Re: slaac-renum: Valid Lifetimes

Erik Kline <ek.ietf@gmail.com> Fri, 03 April 2020 05:28 UTC

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From: Erik Kline <ek.ietf@gmail.com>
Date: Thu, 02 Apr 2020 22:28:21 -0700
Message-ID: <CAMGpriUXNge=Ss7NwB_1H-WDfA-MFBfqNx1=WOnXxSaghJaR6g@mail.gmail.com>
Subject: Re: slaac-renum: Valid Lifetimes
To: Fernando Gont <fgont@si6networks.com>
Cc: "6man@ietf.org" <6man@ietf.org>
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Whatever values/scaling is decided for these and other values via the
slaac-renum effort I do think we should make sure it's still possible to
sensibly follow the 7772 guidelines.

On Thu, Apr 2, 2020 at 11:05 AM Fernando Gont <fgont@si6networks.com> wrote:

> Folks,
>
> We don't need to agree on this *now* (although it would be great! ;-) ),
> but I felt like polling the wg to get some input from you.
>
> In the current revision of our draft (draft-gont-6man-slaac-renum-05),
> we use the following default values for PIOs:
>
> * Preferred Time: Router Lifetime
> * Valid Time: 48 * Router Lifetime
>
> With the default Router Lifetime of 1800 seconds, the Valid Lifetime
> results in 1 day. This wasn't the value we were using in earlier
> versions of the draft, but based on feedback from Owen on the v6ops
> list, we decided to go this conservative value (since the specific value
> to use was a low-order bit of the draft).
>
> However, after discussing this with a number of developers from
> different OSes there seems to be agreement that this value Valid
> Lifetime is still to large, and that it would be more sensible to use
> something like: 2 * Router Lifetime  (which is still very conservative).
>
> Thoughts?
>
> Thanks!
>
> Cheers,
> --
> Fernando Gont
> SI6 Networks
> e-mail: fgont@si6networks.com
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>
>
>
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