RE: [DNA] Prefix information for link identification in DNA

["Tero Kauppinen (JO/LMF)" <tero.kauppinen@ericsson.com>]

> > James Carlson has recently pointed out that there really is no
intrinsic
> > reason why DNA cannot be applied to networks without a router, and
has
> > proposed modifications to DNAv4 to allow this. James has proposed
that
> DNA
> > be able to use any peer that is known to be stable as an indicator
of
> > network attachment.  This could be a router, or it could be another
> device.
> > About the only fundamental limitation is that "network anchor"
probably
> > shouldn't obtain its address dynamically.
> 
> DNA aims to ascertain the validity of its IP configuration for
> Internet connectivity, such as valid IP address or default router. So,
> when a host's IP configuration is no longer valid, it can quickly
> perform proper procedures, such as getting CoA and sending BU, to
> re-establish IP connectivity.
> 
> However, in case of a link without a router, I wonder what IP
> configuration parameter a host need to  verify for Internet
> connectivity. Also I have difficulty finding out what is the use of
> DNA in such a link.

How can it be made sure that if the node moves from one adhoc network to
another the "network anchor" identities won't happen to be the same?
After all there is no communication between these two networks. Surely
it can be made unlikely to happen by constructing the identity of
several components, but the probability would still exist. I can't stop
thinking the original simple idea of adding an identifier to the RA, but
unfortunately it had this shortcoming that it was not possible (other
than manually configuring) to make sure that adjacent networks don't use
the same identifier.

I'm also a bit worried about possible complications to the protocol if
transition from networks including a router to a network that doesn't
have a router will be supported. I would guess the transition other way
around is simpler, because when sending an RS upon detecting "link up"
the node will receive an RA.

Tero