Lab 3: Simple Firewall using OpenFlowFirewall代写 his lab builds on the knowledge acquired through Lab 1 where you were first introduced to the Mininet environment. It will alsoThis lab builds on the knowledge acquired through Lab 1 where you were first introduced to the Mininet environment. It will also help you prepare for the class project. In Lab 1, you were introduced to some basic functionality of Mininet. In this lab, we will take that one step further by introducing you to Software-Defined Networking (SDN) and the OpenFlow protocol.Firewall代写Software-Defined Networking OpenFlow:Firewall代写Software-Defined Networking (SDN) is a recently proposed networking paradigm in which the data and the control planes are decoupled from one another. One can think of the control plane as being the network’s “brain”, i.e., it is responsible for making all decisions, for example, how to forward data, while the data plane is what actually moves the data. In traditional networks, both the control- and data planes are tightly integrated and implemented in the forwarding devices that comprise a network.Firewall代写The SDN control plane is implemented by the “controller” and the data plane by “switches”. The controller acts as the “brain” of the network, and sends commands (a.k.a. “rules”) to the switches on how to handle traffic. OpenFlow has emerged as the de facto SDN standard and specifies how the controller and the switches communicate as well as the rules controllers install on switches.Firewall代写Mininet and OpenFlow:In Lab 1, we experimented with Mininet using its internal controller. In this lab (and the final project), we will instead be using our own controller to send commands to the switches. We will be using the POX controller, which is written in Python.OpenFlow 1.3 Overview:OpenFlow 1.3 is the version of the OpenFlow protocol supported within the Mininet environment. The following diagram explains the operation of OpenFlow switches.Firewall代写Note that when the packet comes into an OpenFlow switch, the switch will reference a table containing “rules” and “actions”. This “flow” table contains the following fields:The figure below shows the flow of execution that follows. If an ofp_packet_in does not match any of the flow entries and the flow table does not have a “table-miss” flow entry, the packet will be dropped. If the packet matches the “table-miss” flow entry, it will be forwarded to the controller. If there is a match-entry for the packet, the switch will execute the action stored in the instruction field of the corresponding flow table.Firewall代写All of the figures and information in this section are from the OpenFlow 1.3 specification, which you can reference if you would like additional informationAssignment:Firewall代写The python files are available in a zip file here.For this assignment you will create a simple firewall using OpenFlow-enabled switches. The term “firewall” is derived from building construction: a firewall is a wall you place in buildings to stop a fire from spreading. In the case of networking, it is the act of providing security by not letting specified traffic pass through the firewall. This feature is good for minimizing attack vectors and limiting the network “surface” exposed to attackers.In this Lab, we will provide you with the Mininet configuration, lab3.py, to setup your network which assumes a remote controller listening on the default IP address and port number 127.0.0.1:6633. You do not need to (and should not) modify this file.Firewall代写In this Lab, we will also provide you with a skeleton POX controller: lab3controller.py. This file will be where you will make your modifications to create the firewall.Running the Code:To run the controller, place lab3controller.py in the ~/pox/pox/misc directory. You can then launch the controller with the command sudo ~/pox/pox.py misc.lab3controllerTo run the mininet file, place it in ~ and run the command sudo python ~/lab3.py Firewall代写To do this assignment, you will need to be running both files at the same time (in 2 different terminal windows).The topology that will be created will look as follows:Firewall代写Rules:The rules that you will need to implement in OpenFlow for this assignment are:

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