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

Ted Lemon <mellon@fugue.com> Fri, 08 November 2019 15:30 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Fri, 08 Nov 2019 16:30:31 +0100
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To: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>
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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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why would we have to delay deployment?

> On Nov 8, 2019, at 15:20, 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? 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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