RADIUS attribute from rfc8045

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IP-Port-Alloc

The format of IP-Port-Alloc TLV is shown in Figure 11.  This
   attribute carries IPFIX Information Element 230, "natEvent", which is
   a flag to indicate an action of NAT operation (refer to ).

   When the value of natEvent is "1" (Create event), it means to
   allocate a range of transport ports; when the value is "2", it means
   to deallocate a range of transports ports.  For the purpose of this
   TLV, no other value is used.

    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    |            natEvent
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
               natEvent            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 11

   TLV-Type

      8

   Length

      Six octets

   natEvent

      Integer.  This field contains the data (unsigned8) of natEvent
      (230) defined in IPFIX, right justified, and unused bits MUST be
      set to zero.  It indicates the allocation or deallocation of a
      range of IP ports as follows:

         0: Reserved
         1: Allocation
         2: Deallocation

   IP-Port-Alloc TLV MUST be included as part of the IP-Port-Range
   Attribute (refer to), identified as 241.6.8.

        FreeRADIUS Vendor-Specific dictionary values:

                    0 - Reserved 
                    1 - Allocation 
                    2 - Deallocation 
            

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