The aim of Ghost Port Scan is to provide administrators and pen-testers with a tool that allow them to easily test firewalls and get information from a remote host. GPS is a port scanner and a firewall rules disclosure (FWRD) tool, which uses IP spoofing, ARP poisoning and some other stratagems in order to perform a stealth and untrackable information collect. As far as GPS needs to sniff the responses from the target host, it requires to be run using a loopback or an ethernet interface (including cable modem).