>    If an application or upper-layer specifies a source address that is
>    not in the candidate set for the destination, then the 
> network layer
>    MUST treat this as an error. The specified source address may
>    influence the candidate set, by affecting the choice of outgoing
>    interface.
> 
> Could someone clarify the intention of this paragraph?

The intent is that if the application or upper-layer specifies a source
address that is clearlyy illegal, then the network layer reports an
error instead of sending a packet with an illegal source address. Here
are a couple examples:
a) The application specifies a source address of ff02::1.
b) The application is sending to fe80::1%2, and specifies a source
address of fe80::5. But fe80::5 is not assigned to an interface on link
2.

Rich

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