NetFlow is a network protocol developed by Cisco that provides network monitoring and accounting capabilities. MikroTik routers support NetFlow versions 1, 5, 9, and IPFIX. Here's a step-by-step guide to configuring NetFlow in MikroTik:

Enable Traffic Flow on the MikroTik router:

/ip traffic-flow set enabled=yes

Specify the interfaces to gather statistics for Traffic Flow. By default, all interfaces are used:

/ip traffic-flow set interfaces=all
You can specify specific interfaces by separating them with commas:
Code
/ip traffic-flow set interfaces=ether1,ether2

Configure the cache entries and timeouts according to your needs:

/ip traffic-flow set cache-entries=4k active-flow-timeout=30m inactive-flow-timeout=15s

Enable packet sampling if required:

/ip traffic-flow set packet-sampling=yes sampling-interval=2222 sampling-space=1111

Specify the IP address and port of the host that will receive NetFlow packets:

/ip traffic-flow target add dst-address=192.168.0.2 port=2055 version=9
You can specify the NetFlow version (1, 5, 9, or IPFIX) and other parameters as needed.

Verify the Traffic Flow and target configurations:

/ip traffic-flow print
/ip traffic-flow target print
The router will now start sending NetFlow packets to the specified target.

Example Configuration

Here's an example configuration:

/ip traffic-flow set enabled=yes interfaces=all cache-entries=4k active-flow-timeout=30m inactive-flow-timeout=15s
/ip traffic-flow target add dst-address=192.168.0.2 port=2055 version=9

This configuration enables Traffic Flow on all interfaces, sets the cache entries to 4k, and specifies a target host with IP address 192.168.0.2 and port 2055 using NetFlow version 9.

Mikrotik NetFlow Configuration Reference Doc: This Link points to source file.