> >     What if different RAs received on the same interface contain
> >     different DNS information?
> > 
> 
> For that last point, IMHO, DNS information transported in a RA should be
> associated to the prefix annouced in that RA. If several RA advertise
> several prefixes with different DNS information it's a matter of policy
> management on the host. Am I wrong ?

That doesn't work with the normal way to implement things.
DNS information on a node is global - it isn't and can't be associated
with an interface in any implementation I know of.

Furthermore, associting anything received in an RA with the sender or
prefix(es) of that particular RA is not consistent with the model even in
neighbor  discovery (the prefixes advertised vs. default router selection are
separate) let alone shouldn't be visible to higher levels of the stack.

While one could revisit these aspects of the IP architecture I'd be leery of
making IPv6 different than IPv4 in these respects.

  Erik

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