Re: [Snac] Relax the requirement on a single 'root' ULA prefix generated by stub router?

[Erik Auerswald <[e-mail]>]

Hi,

On Fri, Aug 25, 2023 at 03:08:05PM +0200, Erik Auerswald wrote:
> On Thu, Aug 24, 2023 at 11:49:12AM +0000, Esko Dijk wrote:
> > 
> > Thanks for the summary of points.
> > 
> > > A host implementing the RFC 6724 section 10.6 procedure would detect
> > >    the stub router's 48-bit ULA prefix on the AIL as local.  
> > 
> > If there are say N stub routers, each with own stub network, there
> > would be N different ULA prefixes.
> > [...]
> > We assume also that the case of one auto-assigned ULA prefix and one
> > GUA prefix on the AIL is not applicable, since the stub router only
> > assigns the ULA prefix if there's nothing else already assigned.
> 
> [...]
> Always using a single ULA prefix per stub network, combined with
> advertising a subnet from this ULA prefix on the AIL as on-link, could
> be an additional method to also support RFC 4191 type A/B hosts that
> implement RFC 6724 section 5 rule 5.5.  Such a host would use a ULA from
> the stub network's prefix as source address, and would use a stub router
> connected to that sepcific stub network.

I made a mistake here, this would not work.  I thought about selecting
the gateway after selecting the source address, but "rule 5.5" selects
the source address after the gateway has been selected.

Best regards,
Erik