diff --git a/.gitignore b/.gitignore
old mode 100644
new mode 100755
diff --git a/emuvim/api/zerorpcapi_DCNetwork.py b/emuvim/api/zerorpcapi_DCNetwork.py
old mode 100644
new mode 100755
index 24becd3..b60093d
--- a/emuvim/api/zerorpcapi_DCNetwork.py
+++ b/emuvim/api/zerorpcapi_DCNetwork.py
@@ -34,9 +34,12 @@
         python_install_path = site.getsitepackages()[0]
         ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
         ryu_path2 =  python_install_path + '/ryu/app/ofctl_rest.py'
+        # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
+        # Ryu still uses 6633 as default
+        ryu_option = '--ofp-tcp-listen-port'
+        ryu_of_port = '6653'
         ryu_cmd =  'ryu-manager'
-        self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2])
-
+        self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port])
 
     def connectDCNetwork(self, net):
         self.net = net
diff --git a/emuvim/cli/monitor.py b/emuvim/cli/monitor.py
old mode 100644
new mode 100755
diff --git a/emuvim/dcemulator/monitoring.py b/emuvim/dcemulator/monitoring.py
old mode 100644
new mode 100755
diff --git a/emuvim/dcemulator/net.py b/emuvim/dcemulator/net.py
index 609d46c..324c4d3 100755
--- a/emuvim/dcemulator/net.py
+++ b/emuvim/dcemulator/net.py
@@ -27,9 +27,11 @@
         self.dcs = {}
         # create a Mininet/Dockernet network
         # call original Docker.__init__ and setup default controller
+        #Dockernet.__init__(
+        #    self, controller=RemoteController, switch=OVSKernelSwitch, **kwargs)
         Dockernet.__init__(
             self, controller=RemoteController, switch=OVSKernelSwitch, **kwargs)
-        self.addController('c0')
+        self.addController('c0', controller=RemoteController)
 
         # graph of the complete DC network
         self.DCNetwork_graph=nx.DiGraph()
diff --git a/emuvim/example_topology.py b/emuvim/example_topology.py
index 9412863..2342fd1 100755
--- a/emuvim/example_topology.py
+++ b/emuvim/example_topology.py
@@ -37,7 +37,6 @@
     mon_api = ZeroRpcApiEndpointDCNetwork("0.0.0.0", 5151)
     mon_api.connectDCNetwork(net)
     mon_api.start()
-
     """
     2. Add (logical) data centers to the topology
        (each data center is one "bigswitch" in our simplified