Re: [mobile-ip] Re: FW: I-D ACTION:draft-tsirtsis-dsmip-problem-0 0.txt

[Francis Dupont <Francis.Dupont@enst-bretagne.fr>]

 In your previous mail you wrote:

   ... A dual stack
   mobile in a v4 only foreign network would then be able to create a v4&v6
   over v4 (forward and reverse) tunnel with its HA and thus maintain all its
   connectivity.
   
=> as a cross-version tunnel will never be "optimized" (i.e., MN-CN direct
communication is not possible), IMHO mobile-ip solutions are clearly
overkilling in this kind of environments: a smart "road warrior" IPsec
VPN will be enough. Today two parts are missing:
 - cross-version IPsec tunnels are not commonly available (note for
   IPsec implementors: they are specified in RFC 2401, why do you not
   support them?)
 - a peer address (aka care-of address here) update mechanism is needed
   to make hand-off support more efficient.
I don't consider the side-effect to get communications protected on
the wireless section as bad (:-).

Thanks

Francis.Dupont@enst-bretagne.fr