The draft-04 states in page-8: --------------------------------------------------------------------------------------------------------------- 5.1. Establishment of Link Layer Connectivity The protocol aspects of this phase are out of scope, since it involves non-IETF protocols only. While some link-layer technologies may provide authentication and access control, this cannot be assumed to be available in the general case. --------------------------------------------------------------------------------------------------------------- If Link protocol is a non-IETF why it will be out of scope while used by the IP devices? in the end the IP is over link protocols and interacts with the below protocols. Why we need applicability-statements or problem-statements if we think the link layer is out of scope of IETF-RFCs? Regards AB