Re: [DNA-BOF] BoF Last Call on DNA WG Charter.

[Bernard Aboba <aboba@internaut.com>]

> If "the same link as before" includes a link that your host was attached a
> while ago, the above statement is not always true. As Bernard and John
> pointed out, DHCP case is safe as the network guarantees the configuration
> during your lease. But in the case of IPv6 address autoconfiguration, nobody
> is there to defend your address on your behalf while you are gone.

The same problem occurs with IPv4 Link-Local addresses.  Since the
probability of conflict is relatively high, we had to recommend that a
host awakening from sleep, attaching, etc. had to do DADv4 again.

The chance of conflict is much lower in the case of IPv6, so I'd ask
whether we think that the same approach is still necessary.  It's quite
costly, of course, so if it can be avoided that is a good thing.