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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