Exercises pyretic firewall

Exercise: Pyretic Firewall

• Aim: Pyretic based firewall
• Topology [1]
• Put the following files([2]) in folder: pyretic/pyretic/examples

(20P) Run the pyretic hub example

 $ sudo mn --controller remote --topo=single,3 --mac --arp
 $ cd pyretic
 $ pyretic.py –v high pyretic.examples.pyretic_hub

• • Verify that the hosts can ping each other

 $ h1 ping h2 
 $ h1 ping h3

• • then

 $ mininet> xterm h1 h2 h3
 h2$ tcpdump -xx -n -i h2-eth0
 h3$ tcpdump -xx -n -i h3-eth0
 h1$ ping -c1 10.0.0.2

• • Observe what happens when you do

 h1$ ping -c1 10.0.0.5

• • Look into the hub code: pyretic/pyretic/examples/pyretic_hub

(20P) Run the pyretic switch example

 $ pyretic.py –v high pyretic.examples.pyretic_switch1

• • restart mininet

  $ sudo mn --controller remote --topo=single,3 --mac --arp

• • Verify that the hosts can ping each other

  mininet> xterm h1 h2 h3
  h2$ tcpdump -xx -n -i h2-eth0
  h3$ tcpdump -xx -n -i h3-eth0
  h1$ ping -c1 10.0.0.2

• • Observe what happens when you do

  h1$ ping -c1 10.0.0.5

• • Look into the switch code: pyretic/pyretic/examples/pyretic_switch1.py

(60P) Implement a layer 2 firewall that runs alongside the MAC learning module on the pyretic OpenFlow Controller

• • Your firewall should be agnostic to the underlying topology
  • Write code to block h1 to h2 and h2 to h1 (Mac IDs: 00:00:00:00:00:01, 00:00:00:00:00:02)
  • Start with pyretic_firewall.py
  • See in pyretic_firewall.py for instructions on how to test the code as well as how to write the code
  • To Test run:

  $ sudo mn --controller remote --topo=single,3 --mac --arp
  $ pyretic.py –v high pyretic.examples.pyretic_firewall