NePA TesT: Community Network Emulator

#!/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.

This version uses the user datapath.

"""

from mininet.mininet import init, Node, createLink

def scratchNetUser( cname='controller', cargs='ptcp:'):

   # Create Network

   # 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.

   controller = Node( 'c0' )

   switch = Node( 's0')

   h0 = Node( 'h0' )

   h1 = Node( 'h1' )

   createLink( controller, switch )

   createLink( h0, switch )

   createLink( h1, switch )

   # Configure control network

   controller.setIP( controller.intfs[ 0 ], '10.0.123.1', '/24' )

   switch.setIP( switch.intfs[ 0 ], '10.0.123.2', '/24' )

   # Configure hosts

   h0.setIP( h0.intfs[ 0 ], '192.168.123.1', '/24' )

   h1.setIP( h1.intfs[ 0 ], '192.168.123.2', '/24' )

   # Start network using user datapath

   controller.cmdPrint( cname + ' ' + cargs + '&' )

   switch.cmdPrint( 'ifconfig lo 127.0.0.1' )

   switch.cmdPrint( 'ofdatapath -i ' + ','.join( switch.intfs[ 1: ]) 

      + ' ptcp: &' )

   switch.cmdPrint( 'ofprotocol tcp:' + controller.IP() + ' tcp:localhost &' )

   # Run test

   h0.cmdPrint( 'ping -c1 ' + h1.IP() )

   # Stop network

   controller.cmdPrint( 'kill %' + cname)

   switch.cmdPrint( 'kill %ofdatapath' )

   switch.cmdPrint( 'kill %ofprotocol' )

if __name__ == '__main__':

   init()   

   scratchNetUser()