high performance FR installation and unfinished requests

[Michael Schwartzkopff]

Am Dienstag, 17. Juni 2008 15:05 schrieb Alan DeKok:
> Michael Schwartzkopff wrote:
> > we have a FR server (version 1.1.7) on a Redhat machine. We use it for
> > dumping accouting requests into a database. We have about 200 requests
> > per second in average.
> >
> > Once in a while (1 per minute) we see a error in the log file:
> > Discarding duplicate request from client ... due to unfinished  request
> > ....
>
>   The client hasn't received a response to the request, and is
> re-sending it.  i.e. the request has taken LONGER than the client's
> timeout, usually 5 seconds or so.
>
>   That indicates a pretty significant backlog of requests at 200
> packets/s.  It likely means that your system us barely keeping up with
> the load.
>
> > Does the FR server drop accouting requests?
>
>   No.  But accounting requests should *not* be re-transmitted by the
> NAS.  If the NAS does this, it often means that they don't quite follow
> the RADIUS standards.
>
> > How can we monitor how any requests the RADIUS server gets?
> > Is this anything to worry?
>
>   You probably want to double-check your database.  Tune it, optimize
> it, upgrade the hardware, whatever.
>
>   Alan DeKok.

OK. We are testing with sql_log. The system load ist significant lower now. 
Uptime went from 0.3 to 0.05. But still we see the same amout of "error 
duplicate packets" in the radius log.

I would not be worried at all about that, the the CPU load of the NAS (radius 
client) is 100%. Perhaps the client drops the accout reply packets?

-- 
Dr. Michael Schwartzkopff
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