User Tools

Site Tools


Basic Lab Setup

For this lab sessions, we are using your host machine as the ssh client and your Ubuntu VM as the ssh server.

Please download following applications

  • PuTTY (the Telnet and SSH client itself)
  • PuTTYgen (an RSA and DSA key generation utility

Setting up virtualbox

Installation of virtualbox and Downloading Ubuntu iso image

  • Download and install virtualbox latest
  • Download Ubuntu 18.04 Ubuntu image from the official ubuntu website
  • Note down the location of downloaded iso file

Creating the VM

Start virtualbox and Click on New button (at top-right) to create new virtual machine Enter name of the VM as: Ubuntu. Select OS Type: Linux Select Version: Ubuntu (64-bit) Then click on Continue button

  • Set VM's memory size to 1024MB and click on Continue button
  • Set VM's hard disk option to Create a virtual hard disk now and then click on Create
  • Select disk type to VDI
  • Select storage type to Dynamically Allocated and Continue
  • adjust the disk size to 12.0GB and click on Create to create the VM

This might take couple of minutes

(Note down the location of vdi image file when virtualbox flashes it on the screen)

Setting up Network Interface

  • Select the VM from left panel on Virtual box, right click and open Settings
  • Click on the Network title
  • On Adapter 1 While Enable Network Adapter selected choose Attached to be Bride Adapter. This virtual interface will work as the WAN port of the firewall (Can be connect from out side).

Setting up boot device and Booting

  • Click on Storage title and select CD ROM icon with Caption “Empty” under the Controller:IDE, Click on CD ROM icon under the Attribute on the left side to select
  • Choose Virtual Optical Disk File
  • Locate the Ubuntu CD Image file you downloaded. Press OK to close the settings window.
  • Right click on VM and select Start to make a Normal Start. You should now see a separate window with Installation screen“


Installation is quite simple. You can figure it out your self; (Next… Next… Next) If asked, make sure you select Install OpenSSH Server. We may also not need any Feature Server snaps at the moment.

Detailed installation guide can be found in the ubuntu official documentation

Setting UP IP Addresses

After you install the Ubuntu OS, change the IP address.

Run the commands below to create a new network configuration file

sudo vi /etc/netplan/50-cloud-init.yaml

Press i to edit the file

Then configure IP addresses as shown below

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
 version: 2
 renderer: networkd
            dhcp4: false
            dhcp6: false
            accept-ra: no
                - <Your IPv4 Address>/<subnet>
                - <Your IPv6 Address>/<subnet>
            gateway4: <Your IPv4 Gateway>
            gateway6: <Your IPv6 Gateway>
                  - <Your IPv6 DNS>
                  - <Your IPv4 DNS>

Exit and save your changes by pressing esc and type :wq

Run the commands below.

sudo netplan apply

Then check the connectivity by pinging your favorite destination.

lknog3/netops/setup.txt · Last modified: 2023/01/31 14:21 by