Hi Charlie,
In Rev 5 of the I-D posted at the URL in your earlier email, Sec 10.3.2
states:
"
When the Status
field in the Binding Acknowledgement is greater than or equal to 128
and the Source Address of the Binding Update is on the home link, the
home agent MUST send it to the mobile node's link layer address
(retrieved either from the Binding Update or through Neighbor
Solicitation).
"
The MN may be on a virtual HL and hence there may not be a LLA for the MN to
which the BAck can be sent. IMO the above sentence should be revised by
deleting the part about sending it to the LLA and the clarification in the
parentheses.
-Basavaraj