Wednesday, November 25, 2009

Add the ARP Gadget to your troubleshooting toolbox

The Address Resolution Protocol (ARP) is a key TCP/IP protocol that is used to determine the physical address of the network card that corresponds to an IP address. When you’re troubleshooting TCP/IP connectivity problems on a Windows network, you may need to investigate or modify the ARP cache as you look for problems.

Windows comes with a command-line utility called ARP, which you can use to display or adjust the contents of the ARP cache of either a local or remote system. To make the tool easier to use, I created the ARP Gadget, which automates the ARP command.