How To: Build an ARP Scanner Using Scapy and Python
As you might know, there are a multitude of tools used to discover internal IP addresses. Many of these tools use ARP, address resolution protocol, in order to find live internal hosts. If we could write a script using this protocol, we would be able to scan for hosts on a given network. This is where scapy and python come in, scapy has modules we can import into python, enabling us to construct some tools of our own, which is exactly what we'll be doing here.