In your previous mail you wrote:

   The IPv4/IPv6 interworking problems seems to involve both Mobile IP and
   IPv4/IPv6 transition issues. We also have a draft which is relevant to
   this topic.

=> George's draft (draft-tsirtsis-v4-over-mipv6-00.txt) is very different,
he doesn't propose an integrated IPv4/IPv6 mobility but something very
simple (ie. trivial :-) based on two remarks:
 - new mobile phone infrastructures will be based on IPv6 (mainly because
   the lack of addresses in IPv4)
 - mobile phones will be dual stack hosts (because this is the safe way
   and this is not too expensive)
then a transition mechanism like DSTM which uses IPv4 over IPv6 tunnels
will be able to use freely/transparently all IPv6 devices like mobile IPv6
(I think George has EMA in mind but this applies too).

Regards

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