Advanced Network Analysis Techniques by Laura Chappell

By Laura Chappell

As a follow-up identify to the "Introduction to community Analysis," this publication presents sound step by step directions on packet interpreting, uncomplicated via complex 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 midst of the evening.

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What about SAP or IPX RIP? Figure 1-11 shows the breakdown of the various protocols crossing this network. This is especially important when you want to know FIGURE 1-11. Yuck. Analyze it! What protocols are running on your network? Ideally, why don’t you check out this information over a week or so. Do you see any communications listed as ‘other’? These are typically communications that can’t be categorized as TCP/IP, IPX/SPX or AppleTalk. For example, Advanced Network Analysis Techniques - Chappell 17 Chapter 1: Statistics, Trends, Patterns and Timestamping Cisco’s CDP (Cisco Discovery Protocol) and the BPDU (Bridge Protocol Data Units) used by Spanning Tree may show up under this heading.

False Negatives False negatives occur when a problematic network condition exists, but no alarm is triggered. In this case, either the alarm thresholds are set incorrectly, or the analyzer can’t see or identify the problem. 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.

Analyze it! What protocols are running on your network? Ideally, why don’t you check out this information over a week or so. Do you see any communications listed as ‘other’? These are typically communications that can’t be categorized as TCP/IP, IPX/SPX or AppleTalk. For example, Advanced Network Analysis Techniques - Chappell 17 Chapter 1: Statistics, Trends, Patterns and Timestamping Cisco’s CDP (Cisco Discovery Protocol) and the BPDU (Bridge Protocol Data Units) used by Spanning Tree may show up under this heading.

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