At 11:52 AM -0400 5/22/09, David Wierbowski wrote:
>Why?

Because there is nothing in the document to indicate that it is invalid. 
HTTP_CERT_LOOKUP_SUPPORTED is only mentioned twice in RFC 4306:

   Certificate payloads SHOULD be included in an exchange if
   certificates are available to the sender unless the peer has
   indicated an ability to retrieve this information from elsewhere
   using an HTTP_CERT_LOOKUP_SUPPORTED Notify payload.

. . .

        HTTP_CERT_LOOKUP_SUPPORTED               16392

            This notification MAY be included in any message that can
            include a CERTREQ payload and indicates that the sender is
            capable of looking up certificates based on an HTTP-based
            URL (and hence presumably would prefer to receive
            certificate specifications in that format).

Neither of those make it sound like it is required before sending type 12 or 13 
certificates.

--Paul Hoffman, Director
--VPN Consortium
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