RE: [DNA] Some questions about Simple DNA

[Bernard Aboba <Bernard_Aboba@hotmail.com>]

>In order to do this we need to keep track of how long the host has been 
>gone from the link. And since the DAD transmits and timeouts are based 
>on host specific configuration, it might be very hard to come up with a 
>decent borderline number on the amount of time elapsed away from the 
>link when the host needs to start doing DAD.

This could be accomplished by tracking the time that has elapsed since 
receipt of a "link down" indication.  This could be included with the
configuration data associated with a given router. 

That way, when the reachability test completes, the host would check
the elapsed time since "link down" against a host-configured parameter 
in order to decide whether to do Optimistic DAD.