Cannot find required executable controller
This is a typical problem when you try to run mininet topologies created with miniedit.py Cannot find required executable controller. Please make sure that it is installed and available in your $PATH: Many blogs said that the solution is rename ovs-controller to controller sudo ln /usr/bin/ovs-controller /usr/bin/controller , but ovs-controller does not exist anymore. This is, because ovs-controller has been renamed test-controller. To solve it, you need to create a symbolic link to ovs-testcontroller that is called controller. Install openvswitch-testcontroller if you don't have it. sudo apt-get install openvswitch-testcontroller sudo ln /usr/bin/ovs-testcontroller /usr/bin/controller