Freeradius as a loadbalancer - logging dropped accounting requests

Aleš Rygl ales at
Mon Jun 26 14:38:36 CEST 2017

yes, nevertheless "dup" are just 21 packets over several days (and this is the 
same for remaining home servers) while the LB instance dropped 2k of requests 
within 2 hours... According to some other stats it dropping happens mainly 
every hour in peaks. I was monitoring the number of threads and it is constant 
all the time and there is really big headroom provide by config.


On pondělí 26. června 2017 8:25:33 CEST Alan DeKok wrote:
> On Jun 26, 2017, at 8:01 AM, Aleš Rygl <ales at> wrote:
> > # echo "stats client acct" | radmin -d /etc/freeradius_04/
> > radmin> stats client acct
> > requests        159032334
> > responses       159030646
> > dup             21
> > ...
> > dropped         21
> > 
> > Is there a way how to indetify the reason why are some req. dropped? I.e.
> > logging such requestest? LB  there is no lack of CPU or memory on the
> > server, no drops in the UDP stack..
>   See the "dup" field.
>   The NAS is sending duplicate Accounting-Request packets while the server
> is still processing the old one.  So, the new one is dropped.
>   This is usually because the RADIUS server is slow to respond to a
> particular request.  i.e. transient load spikes, etc.

Yes, this makes sense, nevertheless the balancer instance has 

>   Alan DeKok.

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