#!/usr/bin/python
from mininet.net import Mininet
from utils.FloodlightController import FloodlightController
from mininet.log import setLogLevel
import os,time

if __name__ == '__main__':
    #setLogLevel( 'info' )
    net = Mininet(controller=FloodlightController)
    #net.addController("controller1")

    num_nodes = 8
    for i in range(1,num_nodes):
        net.addHost("h%d"%i)
    for i in range(2,num_nodes):
        net.addLink("h%d"%i, "h%d"%(i-1))

    net.start()
    net.pingAll()
    net.stop()

*** Ping: testing ping reachability
h1 -> h2 X X X X X
h2 -> h1 X X X X X
h3 -> X X X X X X
h4 -> X X X X X X
h5 -> X X X X X X
h6 -> X X X X X X
h7 -> X X X X X X
*** Results: 95% dropped (2/42 received)

#!/usr/bin/python

from mininet.net import Mininet
from mininet.log import setLogLevel
import os,time

if __name__ == '__main__':
    #setLogLevel( 'info' )
    net = Mininet()

    num_nodes = 8
    hosts=[None] * num_nodes

    for i in range(1,num_nodes):
        hosts[i]=net.addHost("h%d"%i)
    for i in range(2,num_nodes,2):
        net.addLink(hosts[i], hosts[i-1])
    for i in range(3,num_nodes,2):
        net.addLink(hosts[i], hosts[i-1])

    net.start()
    net.pingAll()
    net.stop()

h1 -> h2 X X X X X
    h2 -> h1 X X X X X
    h3 -> X X h4 X X X
    h4 -> X X h3 X X X
    h5 -> X X X X h6 X
    h6 -> X X X X h5 X
    h7 -> X X X X X X

host.cmd('sysctl -w net.ipv4.ip_forward=1')

#!/usr/bin/python

from mininet.net import Mininet
from mininet.log import output

if __name__ == '__main__':

    net = Mininet()

    num_nodes = 8

    # from 1 to num_nodes
    for i in range(1,num_nodes+1):
        net.addHost('h%d'%i,ip=None)

    # from 1 to num_nodes-1 because the index starts from zero
    for i in range(1,num_nodes):

        h1 = net.hosts[i-1]
        h2 = net.hosts[i]

        net.addLink(h2, h1, intfName1 = '%s-eth0'%h2.name, intfName2 = '%s-eth1'%h1.name)
        h2.intf('%s-eth0'%h2.name).setIP('10.0.%d.1'%i, 24)
        h1.intf('%s-eth1'%h1.name).setIP('10.0.%d.2'%i, 24)

    net.start()

    # Ping forward and backward nodes
    for i in range(0,num_nodes):
        node = net.hosts[i]

        fwdNode, bwNode = None, None

        output('%s -> '%node.name)

        if i!=0:
            bwNode = net.hosts[i-1]
            bwIP = bwNode.IP('%s-eth1'%bwNode.name)
            result = node.cmd('ping -c1 %s'%bwIP)
            sent, received = net._parsePing(result)

            output(('%s '%bwNode.name) if received else 'X ')

        if i!=7:
            fwdNode = net.hosts[i+1]
            fwdIP = fwdNode.IP('%s-eth0'%fwdNode.name)
            result = node.cmd('ping -c1 %s'%fwdIP)
            sent, received = net._parsePing(result)

            output(('%s '%fwdNode.name) if received else 'X ')

        output('n')

    net.stop()

h1 -> h2
h2 -> h1 h3
h3 -> h2 h4
h4 -> h3 h5
h5 -> h4 h6
h6 -> h5 h7
h7 -> h6 h8
h8 -> h7