[header] How to construct a basic arp packet using colasoft packet builder for windows 7 [title] Go to the command prompt for both computers. [step] You can get to the command prompt by searching cmd from the windows start menu search bar or start-] all programs-] accessories. [title] Enter the command ipconfig. 
[step] This will display the ip addresses for the ethernet adapters installed in the computers. You should see a list of addresses appear on the screen.