Question $2)$

Consider the following network of five hosts $($h$1$ to h$5),$ five Openflow switches $($s$1$ to s$5)$ and SDN controller cl $.$ The black solid lines indicate physical links between devices, and the orange dashed lines indicate logical channels between the controller and OpenFlow switches. The red numbers indicate the corresponding port number on each switch. the IP addresses are for hosts h$1$ to h$5.$

a$.$ Suppose we want to implement the routing tables from Q$1.$b in this network, with an additional rule that h$2$ should not be able to contact h$1$ and h$3.$ Assume that IP flows exist between every source$-$destination pair in this network. Determine the flow table entries that must be installed in each switch $(\backslash (\backslash$mathrm$\{$s$\}1,\backslash$mathrm$\{$~s$\}2,\backslash$mathrm$\{$~s$\}3,\backslash$mathrm$\{$~s$\}4\backslash )$ and s$5).$ Use the following format for entries:

b$.$ Create a mininet topology script that represents the network in Q$2.$a with bandwidth of $10$ Mbps and delay of $10$ ms for every link. Do NOT use Miniedit. Include a copy of your script in your assignment.

c$.$ Run mininet with your custom topology. Add your flows from part $($Q$2.$a$)$ to the tables of the switches using the following command:

sh ovs$-$ofctl add$-$flow $[$Switch$]$ ip$,$nw$\_$dst$=[$ip address$],$actions$=$output:$[$port$]$

For example:

sh ovs$-$ofctl add$-$flow sl ip$,$nw$\_$dst$=172\mathrm{.}31\mathrm{.}0\mathrm{.}1,$actions$=$output:$1$

Verify your flow tables using the $"$dpctl dump$-$flows" command from mininet CLI and include a screenshot of the results.

Once all flows are added, try "pingall". Is it successful? Explain the results.