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

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

On 19/02/2019 08:56, Jen Linkova wrote:
> Lets say there are two routers (R1 and R2) on the LAN.
> R1 advertised 2001:db8:1::/64 and 2001:db8:3::/64
> R2 advertised 2001:db8::2::/64 and 2001:db8:3::/64.
> 
> Hosts have addresses from 3 prefixes.
> Now R2 stops advertising 2001:db8:3::/64.
> 
> There is no reason for hosts to deprecate addresses in 2001:db8:3::/64.

Dear Jen,

In theory you are correct.

In practice - at residential home or SOHO environment we rarely see a 
corner case that you described. I'm not saying it's incorrect, but I 
would say - very very rare.

We really need to address the big elephant in the room first and enable 
operators to deploy IPv6 on a massive scale in architectural way that 
they choose. We ignored it for too long now. :)

Cheers and thnx, Jan

P.S: I hope that we can have this discussion at IPv6 WG meeting at RIPE 
in Reykyavik in May and bring some additional operational feedback to 
this mailing list ;)