Start mininet :

sudo mn --controller=remote,ip=127.0.0.1 --topo=linear,3 --switch ovsk,protocols=OpenFlow13

Configure

sudo ovs-vsctl – set Bridge s1 netflow=@nf – --id=@nf create NetFlow target=\"127.0.0.1:2055\" active-timeout=10

and do an iperf from h1 to h2 .

Capture the streams…You will get multiple PDU samples.

Multiple PDU's needs to be captured but only one PDU is getting captured.