By Laura Chappell
As a follow-up name to the "Introduction to community Analysis," this e-book offers sound step by step directions on packet deciphering, easy via complex filtering and switched LAN research. learn how to construct filters to trap hackers coming via your firewall, decode 'unknown' protocols, and organize a set off that launches your analyzer in the course of the evening.
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Extra info for Advanced Network Analysis Techniques
Com. Now let’s look a bit more closely at those summary screens and the packet timestamping mechanisms. 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.
For example, you could set a capture filter to gather all broadcast traffic. To capture your broadcast traffic, you would build a filter that looks for all packets addressed to MAC address 0xFF-FF-FF-FF-FF-FF (the broadcast MAC address). FF), the IP broadcast address. 255, as well. Since capture filters are applied at the time that packets are arriving at the analyzer, they do require some CPU cycles. If the analyzer is already dropping packets because of a high network load, it may drop even more packets when you apply a capture filter.
Take a look at your broadcast traffic -- find a typical route broadcast (IPX RIP, IP RIP, OSPF, NLSP, whatever). Now -- use the timestamp information to determine the frequency of those broadcasts. Be certain you are looking at the packets the protocol uses to inform other routers about known routes or route entries. What is the frequency? ” Advanced Network Analysis Techniques - Chappell 39 Chapter 1: Statistics, Trends, Patterns and Timestamping Chapter Quiz Spend a few moments reviewing this quiz.
Advanced Network Analysis Techniques by Laura Chappell