Pekka Savola:

   1.  Entries made as a side effect of a Neighbor Solicitation or
       Router Solicitation.  A router receiving a Router Solicitation
       with a firm IPv6 source address and a Target Link-Layer Address
       extension inserts an entry for the IPv6 address into its Neighbor
       Cache.  Also, a node performing Duplicate Address Detection (DAD)

==> what is a "_firm_ IPv6 source address" ?  

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Jari Arkko: I believe this talks about other addresses than
the unspecified address. Clarified text: "... with the IPv6 source
address not equal to the unspecified address and ...

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