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Resolved Issue 227: Indicating crypto properties of a packet
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Version| Type | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Version: A 4 bit field which contains the version of CAPWAP used in
this packet. The value for this draft is zero (0).

Payload Type: A 4 bit field which specifies the payload type that
follows the preamble header. The following values are supported:

0 - Clear text. If the packet is received on the data UDP port,
the CAPWAP stack MUST treat this as a clear text CAPWAP data
packet. If received on the control UDP port, the CAPWAP stack
MUST treat this as a clear text CAPWAP control packet. If the
control packet is not a Discovery Request or Response packet,
it is illegal and MUST be dropped.

1 - DTLS Payload. The packet is either a DTLS packet and MAY be
a data or control packet, based on the UDP port it was received
on (see section Section 3.1).
PPT Version