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       rlm_counter - FreeRADIUS Module


       The  rlm_counter  module  provides  a general framework to allow access
       based on accumulated usage of a resource, such as total time online  in
       a given period, total data transferred in a given period, etc.  This is
       very useful in a ’Prepaid Service’ situation, where a user has paid for
       a  finite  amount  of  usage and should not be allowed to use more than
       that service.  Collection, monitoring,  and  replenishment  of  prepaid
       services are beyond the scope of this module.

       The main configuration items to be aware of are:

              The filename where the usage data is stored.

       key    An  attribute  which will be present in the Access-Request to be
              used as the ’index’ value for the counter. A  counter  entry  is
              tracked  for each unique key.  The most likely key you will want
              to use is User-Name.

              An attribute which will be used to increment the counter  value.
              If  this  attribute is Acct-Session-Time or an integer value the
              counter data is incremented by the  Attribute  value.   For  all
              other attribute types the counter is incremented by one.

       reset  How  frequently the counter data should be set back to 0.  Valid
              values for this variable are: hourly,  daily,  weekly,  monthly,
              ornever  Alternatively,  it  can  be  user defined, in the form:
              num[hdwm].  num is a numeric value, followed by one or  none  of
              the  following letters.  h: hours, d: days, w: weeks, m: months.

              This defines an attribute name which will be registered  by  the
              counter  module and can be used to set the maximum allowed value
              for the counter after which the user  is  rejected.   If  Daily-
              Session-Time  is  set,  you  can use the following syntax in the
              Users file to set a cap of 3600 seconds ( 8 hours ):

              DEFAULT Max-Daily-Session := 3600

              This is the  name  of  the  attribute  which  will  contain  the
              remaining  value  for  the  counter in the reply packet when the
              user is successfully authorized. The default attribute  name  is

              This  can  be  used  to  only  apply the limitations to specific
              service types of sessions.  For example, setting this to Framed-
              User  will  only  apply  the  counter module to Framed sessions,
              excluding other types such as Telnet or Rlogin.

              The maximum size of the cache to be used  by  the  module.   The
              default is 1000.


       This  module  registers  an  attribute,  so  it  should be added to the
       instantiate section, to be called on server startup.  When used in  the
       authorize section, it must come after any modules which set the ’check-
       name’ attribute.


       instantiate, authorize, accounting




       radiusd(8), radiusd.conf(5) rlm_sqlcounter(5)


       Chris Parker,

                                 13 March 2004                  rlm_counter(5)