RADIUS attribute from rfc2865

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Login-LAT-Service

This Attribute indicates the system with which the user is to be
      connected by LAT.  It MAY be used in Access-Accept packets, but
      only when LAT is specified as the Login-Service.  It MAY be used
      in an Access-Request packet as a hint to the server, but the
      server is not required to honor the hint.

      Administrators use the service attribute when dealing with
      clustered systems, such as a VAX or Alpha cluster. In such an
      environment several different time sharing hosts share the same
      resources (disks, printers, etc.), and administrators often
      configure each to offer access (service) to each of the shared
      resources. In this case, each host in the cluster advertises its
      services through LAT broadcasts.

      Sophisticated users often know which service providers (machines)
      are faster and tend to use a node name when initiating a LAT
      connection.  Alternately, some administrators want particular
      users to use certain machines as a primitive form of load
      balancing (although LAT knows how to do load balancing itself).

   A summary of the Login-LAT-Service 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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
   |     Type      |    Length     |  String ...
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-Type

      34 for Login-LAT-Service.

   Length

      >= 3

   String

      The String field is one or more octets, and contains the identity
      of the LAT service to use.  The LAT Architecture allows this
      string to contain $ (dollar), - (hyphen), . (period), _
      (underscore), numerics, upper and lower case alphabetics, and the
      ISO Latin-1 character set extension .  All LAT string
      comparisons are case insensitive.

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