Task A3: Basic Network Configuration

Documentation

a) Basic information

1. Basic ideas about Linux networking : Linux netwoking basics
2. Working with VirtualBox networking modes: VirtualBox networking modes
3. Description and examples of the ip command: The ip command
4. What is the network manager?: The network manager

b) Introducing sudo

1. Basic ideas about sudo : sudo

Practical exercise

Part one: Working with bridge adapter on VirtualBox

1. 1.-Change on VirtualBox the parameter Attached to of the Network configuration section to Bridge Adapter.
2. 2.-Select your wireless card as interface to work as a bridge between your virtual computer and the network.
3. 3.-Boot your virtual computer

Part two: Adding your user to the group sudo

1. 1.-Add your user to the group sudo.
2. 2.-Check that your user is member of the group sudo.

Part three: Showing your network configuration. Testing connectivity

1. 1.-With the help of Network Manager shows clearly:
   • a) Network Interface identifier of your network card.
   • b) MAC (or hardware) address of your network card.
   • c) IP address of your computer.
   • d) IP address of the Gateway (Router) on your local network.
   • e) IP addresses of the primary and secondary DNS servers queried by computers on your local network.
2. 2.-With the help of Network Manager shows clearly the configuration Method of your computer.
3. 3.-With the help of commands shows clearly:
   • a) The ethernet interface identifier.
   • b) MAC (or hardware) address of your ethernet interface.
   • c) IP address of your computer.
   • d) IP address of the Gateway (Router) on your local network.
   • e) IP addresses of the primary and secondary DNS servers queried by computers on your local network.
4. 4.-With the help of commands tests the connectivity of your computer to:
   • a) www.google.com. Is there connectivity?. How do you know it?.
   • b) IP address 7.7.7.7. Is there connectivity?. Why?.
5. 5.-Find out the public IP address of www.google.com.

Part four: Basic management of your network settings with Network Manager

1. 1.-Manually configure your ethernet interface using Network Manager:
   • Step 1: Select Network Manager --> Edit Connections --> Wired Connection 1 --> IPv4 Settings
   • Step 2: Configure your Ethernet inteface:
     • Configuration method: Manual
     • IP addres: 192.168.1.40 to 192.168.1.60 (An IP will be assigned by the teacher for each student)
     • Netmask: 20 (or 255.255.240.0)
     • Gateway (IP addres of your Router): 192.168.1.1
     • Primary DNS: 80.58.0.33
     • Secondary DNS: 1.1.1.1
   • Step 3: Save your new configuration -> Close the Network Manager window.
   • Step 4: Disable the networking system using Network Manager.
   • Step 5: Enable the networking system using Network Manager.
2. 2.-With the help of Network Manager shows clearly the network configuration of your virtual computer.
3. 3.-With the help of commands shown clearly:
   • a) The ethernet interface identifier.
   • b) MAC (or hardware) address of your ethernet interface.
   • c) IP address of your computer.
   • d) IP address of the Gateway (Router) on your local network.
   • e) IP addresses of the primary and secondary DNS servers queried by computers on your local network.

Part five: Basic management of your network settings with commands

1. 1.-Stop the Network manager. Run: sudo systemctl stop NetworkManager
2. 2.-Configure your Ethernet inteface:
   • Remove the current IP address and mask. Check documentation section b.4 (It is an example. You have to adapt the command to your particular case).
   • New IP addres: 192.168.2.40 to 192.168.2.60 (An IP will be assigned by the teacher for each student) and Netmask: 24 (or 255.255.255.0). Check documentation section b.5 (It is an example. You have to adapt the command to your particular case).
   • New Gateway (IP addres of your Router): 192.168.2.1. Check documentation section b.7 (It is an example. You have to adapt the command to your particular case).
3. 3.-With the help of commands shown clearly:
   • a) IP address of your computer.
   • b) IP address of the Gateway (Router) on your local network.

Part six: Return to the initial conditions of the network configuration

1. 1.-Start again the Network manager. Run: sudo systemctl start NetworkManager
2. 2.-Configure again your network interface using the Automatic (DHCP) method with the help of Network Manager.
3. 3-Show again the network configuration with the help of Network manager.

Part seven: Checking your configuration

1. 1-VirtualBox is attached to your physical wireless card
2. 2-Your user is member of sudo
3. 3-Shows your configuration with Network Manager. What is your IP address?
4. 4-Shows your configuration with commands. What is the IP address of the Router?
5. 5-Test connectivity to google.com. Is there connectivity or not?. Why?.
6. 6-Test connectivity to 7.7.7.7. Is there connectivity or not?. Why?.
7. 7.-What is the IP address of google.com?
8. 8.-Change your Network configuration with Network Manager according to the settings asked in the Fourth part. Show the new configuration using commands.
9. 9.-Change your Network configuration with commands according to the settings asked in the Fifth part. Show the new configuration using commands.
10. 10.-Return to the initial conditions of the network configuration. Show the new configuration using Network Manager.