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

[Greg Daley <greg.daley@eng.monash.edu.au>]

Hi Alper,

Alper Yegin wrote:
>>>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.

You're right about the scenario.

I think that we have to at least keep
multilink in the back of our mind,
but I would like to find a solution which
is multilink-agnostic.

We may be able to check that the solutions
work (in principle) with multilink,
but I'd prefer to leave that on the side
(leave that out of the explicit scope)
unless multilink subnets are actually
moving towards standards track.

Greg