The problem is that if a clients tries stateful DHCPv6 by sending an IA option with the request while the server doesn't accept stateful DHCPv6 (NoAddrsAvail), the exchange will fail and not even information options will be sent -- see parallel thread. In that case, the client MUST fall back to stateless exchanges if it wants to request information options.I wouldn't rule this out completely. I think normally RFC 3736 will be the reasonable thing to do. But if client for some reason wants some stateful info it could still try to use RFC 3315 I think.
Christian
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