[EMU copied for EAP input]

Here in ABFAB, we're designing a new EAP lower layer for applications to
use for authentication. We're using the GSS-API (RFC 2743) as our
application integration point.

Currently, our lower layer is kind of chatty. The peer sends a first
message that roughly says "Hi, I'd like to authenticate." Then the
authenticator sends an identity request EAP message. Then the peer sends
an identity response. Then the authenticator (probably after an AAA
interaction) respons with the first EAP method message.

As best we can tell that round trip is unneeded. We could instead
include an unsolicited identity response in our first message from the
peer to authenticator and get a request with an EAP method message from
the first message from the authenticator.

We can't see any down side of this. There seems to be nothing in the
identity request.  We already have another approach for "network
selection." If you want to know who your authenticator is in order to
decide on an identity, we have a lower-layer specific mechanism for
that.

I'd appreciate any comments. From ABFAB participants, do we want to make
this optimization? From EMU participants are we missing anything?
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