Honeyd: An open source honeypot

that creates virtual hosts on a network. These hosts can be can be adapted so that they appear to be running certain operating systems. Honeyd enables a single host to claim multiple addresses (tested up to 65536) on a LAN for network simulation. Honeyd improves cyber security by providing mechanisms for threat detection and assessment. It also deters adversaries by hiding real systems in the middle of virtual systems.

requests such as ICMP Ping, requests on UDP ports, TCP and services. This reply is interpreted by the scanning tool as a system running a corresponding service.