RE: [DNA] DNAv6 Review from Mobopts

[Bernard Aboba <bernard_aboba@hotmail.com>]

> The problem is that regular ND doesn't talk much about how to
> determine if a host's existing address is still valid. As of my
> knowledge, there are two ways in ND,
> 1) check whether the prefix of the address is advertised in the
> currently attached link.
> 2) check whether an existing default router is still reachable.
> 
> 1) gives a problem in multi-link subnets as you pointed out.
> 2) gives a problem because of link-local scope of router address.

For ND detection, you need to check the MAC address as well.  That way
the existence of the same link-scope address on multiple links is not
an issue. 
 
> thanks for your sharing ideas with us. I wish you would also comment
> on the existing simple DNA solution to facilitate its advancement.

At first look, Simple DNA does not seem to have these issues because
it can support fast reuse of DHCPv6-assigned addresses, and also because
it can function even when no prefix is advertised in the RA.