Re: Solicited Nodes' for DAD (was Re: [DNA-BOF] DAD OptimizationProblem Statement)

[Youn-Hee Han <yhhan@sait.samsung.co.kr>]

Hi Greg,

> >   [Possible subjects 2]   
> > 
> >    In order to process DAD, all nodes have to send solicited-node 
> >    multicast address using NS message, whenever IPv6 addresses are 
> >    composed of its interface identifier.  This procedure may reduce 
> >    the network performance especially within the low bandwidth 
> >    networks.
> 
> I think that solicited nodes' addresses are _not_ inefficient
> for DAD.  In realistic scenarios, solicited nodes' group
> membership is likely only to be those hosts which
> have those addresses configured (a very small group).

Definitely, you are right.

> Also, having a multicast group means that only those
> people who are members of the group will process the
> packet.

Yes.

> There is no other way to ensure that only those
> interested are required to process the packet, except
> through unicast either to a host (only works if the host is not
> tentative), or a DAD server (with stateful DAD).

Yes. It is important to remind that unicast is available 
if the host's address is not tentative. 

> 
> The real issue is using multicast on networks which do
> not distinguish between multicast and broadcast.
> 
> If the packet is only forwarded to group members, this
> is not a problem, so this issue is link-layer dependent.
> 

Thanks for your comments.

Youn-Hee Han.