How to Install GNS3 on OpenBSD

GNS3 is a popular network simulation tool used to design, configure, and test network topologies. In this tutorial, you will learn how to install GNS3 on OpenBSD.

Prerequisites

Before proceeding with the installation, make sure to have the following prerequisites:

  • OpenBSD operating system installed
  • internet access

Step 1: Install Required Packages

Open the terminal and enter the following command as root to install the required packages:

pkg_add py3-pip git xauth wireshark

Step 2: Install GNS3

In this step, we will install GNS3 using pip.

  1. Enter the following command to install the latest stable release of GNS3:
pip3 install gns3-server
  1. Clone the GNS3 GUI repository using git:
git clone https://github.com/GNS3/gns3-gui.git
  1. Change the directory to the gns3-gui:
cd gns3-gui
  1. Enter the following command to install GNS3 GUI:
pip3 install -r requirements.txt
python3 setup.py install

Step 3: Configure X11 Forwarding

GNS3 GUI requires X11 forwarding to display the graphical interface.

  1. Open the terminal and enter the following command to install xauth:
pkg_add xauth
  1. Enable X11 forwarding by editing the sshd_config file:
sudo vi /etc/ssh/sshd_config

Add the following line at the end of the file:

X11Forwarding yes

Save and close the file.

  1. Restart the sshd service to apply the new configuration:
sudo rcctl restart sshd
  1. Open a new terminal and enter the following command to forward X11 traffic to your local machine:
ssh -Y username@remote_host

Step 4: Start GNS3

  1. Open the terminal and enter the following command to start the GNS3 server:
gns3server
  1. Open a new terminal and enter the following command to start the GNS3 GUI:
gns3
  1. The GNS3 GUI should appear on your local machine.

Congratulations! You have successfully installed GNS3 on OpenBSD. You can now use it to simulate and test network topologies.