> have you read the latest MIPv6 spec? 

I have, in fact read the spec.

> there is an explicit code in the Binding Ack which says "Route
> Optimization unnecessary due to low traffic". the CN just has to
> refuse the binding with this code.

So, existing nodes will reportedly refuse the binding with an "icmp
parameter problem" message.  Why do we need a second encoding for the
same message?  Isn't it better to just have one encoding?

                                                - Bill
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