PYTHONPATH=. ryu-manager zta_ai_ddos_controller_1.py 


sudo mn --controller=remote --switch ovs,protocols=OpenFlow13
mininet> pingall


h2 iperf -s &
h1 iperf -c 10.0.0.2 -t 10
sh ovs-ofctl -O OpenFlow13 dump-flows s1 | grep -i "nw_src"