RE: [DNA-BOF] Do we need a separate DAD Problem Statement? (was Re:About Charter, DAD, and SEND)

[Soohong Daniel Park <soohong.park@samsung.com>]

> > To check IP layer connection (network attachment), a node 
> > should check wheter
> > 1) it has reachable default router.
> > 2) it has valid IP address.
> > 
> > I agree that the check of 2) and the (optimistic) use of 
> > previous IP address can be done before DNA has 
> > been completed.
> > But, I am not sure that DAD optimization (new IP address
> > configuration while reducing the delay) can be done before
> > DNA has been completed. Do you think it can?
> 
> I'm not sure if we can use the global addres optimistically
> or not (I haven't finished thinking about it).

valid IP address means both link-local address and global address.
I guess we have to distinguish from them.

> I'm pretty sure that we shouldn't do DAD for a global
> address unless the link had changed (and the global address
> wasn't valid). This implies DNA completion (although
> configuring a new address may be applicable as soon as a new
> prefix is received).

By this mention, I can summarize as follows
1) optimized DAD for link-local address can be done before DNA
2) optimized DAD for global address can be done after DNA

Correct ?
 
> For the link-local address, I think we can say that we don't
> need to wait to hear what DNA says, since I may want to use an
> Optimized DAD procedure so I have a link-local address for use
> in DNA (for neighbour discovery for example).
> 
> Do you agree with the distinction?

What about this distinction ?
Optimized DAD procedure;
1) optimized DAD for link-local address before DNA
2) obtaining link-local address and completing DNA
3) obtaining global address informations (prefix...)
4) composing global address
5) optimized DAD for global address ( or skipping)

Am I missing something ?

Daniel