#!/usr/bin/python

from mininet.net import Mininet
from mininet.node import Controller, RemoteController, OVSController
from mininet.node import CPULimitedHost, Host, Node
from mininet.node import OVSKernelSwitch, UserSwitch
from mininet.node import IVSSwitch
from mininet.cli import CLI
from mininet.log import setLogLevel, info
from mininet.link import TCLink, Intf
from subprocess import call

def myNetwork():

    net = Mininet( topo=None,
                   build=False,
                   ipBase=‘10.0.0.0/8‘)

    info( ‘*** Adding controller\n‘ )
    info( ‘*** Add switches\n‘)
    r1 = net.addHost(‘r1‘, cls=Node, ip=‘0.0.0.0‘)
    r1.cmd(‘sysctl -w net.ipv4.ip_forward=1‘)
    r2 = net.addHost(‘r2‘, cls=Node, ip=‘0.0.0.0‘)
    r2.cmd(‘sysctl -w net.ipv4.ip_forward=1‘)
    r4 = net.addHost(‘r4‘, cls=Node, ip=‘0.0.0.0‘)
    r4.cmd(‘sysctl -w net.ipv4.ip_forward=1‘)
    r3 = net.addHost(‘r3‘, cls=Node, ip=‘0.0.0.0‘)
    r3.cmd(‘sysctl -w net.ipv4.ip_forward=1‘)

    info( ‘*** Add hosts\n‘)
    h2 = net.addHost(‘h2‘, cls=Host, ip=‘10.0.0.2‘, defaultRoute=None)
    h1 = net.addHost(‘h1‘, cls=Host, ip=‘10.0.0.1‘, defaultRoute=None)

    info( ‘*** Add links\n‘)
    net.addLink(h1, r1)
    net.addLink(h1, r2)
    net.addLink(r1, r3)
    net.addLink(r2, r3)
    net.addLink(r3, r4)
    net.addLink(r4, h2)

    info( ‘*** Starting network\n‘)
    net.build()
    info( ‘*** Starting controllers\n‘)
    for controller in net.controllers:
        controller.start()

    info( ‘*** Starting switches\n‘)

    info( ‘*** Post configure switches and hosts\n‘)
    h1.cmd(‘ifconfig h1-eth0 192.168.10.1/24‘)
    h1.cmd(‘ifconfig h1-eth1 192.168.16.1/24‘)

    r1.cmd(‘ifconfig r1-eth0 192.168.10.2/24‘)
    r1.cmd(‘ifconfig r1-eth1 192.168.20.1/24‘)

    r2.cmd(‘ifconfig r2-eth0 192.168.16.2/24‘)
    r2.cmd(‘ifconfig r2-eth1 192.168.30.1/24‘)

    r3.cmd(‘ifconfig r3-eth0 192.168.20.2/24‘)
    r3.cmd(‘ifconfig r3-eth1 192.168.30.2/24‘)

    r3.cmd(‘ifconfig r3-eth2 192.168.100.2/24‘)

    r4.cmd(‘ifconfig r4-eth0 192.168.100.1/24‘)
    r4.cmd(‘ifconfig r4-eth1 192.168.200.1/24‘)

    h2.cmd(‘ifconfig h2-eth0 192.168.200.2/24‘)


    h1.cmd("ip route add 192.168.10.1/24 dev h1-eth0 table 520")
    h1.cmd("ip route add default via 192.168.10.2 dev h1-eth0 table 520")


    h1.cmd("ip route add 192.168.16.1/24 dev h1-eth1 table 521")
    h1.cmd("ip route add default via 192.168.16.2 dev h1-eth1 table 521")

    #h1.cmd("ip route add default gw 192.168.10.2  dev h1-eth0")

    h1.cmd("ip rule add from 192.168.10.1 table 520")
    h1.cmd("ip rule add from 192.168.16.1 table 521")

    r1.cmd("ip route add default via 192.168.20.2 dev r1-eth1")
    r2.cmd("ip route add default via 192.168.30.2 dev r2-eth1")


    r3.cmd("ip route add 192.168.10.0/24 via 192.168.20.1 dev r3-eth0")
    r3.cmd("ip route add 192.168.16.0/24 via 192.168.30.1 dev r3-eth1")

    r3.cmd("ip route add 192.168.200.0/24 via 192.168.100.1 dev r3-eth2")


    r4.cmd("ip route add default via 192.168.100.2 dev r4-eth0")

    h2.cmd("ip route add default via 192.168.200.1 dev h2-eth0")

    CLI(net)
    net.stop()

if __name__ == ‘__main__‘:
    setLogLevel( ‘info‘ )
    myNetwork()