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Configuring NetFlow on a Vyatta is fairly simple:
1. For a start we set the NetFlow version.
set system flow-accounting netflow version 9
2. To export flows to the collector where the NetFlow reporting tool is installed, we will need to set the flow destination. A flow destination is the IP address of the NetFlow collector and the listening port.
set system flow-accounting netflow server <NFA server IP> port <Port #>
Ex: set system flow-accounting netflow server 192.168.0.1 port 9996
3. Then we issue the following command for every interface you want to monitor
set system flow-accounting interface <interface name>
Ex: set system flow-accounting interface eth0
4. Since our NetFlow and sFlow Analyzer expects flows every minutes let’s make sure the active flow timeout is set to 1 minutes. By default this is already set to 1 minute or 60 seconds.
set system flow-accounting netflow timeout expiry-interval 60
5. Vyatta flow accounting can be resource intensive when statistics are being collected on all received packets. The alternative is to turn on sampling where 1 packet is accounted for every N packets, N being the sampling rate.
set system flow-accounting netflow sampling-rate N
Ex: set system flow-accounting netflow sampling-rate 500
6. Finally, the following commands will set other essential Vyatta flow accounting parameters.
set system flow-accounting netflow engine-id id (id values range between 0 – 255)
set system flow-accounting netflow timeout max-active-life 604800
set system flow-accounting netflow timeout flow-generic 3600
set system flow-accounting netflow timeout tcp-fin 300
set system flow-accounting netflow timeout tcp-generic 3600
set system flow-accounting netflow timeout tcp-rst 120
set system flow-accounting netflow timeout icmp 300
set system flow-accounting netflow timeout udp 300
Please refer the below link for more details: