Re: A common problem with SLAAC in "renumbering" scenarios

[Ole Troan <[e-mail]>]

> On 20 Feb 2019, at 04:35, Fernando Gont <[e-mail]> wrote:
> 
>> On 20/2/19 00:11, Ole Troan wrote:
>> 
>> 
>>>> On 20 Feb 2019, at 03:50, Fernando Gont <[e-mail]> wrote:
>>>> 
>>>> On 19/2/19 10:08, Ole Troan wrote:
>>>> Nick,
>>>> 
>>>>> On 19 Feb 2019, at 13:57, Nick Hilliard <[e-mail]> wrote:
>>>>> 
>>>>> Ole Troan wrote on 19/02/2019 12:22:
>>>>>> Indeed. Wonder how these pesky mobile phone operators manage to
>>>>>> deliver the same telephone number to a user, for years. Across
>>>>>> different providers and contracts.
>>>>>> I can’t think this argument is anything but a strawman.
>>>>> 
>>>>> Ole,
>>>>> 
>>>>> if recommending static IP addressing is an idea that 6man wants to push, you'll need to reach out to the security and ops areas to get their input on this.  I'm not sure this is an issue that 6man can resolve fully.
>>>> 
>>>> It’s been the IPv6 addressing model for at least 20 years, so I think the other areas have had ample time to provide their input.
>>> 
>>> For the reasons stated in draft-gont-6man-slaac-renum, I don't think
>>> this affects the discussion we are having. But, out of curiousity,
>>> where's the "addressing model" you are referring to documented?
>> 
>> I can’t see slaac-renum tackling these issues.Which reasons are you referring to?
> 
> A significant percentage of IPv6 deployments don't employ static
> prefixes but dynamic prefixes. That's a deployment reality.

There’s a defined way to do IPv6 renumbering, which involves overlapping new and old prefixes. 
There seems to be some people arguing that renumbering without an overlap is a supported case in IPv6. It is not. 

That is although related, not the problem you are looking at. 

Ole


> 
> How you (or me) would like things to be doesn't change deployed reality.
> 
> Our I-D tries to deal with such deployed reality.
> 
> 
> 
>> With regards to the addressing model, your question shows a certain lack of history, but given that we all gave lived under the reigns of NAT for so long. 
> 
> You have been referring to an addressing model that implies
> static/stable addressing. I simply asked where that model is described.
> 
> If such requirement is not spelled out somewhere, I don't know why you'd
> refer to that as a model, or even why you could expect it.
> 
> Not sure how my question for a reference that backs your model can turn
> into something I'm supposed to be lacking, missing, or ignoring.
> 
> 
> -- 
> Fernando Gont
> SI6 Networks
> e-mail: [e-mail]
> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
> 
> 
> 
>