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Mastering Wireshark
Mastering Wireshark

Mastering Wireshark: Analyze data network like a professional by mastering Wireshark - From 0 to 1337

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Mastering Wireshark

Chapter 2. Filtering Our Way in Wireshark

This chapter will talk about different filtering options available in Wireshark, namely, capture and display filters. We will also look at how to create and use different profiles. The following are the topics we will cover in this chapter:

  • An introduction to capture filters
  • Why and how to use capture filters
  • Lab up—capture filters
  • An introduction to display filters
  • Why and how to use display filters
  • Lab up—display filters
  • Colorizing traffic
  • Creating a new Wireshark profile(s)
  • Lab up—profiles

I hope you are ready to start analyzing packets using different filtering options present in Wireshark and to reuse the filters that we previously created in a user-defined profile. I will be guiding you with a technique to filter packets based on certain expressions, which we will create using different primitives that are available.

Before we go ahead and start creating awesome filters, I want to mention one more interesting tool that...

An introduction to filters

In the world of Wireshark, there are two kinds of filters that can be used over live traffic, and on saved capture files. Filters enhance the flexibility of packet analysis, where a certain user is given the privilege of seeing what he/she wants to see to capture what they want to capture.

The two types of filters are capture filter and display filter. Now, let's have look at each one of them in detail.

Capture filters

This gives you the facility to capture what you want to capture—others will be discarded. Capturing packets is a processor-intensive task, and Wireshark will acquire a quite good amount of primary memory as well. So, sometimes, we will have to save the resources for other processes, which can be utilized to analyze packets, and in some cases, we would like to capture only that data which meets our expression—rest of it will be dropped.

Wireshark offers some interesting options to configure an interface, which will be capturing traffic that meets only a certain expression, and this is achievable through the Capture Options window, as shown in the following screenshot:

Capture filters

Figure 2.1: The Capture Options dialog

Here, points list various capture options dialog related details

  • Capture: In this window, you can choose the interface you want to capture packets from, and you can even select multiple interfaces at once to listen on all of them. The details for every interface...

Display filters

Display filters are much more flexible and powerful when compared to capture filters. Display filters do not discard any packets; instead, the packets are hidden to make viewing convenient or convenience. Discarding packets is not a very effective practice because, once the packets are dropped, they cannot be recovered. When you apply the display filter, only those packets that meet the specification of your filter will be displayed. In the the second column of the status bar of the Wireshark window, you will see a number of packets displayed after you apply a filter.

A display filter can be used for a capture file in the Filter dialog box located above the Packet List Pane. Display filters are more popular than capture filters. The syntax used for display filters can be easily adapted and applied. For new users, a display filter is like a super power that gives you the functionality of hiding inappropriate packets in run-time that do not meet your requirements as per the...

Searching for packets using the Find dialog

If you want to find a packet for a particular criterion, you can use the Find dialog. It has a couple of useful search techniques that can be applied easily and effectively on an already captured file or on a live running capture. You can access the Find utility by navigating to Edit | Find packets or using the shortcut Ctrl + F.

Searching for packets using the Find dialog

Figure 2.15: The Find Packet dialog

Let's see some more configurable options in it:

  • The display filter: After capturing the traffic, while analyzing whether you just want to see some specific packets based on a certain IP /Port/ Protocol, those packets that meet a certain criteria will be displayed in the list pane, for example:
    • The ip.addr == 192.168.1.1 (based on an IP address)
    • The port 8080 (based on a port number)
    • http (based on a protocol)
  • The Hex value: If you have the hex value for a certain packet that you are looking for, then this option can be selected. Just write the physical address separated by colons, for...

Create new Wireshark profiles

Profiles in Wireshark are like customized environments, which can save a significant amount of time while auditing a network. A profile is a set of different components, such as capture filters, display filters, time preferences, column preferences, protocol preferences, color profiles, and so on, that fit together and give you a case-specific scenario, which you might require instantly.

Importing and exporting profiles is very easy in Wireshark, which is pretty useful while auditing a network where you don't have your preinstalled tools. Just copy and paste the Profile configuration files in a certain directory to use them. To create a profile, follow these steps:

  1. Right-click on the Profile column in Status Bar.
    Create new Wireshark profiles
  2. Click on New... in the pop-up dialog.
    Create new Wireshark profiles
  3. Now, choose any profile you wish to use as a template and type the name of the new profile.
    Create new Wireshark profiles
  4. And then, click on OK.

Now, in the status bar, you will see the the same profile has been activated. The changes that you...

An introduction to filters


In the world of Wireshark, there are two kinds of filters that can be used over live traffic, and on saved capture files. Filters enhance the flexibility of packet analysis, where a certain user is given the privilege of seeing what he/she wants to see to capture what they want to capture.

The two types of filters are capture filter and display filter. Now, let's have look at each one of them in detail.

Capture filters


This gives you the facility to capture what you want to capture—others will be discarded. Capturing packets is a processor-intensive task, and Wireshark will acquire a quite good amount of primary memory as well. So, sometimes, we will have to save the resources for other processes, which can be utilized to analyze packets, and in some cases, we would like to capture only that data which meets our expression—rest of it will be dropped.

Wireshark offers some interesting options to configure an interface, which will be capturing traffic that meets only a certain expression, and this is achievable through the Capture Options window, as shown in the following screenshot:

Figure 2.1: The Capture Options dialog

Here, points list various capture options dialog related details

  • Capture: In this window, you can choose the interface you want to capture packets from, and you can even select multiple interfaces at once to listen on all of them. The details for every interface are listed...

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Key benefits

  • Master Wireshark and train it as your network sniffer
  • Impress your peers and get yourself pronounced as a network doctor
  • Understand Wireshark and its numerous features with the aid of this fast-paced book packed with numerous screenshots, and become a pro at resolving network anomalies

Description

Wireshark is a popular and powerful tool used to analyze the amount of bits and bytes that are flowing through a network. Wireshark deals with the second to seventh layer of network protocols, and the analysis made is presented in a human readable form. Mastering Wireshark will help you raise your knowledge to an expert level. At the start of the book, you will be taught how to install Wireshark, and will be introduced to its interface so you understand all its functionalities. Moving forward, you will discover different ways to create and use capture and display filters. Halfway through the book, you’ll be mastering the features of Wireshark, analyzing different layers of the network protocol, looking for any anomalies. As you reach to the end of the book, you will be taught how to use Wireshark for network security analysis and configure it for troubleshooting purposes.

Who is this book for?

Are you curious to know what’s going on in a network? Do you get frustrated when you are unable to detect the cause of problems in your networks? This is where the book comes into play. Mastering Wireshark is for developers or network enthusiasts who are interested in understanding the internal workings of networks and have prior knowledge of using Wireshark, but are not aware about all of its functionalities.

What you will learn

  • Install Wireshark and understand its GUI and all the functionalities of it
  • Create and use different filters
  • Analyze different layers of network protocols and know the amount of packets that flow through the network
  • Decrypt encrypted wireless traffic
  • Use Wireshark as a diagnostic tool and also for network security analysis to keep track of malware
  • Troubleshoot all the network anomalies with help of Wireshark
  • Resolve latencies and bottleneck issues in the network

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 30, 2016
Length: 308 pages
Edition : 1st
Language : English
ISBN-13 : 9781783989539
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Product Details

Publication date : Mar 30, 2016
Length: 308 pages
Edition : 1st
Language : English
ISBN-13 : 9781783989539
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Table of Contents

10 Chapters
1. Welcome to the World of Packet Analysis with Wireshark Chevron down icon Chevron up icon
2. Filtering Our Way in Wireshark Chevron down icon Chevron up icon
3. Mastering the Advanced Features of Wireshark Chevron down icon Chevron up icon
4. Inspecting Application Layer Protocols Chevron down icon Chevron up icon
5. Analyzing Transport Layer Protocols Chevron down icon Chevron up icon
6. Analyzing Traffic in Thin Air Chevron down icon Chevron up icon
7. Network Security Analysis Chevron down icon Chevron up icon
8. Troubleshooting Chevron down icon Chevron up icon
9. Introduction to Wireshark v2 Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.5
(2 Ratings)
5 star 50%
4 star 0%
3 star 0%
2 star 50%
1 star 0%
Biswadip Goswami Jun 01, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very good knowledge base for technical know-how of a network monitoring tool. The content is according to the current trends with very detailed insight. A must buy for network security professionals. The author knows inside out of the technology discussed in the book. Hope to have more tools discussed by him in his upcoming books. Being a network engineer myself, I know the importance of knowing the tool discussed herein. Thank you Amazon.
Amazon Verified review Amazon
Peter G. Feb 27, 2017
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I had high expectations that this book would take me to the "next level" of knowledge on using Wireshark, but was quite disappointed that it barely covered the basics. Maybe I set the bar too high as I just finished an excellent pair of books: Troubleshooting with Wireshark and Wireshark Network Analysis, both by Laura Chappel. I also found the material a bit difficult to follow due to the overall poor grammar used by the author. I would not recommend this book as an advanced tutorial.
Amazon Verified review Amazon
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