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

["Joel M. Halpern" <[e-mail]>]

I was trying to think through what breaks if you do the below.
The one case I can see is if there is an open TCP connection using the 
prefix to be dropped.  If that TCP connection appears to be working, 
then dropping the prefix would seem harmful.  It would also seem that if 
the TCP connection is working that would be evidence that there is no 
need to drop the prefix.

Yours,
Joel

On 2/19/19 10:59 PM, Fernando Gont wrote:
,,,
> This is not the way the proposed algorithm work.
> 
> I'd agree with you that if you stopped receiving RAs, *that* wouldn't
> necessarily warrant a prompt reaction.
> 
> However, the proposed algorithm reacts to *RAs from the same router*
> (i.e. the router *is alive*) that do carry PIOs, but they happen to
> advertise PIOs for different prefixes.
> 
> Once you receive four RAs with PIOs from the same router, all of them
> including PIOs, but failing to advertise the stale prefix, you remove
> the addresses.
,,,