Provided by: freeradius-common_2.1.10+dfsg-3build2_all bug


       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)