> Clearly I need a
> picture to understand why the MN would know its HA, but not its home prefix.

While the MN must know at least one home prefix it might not know all of them
in  particular it might not know about any new prefixes that have been
introduced  while the MN was away from home.
So it needs to be able to get the complete list including the current
lifetimes for the prefixes.

Of course, if all the home prefixes that the MN knows expire due to
renumbering then the MN is in deep trouble.

  Erik

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