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, easy via complex filtering and switched LAN research. discover ways 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 resources for Advanced Network Analysis Techniques
Short-term trends can indicate the current network condition. Short-term trends are great to use when you need to know what is happening right now. For example, if someone calls you and states that the network is slow, you can grab a quick trend sample to see if you have a high bandwidth usage rate or broadcast rate right now. If your network traffic rate appears relatively low, you can focus in on problems with specific communication pairs. Remember that you are only looking at a snapshot of network communications.
But OSPF multicasts are better. Request - Request - Reply (Weird Problem) In this instance, a client’s requests are either being destroyed, routing to a dead end or timing out. This causes the client to retransmit the request as shown in Figure 1-23. The single reply indicates that the server side only received a single request. If this type of pattern shows up consistently on the network, you may want to trace the requests to see what happens to them. FIGURE 1-23. Hello.....? Where’s the packet going?
Although there are two versions of this protocol, the widely implemented version 1 only supports a window size of 1. In Figure 1-19 we know some data is being exchanged because the length field column indicates larger packets (now I didn’t say ‘large’ -- I said ‘larger’ -- remember that standard SPX has a maximum packet size of 576 bytes). Advanced Network Analysis Techniques - Chappell 30 Chapter 1: Statistics, Trends, Patterns and Timestamping FIGURE 1-19. SPX requires an acknowledgment after every data packet sent.
Advanced Network Analysis Techniques by Laura Chappell