#!/usr/bin/python

# wyu@ateneo.edu

# import libraries

from mininet.net import Mininet

from mininet.node import RemoteController

import thread

import time

# ping forever function

def ping_thread (threadName, src, dst):

while (1):

time.sleep(1)

print src.cmd('ping -c1 %s' % dst.IP())

# setup mininet network

net = Mininet()

c0 = net.addController('c0')

s0 = net.addSwitch('s0')

h0 = net.addHost('h0')

h1 = net.addHost('h1')

net.addLink(s0, h0)

net.addLink(s0, h1)

# start network and test

net.start()

# do the actual test and run forever

thread.start_new_thread(ping_thread, ("pinging thread", h0, h1))

# wait 10 seconds before killing the network

time.sleep(10)

net.configLinkStatus("s0", "h1", "down")

# stop network

net.stop()