(Honeyd is a small daemon capable of creating virtual hosts on the network. The services and TCP of this virtual host can be configured to appear to the network as running an operating system. Honeyd can make a host simulate multiple addresses in the LAN to satisfy the request of the network experiment environment. Virtual hosts can be pinged, and they can be tracerouted. By setting the configuration file, the virtual computer can simulate running any service. It has a lot of libraries, so it is difficult to compile and install Honeyd.)