RADIUS attribute from rfc8045

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IP-Port-Int-Port

The format of IP-Port-Int-Port TLV is shown in Figure 9.  This
   attribute carries IPFIX Information Element 7, "sourceTransportPort",
   which is the source transport number associated with an internal IPv4
   or IPv6 address (refer to ).

    0                   1                   2                   3
    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    TLV-Type   |     Length    |      sourceTransportPort
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           sourceTransportPort     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 9

   TLV-Type

      6

   Length

      Six octets

   sourceTransportPort

      Integer.  This field contains the data (unsigned16) of
      sourceTransportPort (7) defined in IPFIX, right justified, and
      unused bits MUST be set to zero.

   IP-Port-Int-Port TLV MUST be included as part of the
   IP-Port-Forwarding-Map Attribute (refer to),
   identified as 241.7.6.

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