So I'm using the above on multiple Pi's, and it seems pretty good.However, on one or two, the channels go high sometimes (MoS, jitter etc). I think I know what the problem is (too many packets hitting the device the Pi is behind is being seen as some sort of DDOS issue) .I say this as lowering the packet rate from the default of 1000 to 100 cures the issue, so its not a PRTG problem as such. But I would like to know where the defaults come from-1000 packets every 20ms at 172 bytes each seems a bit excessive? And this repeated every 60 seconds-have I got this right? If this is to test the likes of a VoiP circuit, is that the sort of packet rate (the byte size sounds about right) you would have?