Network Intrusion Detection Techniques and Open Source Tools

Today most of the human activities required the aid of computer network and internet services such as in banking, health, marketing, research etc. These systems are required to be monitored and protected from any intrusion attack in order to provide consistent and secure services to the users. To protect the confidentiality, Integrity and the availability (CIA) of network/internet based services/systems; Intrusion Detection Systems (IDS) are designed. There are various commercial as well as open source IDS tools are available with its own strength & weakness. This paper provides the general discussion and various features and comparison of the available open source IDS tools such as snort and bro.