By Laura Chappell

As a follow-up identify to the "Introduction to community Analysis," this ebook presents sound step by step directions on packet interpreting, uncomplicated via complex filtering and switched LAN research. learn how to construct filters to catch hackers coming via your firewall, decode 'unknown' protocols, and organize a set off that launches your analyzer in the midst of the evening.

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FIGURE 1-12. Alarm report log. Advanced Network Analysis Techniques - Chappell 19 Chapter 1: Statistics, Trends, Patterns and Timestamping As you can see, the network I’m on right now isn’t too healthy. Yipes -- 98% utilization? Tons of broadcasts!? This is a really bad day on the network. Of course this is a simple scenario -- it’s easy to see what the problem is. The next step is to find the source of the broadcasts, the type of broadcasts and reason for the broadcasts. Watch the Default Alarm Settings How are the default alarm settings determined?

Advanced Network Analysis Techniques - Chappell 35 Chapter 1: Statistics, Trends, Patterns and Timestamping Timestamping Analyzers timestamp each packet captured. They typically include the timestamp information on the decode screen, as shown in Figure 1-24. FIGURE 1-24. Most analyzers support three basic timestamps. There are three basic timestamps used in analysis: • Relative (“A” in Figure 1-26) • • Delta (aka “Interpacket”) (“B” in Figure 1-26) Absolute (“C” in Figure 1-26) All three are useful for a variety of purposes.

Figure 1-12 shows the alarm report log from my system. FIGURE 1-12. Alarm report log. Advanced Network Analysis Techniques - Chappell 19 Chapter 1: Statistics, Trends, Patterns and Timestamping As you can see, the network I’m on right now isn’t too healthy. Yipes -- 98% utilization? Tons of broadcasts!? This is a really bad day on the network. Of course this is a simple scenario -- it’s easy to see what the problem is. The next step is to find the source of the broadcasts, the type of broadcasts and reason for the broadcasts.

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