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  • Book Overview & Buying Wireshark Essentials
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Wireshark Essentials

Wireshark Essentials

By : James H. Baxter
3.8 (5)
Buy this Book
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Wireshark Essentials

Wireshark Essentials

3.8 (5)
By: James H. Baxter
Buy this Book

Overview of this book

This book is aimed at IT professionals who want to develop or enhance their packet analysis skills. Basic familiarity with common network and application services terms and technologies is assumed; however, expertise in advanced networking topics or protocols is not required. Readers in any IT field can develop the analysis skills specifically needed to complement and support their respective areas of responsibility and interest.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Getting Acquainted with Wireshark
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1. Getting Acquainted with Wireshark
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Installing Wireshark
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Performing your first packet capture
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Summary
2
2. Networking for Packet Analysts
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2. Networking for Packet Analysts
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The OSI model – why it matters
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IP networks and subnets
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Switching and routing packets
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WAN links
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Wireless networking
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Summary
3
3. Capturing All the Right Packets
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3. Capturing All the Right Packets
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Picking the best capture point
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Test Access Ports and switch port mirroring
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Capturing interfaces, filters, and options
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Verifying a good capture
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Saving the bulk capture file
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Isolating conversations of interest
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Using the Conversations window
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Wireshark display filters
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Filter Expression Buttons
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Following TCP/UDP/SSL streams
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Marking and ignoring packets
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Saving the filtered traffic
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Summary
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4. Configuring Wireshark
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4. Configuring Wireshark
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Working with packet timestamps
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Colorization and coloring rules
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Wireshark preferences
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Wireshark profiles
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Summary
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5. Network Protocols
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5. Network Protocols
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The OSI and DARPA reference models
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Transport layer protocols
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Application layer protocols
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Summary
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6. Troubleshooting and Performance Analysis
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6. Troubleshooting and Performance Analysis
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Troubleshooting methodology
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Troubleshooting connectivity issues
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Troubleshooting functional issues
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Performance analysis methodology
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Summary
7
7. Packet Analysis for Security Tasks
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7. Packet Analysis for Security Tasks
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Security analysis methodology
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Security assessment tools
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Identifying unacceptable or suspicious traffic
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Scans and sweeps
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OS fingerprinting
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Malformed packets
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Phone home traffic
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Password-cracking traffic
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Unusual traffic
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Summary
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8. Command-line and Other Utilities
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8. Command-line and Other Utilities
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Wireshark command-line utilities
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Capturing traffic with Dumpcap
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Capturing traffic with Tshark
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Editing trace files with Editcap
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Merging trace files with Mergecap
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Other helpful tools
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Summary
9
Index
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Index

Switching and routing packets

So far, we've covered the topics required to discuss how packets of data get routed from computer A to host B across LANs and/or WANs over distances that may range from across a room to across the globe. The important concepts to remember are that Ethernet frames work with switches and IP packets work with routers to accomplish this feat, which we'll cover in the next section.

Ethernet frames and switches

To reiterate what was outlined in the layer 2 (the data-link layer) discussion, Ethernet frames are switched from the entry port to the appropriate destination port based on the destination MAC address. Network switches build tables of which MAC addresses belong to each port, compare a frame's destination MAC address to these tables, and switch the frame to the appropriate egress port if the destination is on the same switch or out a trunk port to another switch or router otherwise.

Note that the first time a switch sees a destination MAC address...

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