RADIUS attribute from rfc8045

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IP-Port-Int-IPv4-Addr

The format of IP-Port-Int-IPv4 TLV is shown in Figure 7.  This
   attribute carries IPFIX Information Element 8, "sourceIPv4Address",
   which is the IPv4 source address before NAT operation (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    |       sourceIPv4Address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         sourceIPv4Address         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                 Figure 7

   TLV-Type

      4

   Length

      Six octets

   sourceIPv4Address

      Integer.  This field contains the data (ipv4Address) of
      sourceIPv4Address (8) defined in IPFIX.

   If the internal realm is with an IPv4 address family, the
   IP-Port-Int-IPv4-Addr TLV MUST be included as part of the
   IP-Port-Forwarding-Map Attribute (refer to),
   identified as 241.7.4.

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