As first step, please install at least RouterOS 6.38 because it has very urgent fix for Netflow implementation on Mikrotik:
*) traffic-flow - fixed flow sequence counter and length;
We suggest using ssh for configuration process but you also could use WinBox or Webfig for this task (select “IP”, “Traffic flow” on left menu).
As first step, please open Netflow configuration:
/ip traffic-flow
And enable Netflow for all ports with affordable timeouts:
set enabled=yes set interfaces=all set cache-entries=128k set active-flow-timeout=00:01:00 set inactive-flow-timeout=00:01:00
128k value works for almost all carried-grade devices. But if it does not work for you, try 64k, 32k, 16k.
Change to Netflow target configuration:
/ip traffic-flow target
And specify FastNetMon here (replace 192.168.88.13 by FastNetMon’s address):
add dst-address=192.168.88.13 port=2055 version=9 v9-template-refresh=30 v9-template-timeout=30
And from FastNetMon Advanced side you need to change:
sudo fcli set main average_calculation_time 60 sudo fcli set main average_calculation_time_for_subnets 60 sudo fcli commit
Also, in v6.44 testing release Mikrotik added option to set lower than 60 seconds timeout and you can try 30 seconds for active and inactive timeouts for testing.