Re: issue 4: how to signal support for MOBIKE

 In your previous mail you wrote:

   i went thought about the two most important options: notify and vendor id
   they both seem to provide the same capability. notify is used for errors but
   also for indicating sender capabilities. the same is true for the vendor id.
   
=> it seems the IPsec WG was not in favor of vendor ids so I vote for
notify.

   
   Note that the node could also attempt MOBIKE optimistically with the
   critical bit set to one when a movement has occurred. The drawback of this
   approach is, however, that the an unnecessary MOBIKE message round is
   introduced on the first movement.
   
=> IMHO the critical bit will simply kill the session when it is not
supported (i.e., there is no recovery). This is why the idea to negociate
MOBIKE support ASAP is the right one.
BTW the discussion was between a new payload or a new exchange for
SA updates (I believe the best is a new payload but I have no strong
argument).

Regards

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