Honeyd is a small daemon that creates virtual hosts on a network.
The hosts can be configured to run arbitrary services, and their
personality can be adapted so that they appear to be running certain
operating systems. Honeyd enables a single host to claim multiple
addresses - I have 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.

Homepage:
https://www.honeyd.org/
