If you navigate to
network setup -> traffic shaping -> ToS traffic priority
are you able to set DNS as high priority & downloads low priority ( if it is on a specific port or source IP )
This may make a difference.
firewall -> conntection tracking -> Enable Flood Rate Limiting
can make a difference as well.
Regarding the 560D, the best option would be to go via technical support and send them a Technical Support Report.
The case will need to be escalated to 2nd level....mention this to the support person you corrospond with.
Thanks for your answer.
TOS for DNS was enabled and Enable Flood Rate Limiting was disabled,
when we got this problems. Cause the appliance is responding very slow, not only network traffic
behind the wan, I think in case of a lot of bandwith usage there is some process which slows down
the unit so the nameserver at the appliance is getting very slow or not responding. I'd like to disable the
statsd - but don't know hot to do this.
statsd should not load up a 565 too much.
If you look in the TSR at this entry
you will see how many current connections are through the device....it will handle a few thousand adequetly.
If it is a busy unit, certainly disable flood detection for diagnostics to see if you need to increase the threshold. Also flood events are logged as well so you can see if it is getting triggered.
If the slow performance only occurs when administrating the device, see if using http rather than https makes a difference.
Any further diagnostics really required a Support Report, which I recommend you only submit to support.