RADIUS attribute from rfc2865

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Framed-AppleTalk-Network

This Attribute indicates the AppleTalk Network number which the
      NAS should probe to allocate an AppleTalk node for the user.  It
      is only used in Access-Accept packets.  It is never used when the
      user is another router.  Multiple instances of this Attribute
      indicate that the NAS may probe using any of the network numbers
      specified.

   A summary of the Framed-AppleTalk-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

      38 for Framed-AppleTalk-Network.

   Length

      6

   Value

      The Value field is four octets.  Despite the size of the field,
      values range from 0 to 65535.  The special value 0 indicates that
      the NAS should assign a network for the user, using its default
      cable range.  A value between 1 and 65535 (inclusive) indicates
      the AppleTalk Network the NAS should probe to find an address for
      the user.

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