?"

On Sat, 9 Nov 2019, 01:20 Philip Homburg, <pch-v6ops-9@u-1.phicoh.com>
wrote:

> > Probably there is no formal requirement for prefixes to be stable
> > across crashes and reboots[*], but there is a behaviour of the
> > client to send CONFIRM after reboot or wake-up from sleep, as
> > described in the RFC DHCPv6.
>
> Sending a CONFIRM after a reboot requires that the client writes the
> lease to presistant storage.
>
> As far as I know, there is no requirement for clients to have suitable
> persistent storage.
>
> Of course, the big issue is: do we want to delay IPv6 by making IPv6
> deliberately incompatible with common IPv4 deploy strategies?


Why do you think that this "strategy" exists in IPv4 deployments?

Why is it relevant and preferable today for IPv6?

Why is it best for IPv6 when people get something different in IPv6 than in
IPv4 - public address space to use on their LAN.



If the answer
> is that we don't care about IPv6 roll-out, then indeed there is no need
> to fix this scenario.
>
> There are other scenarios, but I believe they should be fixed in the host.
> Or not at all, if we also declare those operational errors.
>
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