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

[Jan Zorz - Go6 <[e-mail]>]

On 05/02/2019 13:10, Philip Homburg wrote:
>> The problem starts when the ISP wants to change prefixes.
>>
>> How often will they really need to do that?
>>
>> I think a lot of this need in IPv4 has come from IPv4 addresses being
>> precious and expensive resources. Consequently, it has been worth the
>> expense and effort of fine grained management of them.
>>
>> In IPv6, that level of management isn't needed. Addresses are plentiful and
>> cheap, so you can throw lots of address space at problems.
> 
> Ideally every customer just gets a static /48. There is no technical reason
> why this can't be made to work.

Agreed 100% :)

> 
> Reality is that ISPs have lots of reasons to do things differently. I don't
> think we are in position to tell ISPs that they are doing it wrong. 

Hmm. We could be in a position to tell them they are doing it wrong - if 
they are doing it wrong :) And clearly - they are doing it wrong, 
otherwise things would work and we would not have this conversation ;)

We need to make sure operators stop cutting corners and dragging bad 
practices from IPv4 into IPv6 world and things will get better.

> Reality
> is also that in lots of markets there is little competition. So if an ISP
> does something weird, customers are stuck with it.

We need to fix this before people start pulling IPv4 out of their 
networks. Today we have another protocol that saves our day if things 
goes wrong, but when IPv4 is out of our backbones and access networks - 
all this little failures will show much more prominently.

Cheers, Jan