learn how to build sdn network using mininet

Learn how to build sdn network using mininet

Setup the virtual machine and install necessary software

Setup the virtual machine

First you must download the virtual machine.Then open the virtual machine.
https://github.com/mininet/mininet/releases

In this window you can give name and the location for the your virtual machine.

For the networking purpose you must add the two network adapter.Click the "Edit virtual machine settings"

Network adapter 1  :NAT
Network adapter 2  : VMNET(Host-only)

For give the custom IP address and DHCP you must select the Custom selection on the connection settings.

Open the virtual network editor for create the Custom virtual network.The Give the IP address as you like.

Subnet ip (10.0.13.0)

Subnet mask 255.255.255.0

The go to the DHCP settings string ip address as 10.0.13.1 Ending IP 10.0.13.254

Then click OK

Start the virtual machine and Login using below credentials 

Username: mininet
Password: mininet

Then give the below commands to set the eth1 adapter.

#sudo ifconfig eth1 up
#sudo dhclient eth1

Then give the "ifconfig" to view the available Ethernet adapter and the ip address

Install the Xming

You can download the Xming from below link freely.then install it.

https://sourceforge.net/projects/xming/

(Only included necessary screenshots )

Install the mobaXterm

For the SSH client Install the mobaxterm. You can download the home edition freely

https://mobaxterm.mobatek.net/download.html

Create SDN network using default topology 

There two method of creating SDN network 
                                    1. Default topology
                                    2. Custom topology 

In below command it will create the default topology it will include the one switch and two hosts.

#sudo mn

you can delete the created topology using below command.you must delete the every previous topology before creating another one.

# sudo mn -c 

For the view the created topology give the below command.Make sure this command work in mininet prompt only.  

#net

you can ping the two hosts using below command.

# h1 ping h2

also in the mininet prompt you can run any command

#h1 ifconfig

#h1 hostname

also can get a separate window for any client using xterm

# xterm h1

Create the network using custom topology

For create the custom topology you must write the python program.The figure 1 show the topology that we build in this.

###################Import libraries##############

from mininet.net import Mininet
from mininet.node import Controller, OVSKernelSwitch, RemoteController
from mininet.cli import CLI
from mininet.log import setLogLevel, info

#############################################
def emptyNet():


    net = Mininet(controller=RemoteController, switch=OVSKernelSwitch)

############Add the conteoller informations#######

    c1 = net.addController('c1', controller=RemoteController, ip="127.0.0.1", port=6633)

#############################################

#############add the h1 ,h2 hosts and s1 switch ####

    h1 = net.addHost( 'h1', ip='10.0.0.1' )
    h2 = net.addHost( 'h2', ip='10.0.0.2' )

    s1 = net.addSwitch( 's1' )

############################################

##### create the links between switch and hosts#####

    s1.linkTo( h1 )
    s1.linkTo( h2 )

###########################################


######## start the controller and and switch#######

    net.build()
    c1.start()
    s1.start([c1])

##########################################

    CLI( net )
    net.stop()

if __name__ == '__main__':
    setLogLevel( 'info' )
    emptyNet()

Download Link : https://drive.google.com/file/d/1mqJZty09bA93lirOTNjfONbKeI-8m3gI/view?usp=sharing

Figure 1

In the first you must run the controller In this we use pox controller.pox is the python base controller freely available.first go to pox directory to run the controller or you can give absolute path then run the controller.

#cd pox/
#sudo python ./pox.py

After that you must duplicate the session and get another terminal.

Create the directory and save the topology code in that location.

# mkdir my

#cd my/

# vim topo1.py

 You can view the  file using cat command
# cat topo1.py

To run the code must give the below command

#sudo python ,.topo1.py

After creating the topology you must set the routing or switching between devices.

# vim script1.sh 

then give the created script file to the execute permission.then run the script

#chmod +x script1.sh
# ./script1.sh


############################################################
#!/bin/bash

######################specify the output port for destination ########

sudo ovs-ofctl add-flow s1 eth_type=0x800,nw_src=10.0.0.1,nw_dst=10.0.0.2,actions=output:2
sudo ovs-ofctl add-flow s1 eth_type=0x800,nw_src=10.0.0.2,nw_dst=10.0.0.1,actions=output:1

############################################################

###########################Allow the ARP messages ############

sudo ovs-ofctl add-flow s1 eth_type=0x806,actions=output:ALL

###########################################################

Download : https://drive.google.com/open?id=1E9Q5IEPRDDjf5pIfOxwgMXVKWVM3oJnn