Scapy is a (mostly) cross-platform packet manipulation tool. This allows you to craft and edit packets that you then send to other hosts when you open a socket. This is incredibly useful for, for example, capturing a packet being sent to you, manipulating the payload, and passing the packet on to another host. This is a pretty common, albeit slightly more advanced, method of security testing. Installing Scapy is a pretty straight forward process, if a tad bit time consuming compared to something coming in from a standard package. Before you get started, make sure you have the OS X Developer Tools installed from the Mac App Store. Also, make…