Advanced Network Analysis Techniques by Laura Chappell

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, easy via complicated filtering and switched LAN research. discover ways to construct filters to trap hackers coming via your firewall, decode 'unknown' protocols, and manage a set off that launches your analyzer in the course of the evening.

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________________________________________________ Question 1-2: Your broadcast alarm has been triggered again and again over the night. Since it’s sending messages to Joe, you really aren’t that put out, however, Joe is certainly a cranky little brat the following morning. What can you do to reduce the broadcast alarms? ________________________________________________ Question 1-3: What devices need to process packets addressed to 0xFF-FF-FF-FF-FF-FF? What devices need to process packets sent to a multicast address?

In other words, short-term trends give you the current ‘mood’ of the network -- they do not define the personality. For that, you need to examine your long-term trends. In some instances, analyzers don’t differentiate between short-term and long-term trends. Sniffer is one of those analyzers. As you’ll notice in the next section, long-term trends are gathered by simply keeping the history windows open over days and weeks. You might want to increase the sampling rate or consider buying a bigger hard drive and a few reams of paper for the charts!

False negatives Advanced Network Analysis Techniques - Chappell 21 Chapter 1: Statistics, Trends, Patterns and Timestamping give you a sense of security and happiness -- doom lurks around the corner. Sometimes, you can build advanced filters (as depicted in Chapter 2, “Capture and Display Filtering) to help identify these problem situations. In other situations, you may need to perform periodic checks of your network traffic to identify any unusual patterns or behaviors. If you do find an area that should be tracked by the analyzers, let the manufacturers know.

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