Please check you run latest stable version of RouterOS before starting.

We have video which covers every single step of configuration using WinBox, you can watch it now. After making all changes as in video I can recommend setting src address for Netflow target to router IP to avoid issues with Netflow delivery to Linux machine.

And from FastNetMon Advanced side you need to change:

sudo fcli set main average_calculation_time 60
sudo fcli commit

If you prefer to use command line you can continue and use instructions below.

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=00:00:30
set inactive-flow-timeout=00:00:30

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 by FastNetMon’s address):

add dst-address= port=2055 version=9 v9-template-refresh=30 v9-template-timeout=30

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