aland at deployingradius.com
Thu Oct 16 18:06:53 CEST 2008
Dmitry V. Krivenok wrote:
> I just want to know what is the simplest way to
> disallow 2 simultaneous sessions.
> Are there any standard solutions?
Of course. See doc/Simultaneous-Use.
> I found (in source of rlm_sql), that checking is based on
> analysis of accounting information.
> What if 2 Access-Requests arrive "simultaneously"?
> There is no accounting information available yet (it will
> become available just after receiving Accounting-Start).
> Hence it's not reliable to rely on accounting information only.
> Am I right?
> It seems to me that AAA and NAS may be not synchronized.
> So, we need to contact NAS somehow to determine active
> sessions and match them with accounting info.
> Looks like very complex task :(
That's what the "checkrad" program is for.
None of these issues are new. People thought of them, and came up
with solutions, 10 years ago. These solutions are even documented in
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