Re: [DNA] Model: how to treat "link down" events

[Greg Daley <gregd@research.panasonic.com>]

Hi Erik,

Erik Nordmark wrote:
[cut]
> 
> I suspect it's not that hard to have a split implementation do the right
> thing. The 'link up' event can be used by the kernel to immediately set
> the optimistic DAD state, and then pass the event to the daemon that
> does DNA/RS/RA. That daemon will later tell the kernel when to turn off
> the optimistic state.
> 
> But it sure is worth-while to list this as an implementation
> consideration, in addition to making a clear statement about the
> ordering/atomic behavior of the host as a whole for this issue.
> 
> Do we put that in CPL or in draft-pentland? They both need the
> same thing.

I think that the draft-ietf-dna-hosts already mentions some
considerations about DAD optimistic behaviour.   Perhaps
it should go there.

Thomas' question about whether CPL and Hosts are really
separate still remains, although I think at an earlier
time, the WG consensus was to keep the drafts separate.

If they're separate, we may wish to send them paired
to the IESG like SEND and CGA (RFC3971 and RFC3972).
This could make some sense, as CGA is mechanism and
SEND a system, like CPL is a mechanism, and DNA is
a system.

Opinions are welcome on this issue.

Greg