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P-flag in PANA Header
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|R S N P r r r r r r r r r r r r|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
P(re-authentication)

When pre-authentication is performed, the P-flag of PANA messages
are set in order to indicate whether this PANA run is for
establishing a pre-authentication SA. The exact usage of this
flag is described in Section 3. This flag is to be assigned by
IANA.
PPT Version