In today's world, information is one of the most valuable asset. Intrusion detection is a significant focus of research in the security of computer systems and networks. As the network of computers expands both in number of hosts connected and number of services provided, security has become a key issue for the technology developers. This paper presents a prototype of a intrusion detection system for networks. There is often the need to update an installed Intrusion Detection System (IDS) due to new attack methods or upgraded computing environments.