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       rlm_acct_unique - FreeRADIUS Module


       The rlm_acct_unique module creates a unique accounting session Id.

       Many  NAS  vendors  have  their  equipment  supply  an  Acct-Session-Id
       attribute which is not unique  over  reboots.   This  makes  accounting
       difficult,  as  there  will  be many independent sessions with the same
       Acct-Session-Id  attribute.   This  module  uses  the   Acct-Session-Id
       attribute, along with other attributes in the request, to create a more
       unique session ID, called Acct-Unique-Session-Id.

       The main configuration items to be aware of are:

       key    A list of the attributes used in calculating an MD5  hash  which
              is used as the value for the unique session id.


              modules {
                acct_unique {
                   key = "User-Name, Acct-Session-Id, NAS-IP-Address, NAS-Port"
              preacct {

       After  generating  the  MD5  hash, the module adds it to the accounting
       request packet received from the client.  It will look  something  like
       this in your detail file:

                   Acct-Unique-Session-Id = "c66ef57e480b9d26"

       NOTE:   Any attribute you specify that is not found in the ’dictionary’
       file will cause the server to fail and exit with an error.

       NOTE:  If you want the Acct-Unique-Session-Id of the Start and the Stop
       packet  of  a  particular session to match, you must use values for the
       key that will stay the same for the Start and Stop.  The above  example
       is  a good start.  Adding ’Acct-Session-Time’, for example, would cause
       a mismatch because that value is not the same on  the  Start  and  Stop
       accounting packets.


       authorization, pre-accounting, accounting




       radiusd(8), radiusd.conf(5)


       Chris Parker,

                                3 February 2004             rlm_acct_unique(5)