RADIUS attribute from rfc2869

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Configuration-Token

This attribute is for use in large distributed authentication
      networks based on proxy.  It is sent from a RADIUS Proxy Server to
      a RADIUS Proxy Client in an Access-Accept to indicate a type of
      user profile to be used.  It should not be sent to a NAS.

   A summary of the Configuration-Token attribute format is shown below.
   The fields are transmitted from left to right.

    0                   1                   2
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     Type      |    Length     |  String ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type

      78 for Configuration-Token.

   Length

      >= 3

   String

      The String field is one or more octets.  The actual format of the
      information is site or application specific, and a robust
      implementation SHOULD support the field as undistinguished octets.

      The codification of the range of allowed usage of this field is
      outside the scope of this specification.

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