使用Wireshark解决实战网络问题：实用报文分析

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"《实战数据包分析：利用Wireshark解决实际网络问题》是一本由Chris Sanders编写的关于网络分析的书籍，旨在教授读者如何使用Wireshark工具解决实际遇到的网络问题。" 《实战数据包分析：利用Wireshark解决实际网络问题》这本书深入浅出地介绍了Wireshark这款强大的网络协议分析工具。Wireshark是网络故障排查、性能优化、安全审计等领域的必备利器，它能捕获并解析网络数据包，帮助用户理解网络通信的细节。书中的内容主要围绕以下几个知识点展开： 1. **Wireshark基础**：首先，读者将了解Wireshark的基本界面和功能，包括如何启动和配置Wireshark，以及如何过滤和浏览捕获的数据包。 2. **网络协议基础**：书中涵盖了TCP/IP协议栈的主要协议，如Ethernet、IP、TCP、UDP、DNS等，解释了它们的工作原理和常见字段含义，使读者能理解数据包的结构和意义。 3. **数据包分析技巧**：作者详细讲解了如何使用Wireshark进行深度数据包分析，包括跟踪TCP流、分析HTTP交互、查找网络延迟原因等实用技能。 4. **网络安全**：书中涉及了网络安全方面的内容，如识别和分析潜在的网络攻击，如嗅探、中间人攻击、SQL注入等，并介绍如何利用Wireshark进行防护。 5. **故障诊断**：通过实例，读者将学习如何利用Wireshark诊断网络连接问题，例如丢包、拥塞、路由问题等，并提供解决方案。 6. **实战应用**：书中包含了一系列的实际案例，如解决邮件系统问题、优化VoIP通信、调试应用程序网络行为等，帮助读者将理论知识应用到实际工作中。 7. **高级话题**：对于有经验的读者，书中还讨论了更高级的主题，如使用Wireshark进行性能调优、编写自定义捕获过滤器和显示过滤器，以及与其他网络分析工具的集成。 8. **技术审阅**：值得一提的是，本书的技术审阅人为Gerald Combs，他是Wireshark项目的创始人，确保了内容的专业性和准确性。通过阅读这本书，无论是网络管理员、开发人员还是对网络感兴趣的个人，都能提升自己的网络分析能力，有效解决实际工作中的网络问题。书中的实例和练习提供了丰富的实践机会，让读者在动手操作中加深理解，真正掌握Wireshark的使用。

xiv Contents in Detail

A Bad Connection Attempt .................................................................................... 148

What We Know ..................................................................................... 148

Tapping into the Wire

Air ........................................................................ 148

Analysis ................................................................................................. 148

Summary ................................................................................................ 150

Final Thoughts ...................................................................................................... 150

FURTHER READING 151

AFTERWORD 154

INDEX 155

xviii Introduction

The great thing about packet analysis is that it has become an increasingly

popular method of solving problems and learning more about networks.

Thanks to the advent of user groups, wikis, and blogs, the techniques

covered in this book are becoming prerequisite knowledge for some jobs.

Packet analysis is a requirement for managing today’s networks, and this

book will give you the jump start you need in learning how it all works.

Why This Book?

You may find yourself wondering why you should buy this book as opposed

to any other book about packet analysis. The answer lies right in the title:

Practical Packet Analysis. Let’s face it—nothing beats real-world experience,

and the closest you can come to that experience in a book is through practical

examples of packet analysis with real-world case scenarios. The first half of

this book gives you the prerequisite knowledge you will need to understand

packet analysis and Wireshark. The second half of the book is devoted

entirely to practical case scenarios that you could easily encounter in day-

to-day network management.

Whether you are a network technician, a network administrator, a chief

information officer, a desktop technician, or simply a help desk worker, you

have a lot to gain from understanding and using packet analysis techniques.

Concepts and Approach

I am generally a really laid-back guy, so I when I teach a concept, I try to do so

in a really laid-back way. This holds true for the language used in this book.

It is very easy to get lost in technical jargon when dealing with a technical

concept, but I have tried my best to keep things as casual as possible. I’ll

make all definitions clear, straightforward, and to the point, without any

added fluff.

If you really want to learn packet analysis, you should make it a point

to master the concepts in the first several chapters—they are integral to

understanding the rest of the book. The second half of the book is purely

conceptual. You may not see these exact scenarios in your work, but you

should be able to apply the concepts you learn from them in the situations

you do encounter.

Here is a quick breakdown of the chapters of this book.

Chapter 1: Packet Analysis and Network Basics

What is packet analysis? How does it work? How do you do it? This chap-

ter covers the very basics of network communication and packet analysis.

Chapter 2: Tapping into the Wire

This chapter covers the different techniques you can use to place a packet

sniffer on your network.

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