Re: Re: Reclassification of DNA Protocol and new Simple DNA protocol

>"If the addresses obtained from a previous router
are no longer valid, the 
>host SHOULD NOT send a Neighbour Solicitation to that
router."
>
>Does this convey what you want or Would you like some
stronger text?

The SHOULD does not explain what implementations need to do.
 The host can't 
just use the address (since it's no longer valid) even if
the router is 
confirmed.  So either there is no point in sending the NS,
or some special 
procedure needs to be invoked (e.g. waiting for RA
confirmation, or 
immediately invoking DHCPv6 if that is how the address was
obtained).