Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort

Chapter 10. Intrusion Detection Tools

In the preceding chapter you learned the concepts of intrusion detection and intrusion response. Rarely are two attacks exactly the same, though the techniques used frequently rely on a common set of methods and result in many of the same symptoms, as described in the preceding chapter. It is through these common methods and symptoms that intrusion detection tools are able to assist the intrusion analyst with his job.

The intrusion analyst has much to choose from when looking for software tools to assist in problem correlation, diagnosis, and resolution. This chapter focuses on the software tools used in intrusion detection and tools that can help in any administrator's toolkit. The chapter begins with a look at network sniffers and continues through tools to check for rootkits and into filesystem checkers and log file monitoring.