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IPv4 Routing Assignment


In this experiment you will learn how to set up static routing with the route command. We will use the following network topology for this experiment:
route topology


For this tutorial you need :


All the tools will already be installed at your nodes. For your reference we are going to use:

Where to get help:

For any questions or problem with the tutorial ask your TA or Professor for help. If you are doing this exercise outside the context of a course, please email

Set Up

This experiment assumes you have already setup your account at the GENI Portal. In particular ensure that:

  1. You can login to the GENI Portal
  2. You are a member of a GENI Project (there is at least a project listed under the Projects tab.
  3. You have setup your ssh keys (there is at least one key listed under the Profile->SSH Keys tab.

Question 1

Hand in: A screenshot of the topology after it is ready from Flack.


The goal of this exercise is to setup the routing as indicated in Figure 1; i.e. packets from A send to IP address on node C should be routed via node B. The default behavior between your nodes is different.

Question 2

Verify the default routing behavior using the traceroute linux command.

Hand in: Screenshots with the output of the traceroutes commands.

Question 3

Use the linux route command to create static routes that match the routing behavior of the diagram.

Hand in:The routing commands your ran. The final route configuration.

Question 4

Verify that you have created the intended routing behavior using traceroute.

Hand in: Screenshots from node A that shows traceroutes for both IP addresses of node C.


  • Remember that you can use “ifconfig” to determine which Ethernet interface (e.g., eth0) is bound to what IP address at each of the nodes.
  • In order to enable forwarding of packets on node B you have to execute the following command:
    echo 1 > /proc/sys/net/ipv4/ip_forward
  • A new slice will always be in its initial state with NO routing set up!


  1. Return to the Slice page on Portal. On the row in the aggregate table for the aggregate you used, press the Delete Resources button.
  2. When prompted, confirm that you want to delete this sliver. Then, make sure you see a message that you have successfully deleted resources at this aggregate.
  3. Do this for as many aggregates as you got resources from.

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