Pekka Savola:

> I agree that there is a difference.
> 
> But I'm not sure the difference is that great. I mean, you can still
> send a multicast response. And in this case the solicited/non-solicited
> difference is just whether you have one or two additional ND options
> in there. And other hosts that receive this can still process them
> securely or do their own solicitation if timestamp was insufficient.

Yep, I agree that this difference is not significant.  It's just 
something an implementation might do, so it may be worth spelling 
out..

> The only thing that is needed implementation-wise is for the multicast
> RA code piece to know whether it needs to include a Nonce. But I would
> expect most implementations to have some idea on why they are sending
> the RA. If not, a new parameter has to be added to the function call.
> 
> In any case, I added this text to Section 5.3.3:
> 
> 	  Note that routers may decide to send a multicast
> 	  advertisement to all nodes instead of a response to a
> 	  specific host. In such case the router MAY still include the
> 	  nonce value for the host that triggered the multicast
> 	  advertisement.

This seems basically good -- with the caveat that if the router does 
not include the nonce, the advertisement may end up being ignored by 
SEND nodes, right?

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Jari Arkko: Right. Add "Omitting the nonce value may, however, cause
the host to ignore the router's advertisement, unless the clocks in
these nodes are sufficiently synchronized so that timestamps can be
relied on."

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James Kempf: Two issues coming out of WG Last Call need to be resolved
prior to sending draft-ietf-send-ndopt-04.txt to the IESG.

Issue 67: Possible implementation variability when nonce omitted from RA.

Suggested resolution: Add following text to paragraph 2, Section 5.3.3, to
guide implementation:

"Omitting the nonce value may, however, cause
the host to ignore the router's advertisement, unless the clocks in
these nodes are sufficiently synchronized so that timestamps can be
relied on."

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Pekka Nikander: Ok to me. 

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