I found a solution with accounting enabled an a radius sql query.

2009/4/28 Lee Sharp <leesharp at hal dash pc dot org>

> Felix Schneider wrote:
>
>> Ok did setup a radius server.How do i have to configure the user to make
>> sure only the first user can log in.
>> where do i have to set this Simultaneouse-Use attribute?
>> I tried with == 1 --> no login possible
>> :=1 --> last one get the connection
>> But i need the connection for the username to exclusive for the first one
>> how logs in. the second one should get an access denied when he uses the
>> _same_ username.
>>
>
> This behavior is intentional and assumes people do not share passwords.  So
> whoever is logging in has rights, and whoever was "left on" was a mistake.
>  The only way to fix it is to dig into the code.
>
>
>                        Lee
>
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