Hands$-$On Project $2-11$ Access and Work with an ARP Table in Linux

TIME REQUIRED: $10$ minutes

OBJECTIVE: Use the ARP utility on the command$-$line interface to examine and manipulate your Ubuntu Linux computer$$s ARP table.

DESCRIPTION: ARP isn$$t specific to the Windows operating system and can also be used on a Linux computer. The computer used in this exercise was Ubuntu $14\mathrm{.}04\mathrm{.}3$ LTS$,$ but the commands should work on any distribution of Linux. The terminal used was a bash shell, which is the default shell for Ubuntu. Note that this exercise used Ubuntu Live booting from a USB drive.

$1.$

Open a command prompt window. $($Use the Ubutnu search feature, type terminal and then double$-$click on the terminal icon. A command$-$prompt window opens.$)$

$2.$

At the prompt, type arp and press Enter. Note the output.

$3.$

Type arp $-$a and press Enter and notice how the same information is displayed, but in a different format.

$4.$

Type arp $-$v and press Enter to view the verbose output of the command.

$5.$

Attempt to delete the ARP table by typing arp $-$d hostname, where $$hostname$$ is the name of your Linux computer, and then press Enter. Notice that the action isn$$t permitted. It requires root access to perform this action on a Linux computer.

$6.$

Type sudo arp $-$d hostname, where $$hostname$$ is the name of your Linux computer, and then press Enter $($you may be prompted to enter your password$).$ Notice the ARP table is empty or greatly reduced.

$7.$

At the prompt, type exit and then press Enter to close the terminal.

$($answer these questions by screen shots and notes about them$)$