Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios

Fernando Gont <fgont@si6networks.com> Thu, 21 February 2019 01:49 UTC

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To: j h woodyatt <jhw@conjury.org>, "6man@ietf.org" <6man@ietf.org>, IPv6 Operations <v6ops@ietf.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Wed, 20 Feb 2019 22:40:44 -0300
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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Hi, James,

Thanks for thre great feedback! Comments in-line...

On 20/2/19 14:09, j h woodyatt wrote:
> On Jan 31, 2019, at 03:00, Fernando Gont <fgont@si6networks.com>
> wrote:
>> 
>> https://tools.ietf.org/html/draft-gont-6man-slaac-renum
> 
> For the record, I agree with the authors that reducing the default
> values for AdvPreferredLifetime and AdvValidLifetime is an idea with
> merit.
> 
> The other changes seem less obviously good, as they resemble previous
> unsuccessful attempts to hammer the DHCPv6 and Router Discovery
> protocols into resembling a proper routing protocol, which they are
> not, and which I think we should admit they never will be. Having
> experienced the futility in attempting to improve Router Discovery
> and/or DHCPv6 to resemble a proper routing protocol, I would say I’ve
> seen better and more elegant solutions to these problems, which
> unfortunately all depend on host operating systems adopting the model
> that hosts sometimes have cause to participate in the network routing
> protocol. As this idea has never been taken seriously by the
> community, I think it’s probably best to leave it behind.

Note: 5.1.3 allows for more timely recovery from the aforementioned
problem. (otherwise you'd have to wait longer, or reduce timers more
agressively)

5.1.2, 5.2, and 5.3 aims at network devices behaving nicely, possibly
allowing for timely recovery of hosts that don't implement 5.1.3.


> 
> Shorter james: keep section 5.1.1 and drop sections 5.1.2, 5.1.3, 5.2
> and 5.3.

Seems folks wanted these bits about "how devices should play nice"...

Thanks!

Cheers,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
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