User disconnects but stays online in radius

Russell Mike radius.sir at
Mon Feb 18 20:40:29 CET 2013

On Monday, February 18, 2013, Phil Mayers wrote:

> On 18/02/13 18:02, Mobin Yazarlou wrote:
>> Hi,
>>   I am using freeradius v2.1.12 with MySQL support and noticed if a user
>> disconnect when radius server is down, NAS can not inform radius about
>> user being disconnected and radius assume user is still online after
>> coming up again. This restricts user from connecting again when you set
>> simultaneous-use to 1.
>>   Is there any solution for this? My NAS is pptpd on Debian 6.
> RADIUS uses UDP, and NASes don't "save" accounting packets which don't get
> a reply; they usually send 1-5 attempts over a few seconds, then give up
> (or move to the 2nd RADIUS server).
> You need to take this into account.
> Possible solutions include some combination of:
>  1. Use interim accounting. Then, use a script to expire any sessions
> which have not seen accounting packets in X*interim-interval; X==3 for
> example
>  2. Setup a 2nd RADIUS accounting server and ensure your NAS has both
> servers configured. Use one of several configs to write the accounting data
> to a robust, replicated database. One way to do this is with the "robust"
> accounting that comes with FreeRADIUS.
>  3. Use a script to check your NASes active sessions and compare to
> accounting data at a certain interval.
> ...and so on.
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Very good & elaborated response, it also helped me. Quality of Information
was superB. Thanks Man
RM --
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