By Laura Chappell
As a follow-up name to the "Introduction to community Analysis," this booklet 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 arrange a set off that launches your analyzer in the course of the evening.
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Extra resources for Advanced Network Analysis Techniques
How does your packet size distribution look? What could be the cause of those smaller packets? In Chapter 3 you learn to perform application analysis. Remember to look at the typical packet size used to download data within an application -- this statistic says much for the general ‘drag’ of an application on the network. You will probably find that database applications use lots of smaller packets (especially when they read out-of-sequence data in a file) whereas file transfer applications read data with larger packets (hopefully).
If most of the traffic is for command sequences, then I would not be surprised to see smaller packet sizes. If, however, most of the traffic is file transfer traffic, then I’d figure we have pretty inefficient network. What can you do about small packet sizes? Well... you can look at the type of application that you’re using for transferring packets. You can also look at the protocol being used to transfer data. For example, SPX is a protocol that uses minimum sized packets by default. Packets can also be fragmented if there’s any sort of small MTU (maximum transmission unit) network along their path.
For example, Figure 1-26 shows a latency test used to compare an application’s performance on the local network compared to the performance across the WAN. Advanced Network Analysis Techniques - Chappell 37 Chapter 1: Statistics, Trends, Patterns and Timestamping Look at the delta time between requests and replies and multiply that by the number of request/reply sets to figure out how long it may take to load an application or perform a task. FIGURE 1-26. Absolute Timestamps Absolute timestamps indicate the time the packet arrived based on the clock of the analyzer system.