In this hands-on project, you view and modify the TCP/IP configuration of your network i...

In this hands-on project, you view and modify the TCP/IP configuration of your network interface.

1. Turn on your computer. After your Linux system has been loaded, log in to the GNOME Desktop Environment using the user name of sample user one and the password of secret.

2. Navigate to the System menu, Administration, Network. Supply the root password of secret when prompted and click OK.

3. View the network interfaces listed on the Devices tab. How many wired or wireless NICs do you have? Click the Hardware tab. What drivers are listed for your NICs?

4. Click the Devices tab again. Highlight the network interface that you use to gain access to your network and click the Edit button. When the Ethernet Device screen appears, observe the current TCP/IP settings. When were these configured? Ensure that Enable IPv6 configuration for this interface is selected and click OK.

5. Click the File menu and choose Save. Click OK when the information message appears, close the Network Configuration window, and log out of the GNOME Desktop Environment.

6. Switch to a command-line terminal (tty2) by pressing Ctrl+Alt+F2 and log in to the terminal using the user name of root and the password of secret.

7. At the command prompt, type service network restart and press Enter to restart your network after making changes to your TCP/IP configuration. Next, type ifconfig and press Enter. What IPv4 and IPv6 configuration do you see?

8. Using an editor such as vi, edit the /etc/sysconfig/network-scripts/ifcfg-interface file, where interface is the network interface that you use to connect to your network. Do the entries contain the correct information? Change the fourth number in your IPv4 address so that it is incremented by 1. Save your changes and quit the editor to return to the command prompt.

9. At the command prompt, type ifdown interface; ifup interface and press Enter, where interface is the network interface that you use to connect to your network.

10. At the command prompt, type ifconfig and press Enter. Was your IPv4 address changed?

11. Using an editor such as vi, edit the /etc/sysconfig/network-scripts/ifcfg-interface file where interface is the network interface that you use to connect to your network. Change your IPv4 address back to its original value. Save your changes and quit the editor to return to the command prompt.

12. At the command prompt, type ifdown interface; ifup interface and press Enter, where interface is the network interface that you use to connect to your network.

13. At the command prompt, type ifconfig and press Enter. What configuration do you see? Why?

14. At the command prompt, type ping interfaceIP and press Enter, where interfaceIP is the IPv4 address of the network interface that you use to connect to your network. Do you receive ping responses from your network interface? Press Ctrl+c when finished to quit the ping command.

15. At the command prompt, type netstat -i and press Enter. View the statistics for your network interfaces. If necessary, consult the netstat manual page to determine the meaning of each column displayed.

16. Type exit and press Enter to log out of your shell.