Unable to set correctly a firewall in mininet with sdn and opeflow ovs (UDP Version )

Question

I'm experimenting with mininet in ubuntu 14 in order to create a basic firewall which blocks the udp packets from one host ( h1= 10.0.0.1 ) to another ( h4= 10.0.0.4 ).

Those hosts are in the same vlan and in different switchs (if that can be of any help). Also I would like to block it the udp packets which the destination port as 5001.

To do it so, i have launch two xterm in h1(in mininet) in order to check the ping is working correctly and also launch the packets to h4. xterm h1: "iperf -u -c10.0.0.4 -p 5001 -i 5 -b 200K -t 360".

In mininet I also have open a xterm h4 to set it up as a server listening in the port 5001. xterm h4: "iperf -s -u -p 5001 -i 5​".

When I guess the rule I have to introduce is this one "sh ovs-ofctl add-flow s1 udp_dst=5001,nw_proto=17,actions=drop"

But, it doesnt work due to the packets are still arriving. The ping works fine, but ( and here comes the main problem) the packet arrives at the server and it shouldn't.

Any help please?

Thank you very much

Here I leave you the screenshots of the network topology and also what I appear in the xterm windows.