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

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

"JinHyeock Choi" <athene@sait.samsung.co.kr> 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.

> It seems that, in above, Alper means that both AR and AP change. This case 
> was dealt in 'p. 6, figure 2' in
> draft-daley-mobileip-movedetect-01.txt

If the two routers are advertising the same prefixes, that suggests to
me they are on the same IP link, and there is no need to change
routers (at the IP layer). That is, there is no movement at the IP
level.  (But I may be in danger of displaying a serious lack of
understanding of how APs and ARs interact and so forth.)

Thomas