Re: 6renum , NEMO, and others, alive again? [A common problem with SLAAC in "renumbering" scenarios]

[Alexandre Petrescu <[e-mail]>]

Le 20/02/2019 à 05:02, Brian E Carpenter a écrit :
> Maybe everybody could read up on previous rounds of discussion:
> 
> https://tools.ietf.org/html/rfc4192
> https://tools.ietf.org/html/rfc5887
> https://tools.ietf.org/html/rfc6866
> https://tools.ietf.org/html/rfc6879
> https://tools.ietf.org/html/rfc7010
> (In that last one, the section "Gaps Considered Unsolvable"
> might be of interest.)
> 
> Yes, the topic was site renumbering, not host renumbering. But
> the assumption has always been that renumbering should be a routine
> event in IPv6. (Those of us who had to manage IPv4 site renumberings,
> especially before the advent of DHCP, have always been sensitive on
> this topic.) Thus, hosts need to be ready for renumbering at any time,
> without notice.

Thank you for the pointer to 6renum.

In addition, the topic of prefix stability was addressed in mobility 
contexts by RFC3963 "Network Mobility".  That protocol works, but has, 
in some contexts, some issues related to "Route Optimization" RFC4888.

Another side node is the prefix stability addressed with BGP updates in 
Boeing and NASA demonstrator.

> Better I think to focus on Fernando's specific issue.

I agree, it is a very good issue.

In addition to household networks, assigning a stable prefix with 
DHCPv6-PD to a cellular phone, or to a car, are important for their 
respective networks.  I know of a cellular operator that does have a 
trial giving DHCPv6-PD to mobile user and to household network.  Its use 
eliminates the use of Network Mobility, when the prefix stays stable.

Alex

> 
> Regards
>     Brian Carpenter
> 
> On 2019-02-20 16:11, 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?
>>
>> 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. Allow me to turn it around. How do you expect the network to work with addresses being of arbitrary lifetime (the effect of flash renumbering) and where is that described? Start with a long-lived TCP session, with the listening peer sitting in one of these networks.
>>
>> Ole
>>
>>
>>>
>>> Thanks,
>>> -- 
>>> Fernando Gont
>>> SI6 Networks
>>> e-mail: [e-mail]
>>> PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
>>>
>>>
>>>
>>>
>>
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