3.7.5.4 Receiving Message #6
On receipt of message #6, the host MUST check for the presence of flags within a notification payload of type EXCHANGE_INFO:
IKE_EXCHANGE_INFO_ND_BOUNDARY: If this flag is set, the host MUST set the Boundary flag for the QM SA. For more details see section 2.2.6.
Messages #7 and #8 are constructed and processed as specified in [RFC2408] section 3.1.