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:

   From: "Francis Dupont" >
   
   => 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?)
   
   
   Are you recommending that all mobile phone operators should create IP VPN's
   for all phones on their network and to maintain them for visitors and
   roamers on other networks?
   
=> you already have a "VPN" between the MN and the HA in MIPv6, so
I feel free to recommend this (:-).

   This sounds like a lot of IP VPNs to create and maintain across multiple
   networks for people who roam, and unnecessary for those that don't.

=> I don't understand the "multiple networks" argument. The "VPN" is just
an IPsec SA pair (MIPv6 uses two pairs) between a mobile and a fix point
(the mobile-ip Home Agent).

   We are not talking dial-up users or even data users, jut straight
   3G, GPRS, or WAP users.
   
=> we are talking about IP users.

Regards

Francis.Dupont@enst-bretagne.fr