I agree with you that upper layer should validate the address of the
communication end point.
> - for forwarding case, I'm not sure. what is the scope for ::?
> if it is linklocal or interface local (node local), maybe
> "beyond scope" icmp6 error.
This is my concern. The unspecified doesn't specify any of the addresses,
thus it never belongs any of the scope. If an administrator consider it
should be prohibited, use "administratively prohibited" icmp6 error.
Atsushi Onoe
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