Now that the handshake phase is no longer being used for discovery,
could we collapse the information in 3-way Handshake phase into the
Authentication and Authorization phase? It seems that this is a MAY
according to this text, so it should at least be possible:
The initial EAP Request message MAY be optionally carried by the
PANA-Start-Request (as opposed to by a later PANA-Auth-Request)
message in order to reduce the number of round-trips. This
optimization SHOULD NOT be used if the PAA is desired to be stateless
in the handshake phase since transmission of an EAP Request message
creates a state at EAP layer. See [RFC4137] for more information on
the EAP state machine and the allocation of state information in the
respective protocol steps.
I'm not sure the state at the EAP layer is significant enough to burden
PANA with an entire phase and 3-way handshake.
Given that discovery is now out of scope in this document and the IP
address of the PAA is obtained from DHCP, I think that it would be
better to go ahead and send EAP payloads right away. Removal of the
entire Handshake phase would be a significant simplification to the
protocol.
- Mark
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