RADIUS attribute from rfc2865

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Framed-IPX-Network

This Attribute indicates the IPX Network number to be configured
      for the user.  It is used in Access-Accept packets.

   A summary of the Framed-IPX-Network Attribute format is shown below.
   The fields are transmitted from left to right.

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |             Value
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
              Value (cont)         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+Type

      23 for Framed-IPX-Network.

   Length

      6

   Value

      The Value field is four octets.  The value 0xFFFFFFFE indicates
      that the NAS should select an IPX network for the user (e.g.
      assigned from a pool of one or more IPX networks kept by the NAS).
      Other values should be used as the IPX network for the link to the
      user.

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