Re: [DNA-BOF] Detecting Network Attachment BoF description (rev 2)

[Thomas Narten <narten@us.ibm.com>]

Alper Yegin <alper@docomolabs-usa.com> writes:

> >> Or, host might change its access point and consequently access router, but
> >> the two routers might be advertising the same prefix. In that case, IP
> >> address of the host does not change, but default router information must
> >> change. So, even if the subnet does not change, host has to react to
> >> this.
> > 
> > Does it? I assume that the AR is the default router on the link. If
> > the AP changes, but the AR does not, why is this visible to IP? It
> > doesn't need to be.

> Imagine both the access point and the access router changes. But the
> previous and new access routers are in the same multi-link, hence they are
> advertising the same prefix. Host has to change its forwarding table and
> neighbor cache by adding the new default router. But host does not have to
> change its IP address.

In what way and why?

Note: I don't know what a mulitlink subnet is, as we don't have a
crisp definition, so I don't know what its properties or the
implications of a node moving from one part of the multi-link subnet
to another one.

Thomas