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diff --git a/examples/scratchnetuser.py b/examples/scratchnetuser.py
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+#!/usr/bin/python
+
+"""
+Build a simple network from scratch, using mininet primitives.
+This is more complicated than using the higher-level classes,
+but it exposes the configuration details and allows customization.
+
+For most tasks, the higher-level API will be preferable.
+
+This version uses the user datapath and an explicit control network.
+"""
+
+from mininet.net import Mininet
+from mininet.node import Node
+from mininet.link import Link
+from mininet.log import setLogLevel, info
+
+def linkIntfs( node1, node2 ):
+ "Create link from node1 to node2 and return intfs"
+ link = Link( node1, node2 )
+ return link.intf1, link.intf2
+
+def scratchNetUser( cname='controller', cargs='ptcp:' ):
+ "Create network from scratch using user switch."
+
+ # It's not strictly necessary for the controller and switches
+ # to be in separate namespaces. For performance, they probably
+ # should be in the root namespace. However, it's interesting to
+ # see how they could work even if they are in separate namespaces.
+
+ info( '*** Creating Network\n' )
+ controller = Node( 'c0' )
+ switch = Node( 's0')
+ h0 = Node( 'h0' )
+ h1 = Node( 'h1' )
+ cintf, sintf = linkIntfs( controller, switch )
+ h0intf, sintf1 = linkIntfs( h0, switch )
+ h1intf, sintf2 = linkIntfs( h1, switch )
+
+ info( '*** Configuring control network\n' )
+ controller.setIP( '10.0.123.1/24', intf=cintf )
+ switch.setIP( '10.0.123.2/24', intf=sintf)
+
+ info( '*** Configuring hosts\n' )
+ h0.setIP( '192.168.123.1/24', intf=h0intf )
+ h1.setIP( '192.168.123.2/24', intf=h1intf )
+
+ info( '*** Network state:\n' )
+ for node in controller, switch, h0, h1:
+ info( str( node ) + '\n' )
+
+ info( '*** Starting controller and user datapath\n' )
+ controller.cmd( cname + ' ' + cargs + '&' )
+ switch.cmd( 'ifconfig lo 127.0.0.1' )
+ intfs = [ str( i ) for i in sintf1, sintf2 ]
+ switch.cmd( 'ofdatapath -i ' + ','.join( intfs ) + ' ptcp: &' )
+ switch.cmd( 'ofprotocol tcp:' + controller.IP() + ' tcp:localhost &' )
+
+ info( '*** Running test\n' )
+ h0.cmdPrint( 'ping -c1 ' + h1.IP() )
+
+ info( '*** Stopping network\n' )
+ controller.cmd( 'kill %' + cname )
+ switch.cmd( 'kill %ofdatapath' )
+ switch.cmd( 'kill %ofprotocol' )
+ switch.deleteIntfs()
+ info( '\n' )
+
+if __name__ == '__main__':
+ setLogLevel( 'info' )
+ info( '*** Scratch network demo (user datapath)\n' )
+ Mininet.init()
+ scratchNetUser()