multicast join failed: No such device
If you try to generate multicast traffic with iperf, this message could probably appear, especially if you are using mininet: multicast join failed: No such device To solve it, you need to create an entry in the route table for multicast traffic like this: ip route add 224.0.0.0/4 dev eth0 On the server side use: iperf -s -u -B 225.0.0.5 -i 1 On the client side use: iperf -c 225.0.0.5 -i -i 1 -l 100 -b 1k Enjoy it!