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!

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