Get number of users logged in via mySQL

Alan DeKok aland at
Mon Dec 17 20:47:53 CET 2018

On Dec 17, 2018, at 11:54 AM, Renato Sousa <rensousa at> wrote:
>>> Yes ... If the information provided by NAS were correct a sentence as
>>> below would solve the question:
>> select count (*) from radaact where acctstoptime is null;

  If the NAS is lying to FreeRADIUS, then there is little you can do.

>>> However, when I go to analyze the selected records, I see repeated
>>> records with the same device mac-address.
>> Right now I saw that my user does not have an open session on radius. :(

  I don't know what that means.  More correctly, I don't know what *you* think that means.

  The radacct table just stores the data sent by the NAS.  If there are multiple session in the DB for a user, then:

a) the user has multiple sessions


b) the NAS isn't sending FreeRADIUS "stop" packets when a session closes.

  There really aren't any other options.

> Most of my APs are Ubiquiti, but I also have Cisco, HP, and Aruba on my
> infraestructure. Is there any incompatibility with these manufacturers when
> users move from one to another?

  No.  They just send RADIUS packets.

> Anyone have any tips to improve this diagnosis?

  Look on the NAS to see which users are online.  Most NASes should provide an admin interface to do this.

>>> How to delete these open sessions?
>>  SQL statements.
> I have already done an UPDATE in the tables to insert date in the old
> records with acctstoptime equal to NULL, however they continue to be
> generated.

  Then the user has multiple sessions.  You will need to configure Simultaneous-Use to ensure that each user has only one session active at a time.

  Alan DeKok.

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