Freeradius as a loadbalancer - logging dropped accounting requests

Alan DeKok aland at deployingradius.com
Thu Jun 29 13:27:41 CEST 2017


On Jun 28, 2017, at 3:05 AM, AleŇ° Rygl <ales at rygl.net> wrote:
> It is also strange that the drops (represented by retransmissions) are nearly 
> independent on the average packet rate.

  Because it's an average packet rate.  Low packet rates aren't an issue.

> I have the same amount of 
> retransmissions at 2 a.m. (1k req/s) and at 4 p.m. (~4k req/s). Which is less 
> than FR could just as a balancer IMHO do.
> 
> The they appear mainly at the top of the hour where we have spikes of 
> concurrent accounting req. It looks like FR can handle quite high rate of 
> steady load but the bottleneck could be in the amount of concurrent requests 
> in spikes. 

  Yes.  When the traffic spikes to more than FR can handle, bad things happen.

  And as I said, FR can do 20K packets/s without an issue.  The limiting factor is almost always the database.

  Alan DeKok.




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