Re: [DNA] [Issue 15] [Issue 16] DAD and MLD Interaction

[Brett Pentland <brett.pentland@eng.monash.edu.au>]

Hi Jim,

Thanks for doing this.  It looks like it will be a good addition to
the draft once the few issues that have been raised are addressed.

I have a couple of comments too:

> 5.2.5.2 DNA and the Address Autoconfiguration State Machine
> 
> When a link level event occurs indicating that the host has moved from one
> link to another, DNA requires the host to determine whether a change in IP
> link has occured by sending an RS. The DNA host SHOULD select one of its

We need to keep the terminology consistent (and this goes for the rest
of the draft too...)  The last discussions on this list that I can find
(around 26/5/05) talked about "point of attachment" for what you have
here called "link", and "link" for what you have called "IP link".  I
think the intention is to have them defined in the "L2 event
notifications for DNA" document.

> If the received RAs indicate that the host has moved to a new IP link (i.e.
> the IP link has changed), either because a DNA RA has been received or
> nonDNA RAs have been received and the host performs CPL, the host MUST
> transition all autoconfigured addresses in the "Confirmed" state to
> "Optimistic" and begin optimistic Duplicate Address Detection signaling for
> them. Optimistic Duplicate Address Detection signaling for "Optimistic"
> addresses MUST also be restarted and continued until either a duplicate is
> detected or the signaling timeout occurs, according to [RFCoDAD].

This sounds right for link-local addresses, but I think global addresses
will be invalid because of the link change and should be dropped
altogether.  New global addresses may be formed based on the prefix
information in the RA and those should go into the Optimistic state.

Brett.