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Re: 2nd try

 In your previous mail you wrote:

   (We probably need to clarify the notion that ESP is 
   not an "extension header" re IPv6, despite the fact that the IPv6 
   spec calls it that.  The same is true for AH.)

=> in a private discussion a fine proposal was defined: talk about
extension headers using the generic extension header format.
(ESP, AH and IPCOMP don't use the generic format, AH because the
length field is in another unit).

   In that case, OPAQUE 
   will be applicable only to non-initial fragments.
   
=> in theory the upper layer header can be in a non-initial fragment
when a (large) destination option header is used, so in IPv6 OPAQUE
can be applicable to all fragments.

Regards

Francis.Dupont@enst-bretagne.fr

PS: BTW there is no OPAQUE encoding in the current IKEv2 draft...