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Network Analysis using Wireshark Cookbook
Network Analysis using Wireshark Cookbook

Network Analysis using Wireshark Cookbook: This book will be a massive ally in troubleshooting your network using Wireshark, the world's most popular analyzer. Over 100 practical recipes provide a focus on real-life situations, helping you resolve your own individual issues.

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Network Analysis using Wireshark Cookbook

Chapter 2. Using Capture Filters

In this chapter, we will cover the following topics:

  • Configuring capture filters
  • Configuring Ethernet filters
  • Configuring hosts and networks filters
  • Configuring TCP/UDP and port filters
  • Configuring compound filters
  • Configuring byte-offset and payload matching filters

Introduction

In the first chapter we talked about how to install Wireshark, how to configure it for basic operations, and where to locate it in the network. In this chapter and the next one we will talk about capture filters (Chapter 2, Using Capture Filters) and display filters (Chapter 3, Using Display Filters).

It is important to distinguish between these two types of filters:

  • Capture filters are configured before we start to capture data, so only data that is approved with the filters will be captured. All other data will be lost. These filters are described in this chapter.
  • Display filters are filters that filter data after it has been captured. In this case, all data is captured, and you configure what data you wish to display. These filters are described in Chapter 3, Using Display Filters.

Tip

Capture filters are based on the tcpdump syntax presented in the libpcap/WinPcap library, while the display filters syntax was presented some years later. Therefore, keep in mind that the display...

Configuring capture filters

We recommend that before configuring a capture filter, you will carefully design what you want to capture, and prepare your filter for this. Don't forget—what doesn't pass the filter, will be lost.

There are some Wireshark predefined filters that you can use, or you can configure it yourself as described in the next recipe.

Getting ready

For configuring capture filters, open Wireshark, and follow the steps in the recipe.

How to do it...

For configuring capture filters before starting with the capture, go through the following steps:

  1. For configuring a capture filter, click on the Show the capture options… button, second from the left, as shown in the following screenshot:
    How to do it...
  2. The Wireshark: Capture Options window will open as you see in the following screenshot:
    How to do it...
  3. Double-click on the interface on which you want to configure the capture filter (you can verify which interface is the active one, as described in Chapter 1, Introducing Wireshark).
  4. The Edit...

Configuring Ethernet filters

When talking about Ethernet filters, we refer to Layer-2 filters that are MAC address-based filters. In this recipe we will refer to these filters and what we can do with them.

Getting ready

The basic Layer 2 filters are:

  • ether host <Ethernet host>: To get the Ethernet address
  • ether dst <Ethernet host>: To get the Ethernet destination address
  • ether src <Ethernet host>: To get the Ethernet source address
  • ether broadcast: To capture all Ethernet broadcast packets
  • ether multicast: To capture all Ethernet multicast packets
  • ether proto <protocol>: To filter only the protocol type indicated in the protocol identifier
  • vlan <vlan_id>: To pass only packets from a specific VLAN that is indicated in the identifier field

For negating a filter rule, simply type the word not or ! in front of the primitive. For example:

Not ether host <Ethernet host> or ! Ether host <Ethernet host> will capture packets that are not from/to the Ethernet address...

Configuring host and network filters

When talking about host and network filters, we refer to Layer 3 filters that are IP address-based filters. In this recipe we will refer to these filters and what we can do with them.

Getting ready

The basic Layer 3 filters are:

  • ip or ip6: To capture IP or IPv6 packets.
  • host <host>: To get host name or address.
  • dst host <host>: To get destination host name or address.
  • src host <host>: To get source host name or address.

    Tip

    Host can be an IP address or a host name related with this number. You can type, for example, a filter host www.packtpub.com that will show you all packets to/from the IP address related to the Packt website.

  • gateway <Host name or address>: It captures traffic to or from the hardware address but not to the IP address of the host. This filter captures traffic going through the specified router. This filter requires a host name that is used and can be found by the local system's name resolution process (for example...

Configuring TCP/UDP and port filters

In this recipe we will present Layer 4 TCP/UDP port filters and how we can use them with capture filters.

Getting ready

The basic Layer 4 filters are:

  • port <port>: When the packet is a Layer 4 protocol, such as TCP or UDP, this filter will capture packets to/from the port indicated in the identifier field
  • dst port <port>: When the packet is a Layer 4 protocol, such as TCP or UDP, this filter will capture packets to the destination port indicated in the identifier field
  • src port <port>: When the packet is a Layer 4 protocol, such as TCP or UDP, this filter will capture packets to the source port indicated in the identifier field

The port-range matching filters are:

  • tcp portrange <p1>-<p2> or udp portrange <p1>-<p2>: TCP or UDP packets in the port range of p1 to p2
  • tcp src portrange <p1>-<p2> or udp src portrange <p1>-<p2>: TCP or UDP packets in the source port range of p1 to p2
  • tcp dst portrange...

Introduction


In the first chapter we talked about how to install Wireshark, how to configure it for basic operations, and where to locate it in the network. In this chapter and the next one we will talk about capture filters (Chapter 2, Using Capture Filters) and display filters (Chapter 3, Using Display Filters).

It is important to distinguish between these two types of filters:

  • Capture filters are configured before we start to capture data, so only data that is approved with the filters will be captured. All other data will be lost. These filters are described in this chapter.

  • Display filters are filters that filter data after it has been captured. In this case, all data is captured, and you configure what data you wish to display. These filters are described in Chapter 3, Using Display Filters.

Tip

Capture filters are based on the tcpdump syntax presented in the libpcap/WinPcap library, while the display filters syntax was presented some years later. Therefore, keep in mind that the display...

Configuring capture filters


We recommend that before configuring a capture filter, you will carefully design what you want to capture, and prepare your filter for this. Don't forget—what doesn't pass the filter, will be lost.

There are some Wireshark predefined filters that you can use, or you can configure it yourself as described in the next recipe.

Getting ready

For configuring capture filters, open Wireshark, and follow the steps in the recipe.

How to do it...

For configuring capture filters before starting with the capture, go through the following steps:

  1. For configuring a capture filter, click on the Show the capture options… button, second from the left, as shown in the following screenshot:

  2. The Wireshark: Capture Options window will open as you see in the following screenshot:

  3. Double-click on the interface on which you want to configure the capture filter (you can verify which interface is the active one, as described in Chapter 1, Introducing Wireshark).

  4. The Edit Interface Settings window...

Left arrow icon Right arrow icon

Key benefits

  • Place Wireshark in the network and configure it for effective network analysis
  • Use Wireshark's powerful statistical tools and expert system for pinpointing network problems
  • Use Wireshark for troubleshooting network performance, applications, and security problems in the network

Description

Is your network slow? Are your users complaining? Disconnections? IP Telephony problems? Video freezes? Network analysis is the process of isolating these problems and fixing them, and Wireshark has long been the most popular network analyzer for achieving this goal. Based on hundreds of solved cases, Network Analysis using Wireshark Cookbook provides you with practical recipes for effective Wireshark network analysis to analyze and troubleshoot your network. "Network analysis using Wireshark Cookbook" highlights the operations of Wireshark as a network analyzer tool. This book provides you with a set of practical recipes to help you solve any problems in your network using a step-by-step approach. "Network analysis using Wireshark Cookbook" starts by discussing the capabilities of Wireshark, such as the statistical tools and the expert system, capture and display filters, and how to use them. The book then guides you through the details of the main networking protocols, that is, Ethernet, LAN switching, and TCP/IP, and then discusses the details of application protocols and their behavior over the network. Among the application protocols that are discussed in the book are standard Internet protocols like HTTP, mail protocols, FTP, and DNS, along with the behavior of databases, terminal server clients, Citrix, and other applications that are common in the IT environment. In a bottom-up troubleshooting approach, the book goes up through the layers of the OSI reference model explaining how to resolve networking problems. The book starts from Ethernet and LAN switching, through IP, and then on to TCP/UDP with a focus on TCP performance problems. It also focuses on WLAN security. Then, we go through application behavior issues including HTTP, mail, DNS, and other common protocols. The book finishes with a look at network forensics and how to search and find security problems that might harm the network.

Who is this book for?

This book is aimed at research and development professionals, engineering and technical support, and IT and communications managers who are using Wireshark for network analysis and troubleshooting. This book requires a basic understanding of networking concepts, but does not require specific and detailed technical knowledge of protocols or vendor implementations.

What you will learn

  • Configure Wireshark for effective network troubleshooting
  • Set up various display and capture filters
  • Use basic statistical tools that provide you with "who is talking" tables, conversations, and HTTP statistics
  • Master both the standard and advanced features of IO graphs
  • Use the expert system to pinpoint various types of events that might influence the behavior of your network
  • Learn about Wi-Fi testing and how to resolve problems related to wireless LANs
  • Explore performance issues in TCP/IP
  • Explore failures due to delays and jitters in the network
  • Find and resolve problems due to bandwidth, throughput, and packet loss
  • Identify and locate faults in communication applications including HTTP, FTP, mail, and various other applications ‚Äì Microsoft OS problems, databases, voice, and video over IP
  • Identify and locate faults in detecting security failures and security breaches in the network

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 24, 2013
Length: 452 pages
Edition : 1st
Language : English
ISBN-13 : 9781849517645
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Product Details

Publication date : Dec 24, 2013
Length: 452 pages
Edition : 1st
Language : English
ISBN-13 : 9781849517645
Tools :

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Table of Contents

16 Chapters
1. Introducing Wireshark Chevron down icon Chevron up icon
2. Using Capture Filters Chevron down icon Chevron up icon
3. Using Display Filters Chevron down icon Chevron up icon
4. Using Basic Statistics Tools Chevron down icon Chevron up icon
5. Using Advanced Statistics Tools Chevron down icon Chevron up icon
6. Using the Expert Infos Window Chevron down icon Chevron up icon
7. Ethernet, LAN Switching, and Wireless LAN Chevron down icon Chevron up icon
8. ARP and IP Analysis Chevron down icon Chevron up icon
9. UDP/TCP Analysis Chevron down icon Chevron up icon
10. HTTP and DNS Chevron down icon Chevron up icon
11. Analyzing Enterprise Applications' Behavior Chevron down icon Chevron up icon
12. SIP, Multimedia, and IP Telephony Chevron down icon Chevron up icon
13. Troubleshooting Bandwidth and Delay Problems Chevron down icon Chevron up icon
14. Understanding Network Security Chevron down icon Chevron up icon
A. Links, Tools, and Reading Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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Rating distribution
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(7 Ratings)
5 star 57.1%
4 star 42.9%
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jack Mar 21, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is definitely a great book to dive in the Wireshark world. It is a good reference for who uses Wireshark for the first time and at the same time it is a good cookbook book for network administrators who often uses the packet analyzer.The book starts of with a general introduction to the traffic analysis and Wireshark in general. The next two section introduce the reader to BPF and display filter, and offer a wide set of practical examples. Then the book dives in the analysis tools in Wireshark and describes what they do and how they work. Once the reader had built up enough knowledge on the different tools, the book goes trough the different stack layers illustrating how to put together filters and tools to solve common network issues on the different layers.One of nice things about this book is that it's self contained, you can read this book without having to look around for other network reference (e.g. protocol headers, SSL handshake, HTTP status code). It's nice to have everything in the same place, especially when you are dealing with the tons of standards and acronyms of the networking world.I enjoyed reading this book and I highly recommended it both to people that are approaching Wireshark for the first time and for people that work with networks and are looking for a great and practical cookbook.
Amazon Verified review Amazon
Chen Heffer Feb 03, 2014
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This important book manage to collaborate all relevant network aspects of both IT and IS in one book.It covers all topics with a comprehensive and deep analysis of the various scenarios. It doesn’t leave you with a question mark, it covers all aspects in every topic it touches.It is written in a methodology that goes from the bottom up. It takes you through the basic information and slowly goes up the scale and build up your knowledge.It doesn't stop in providing the information, it gets you to actually practice what you learned and takes the theory to a hands-on experience. It simply takes you by the hand in gaining the knowledge you need just like if you sit in a class, make your notes and go through actual training practice. It is very rare to get this kind of feeling from technical books.The book is written in a simple language that both professionals and non-professionals can understand and relate to.The material is very well up to date with the latest technical terms and development in the network market.To summarize, this is a very important book for technical network people, IT in general and surprisingly also regulatory and compliance people. It leaves you with the just the right amount of information you need in order to know what the regulations and standards out there talk about, and it makes your technical brain cells work and gives you the appetite to go out there and practice what you just read.
Amazon Verified review Amazon
stefano antoni Mar 13, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book, in my opinion, is meant for those who wish to enrich their knowledge on wireshark regardless of their current level.The structure of the recipes and the chapters, the widespread use of print screens, the references to web pages which enrich the knowledge of a specific subject, help both the reader without knowledge on wireshark, but also those who have a good knowledge of the instrument .I found it very useful the references to specific cases of actual problems cause they gave me the chance to see not only the use of Wireshark and its instruments, but I also showed me an analytical approach to troubleshooting and very useful in this context the presence of links to sites where you can download analysis programs.After reading this book I most certainly ideas clear on how to carry out the analysis of the problems that I face often at work
Amazon Verified review Amazon
Ricky Dodge Apr 28, 2016
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Great
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W Boudville Feb 23, 2014
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Orzach offers you a nice detailed book of recipes dealing with many practical network issues. Where the network can be wired or wireless. For the latter, the book deals with WiFi networks which in practice for many of us are the most common form of Internet wireless networks anyway.Wireshark handles much of the tedious low level stuff. Like mapping from a hostname to the underlying IP address and capturing packets that have this address in their source or destination fields. The chapter on Layer 2 filters is as low level as you can get. Note importantly that Wireshark can analyse traffic on both IPv4 and v6 networks. IPv6 is finally starting to become common and Wireshark is already there, with extensive functionality.The book and Wireshark together free you from having to know the detailed formatting of a v4 or v6 packet. The book goes straight into the recipes without bogging you down in many diagrams of the packet formats. The latter is more typical of earlier texts on IP and TCP where there was no software like Wireshark. Back then, such knowledge of formatting was needed by the reader because it was up to you to essentially write a rudimentary version of Wireshark.The book walks up the protocol stack, starting with Layer 2. For example, a later chapter has recipes on http and DNS. So just like the early chapter on Layer 2, you can focus on the issues of analysis and problem solving without having to know low level details.
Amazon Verified review Amazon
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