By Laura Chappell
As a follow-up identify to the "Introduction to community Analysis," this e-book presents sound step by step directions on packet interpreting, easy via complicated filtering and switched LAN research. discover ways to construct filters to seize hackers coming via your firewall, decode 'unknown' protocols, and manage a set off that launches your analyzer in the midst of the evening.
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Extra info for Advanced Network Analysis Techniques
The matrix view of a network illustrates the many traffic patterns seen and helps you identify critical devices. Analyze it! Who are your top talkers? Do routers and servers show up as the most ‘popular’ devices on the network? Did broadcast show up as a popular destination? Be careful of analyzing a switched network -- see Appendix B, “Analyzing Switched Networks,” for more details. Advanced Network Analysis Techniques - Chappell 16 Chapter 1: Statistics, Trends, Patterns and Timestamping Protocols This is really a fun statistic to gather on a network.
Grin>. Imagine being able to set up a filter to catch anyone who might be running an FTP service regardless of the port that they established the service on. Wheeee! I have no idea who this guy is, but he sure looks happy, doesn’t he? Advanced Network Analysis Techniques - Chappell 42 Chapter 2: Capture and Display Filtering Filtering Overview Filters are used to reduce the number of packets to a manageable number that focus on the area you are most interested in. Figure 2-1 shows the basic flow of filtered data.
________________________________________________ Question 1-8: What type of communication pattern is often seen from database queries? ________________________________________________ Question 1-9: What is a false positive? How can you reduce false positives? ________________________________________________ Question 1-10: What is a false negative? How can you reduce false negatives? ________________________________________________ Advanced Network Analysis Techniques - Chappell 41 CHAPTER 2 Capture and Display Filtering In this chapter, we’ll examine the most exciting part of capturing packets -the filtering process.