Book Image

Learn Wireshark, - Second Edition

By : Lisa Bock
5 (1)
Book Image

Learn Wireshark, - Second Edition

5 (1)
By: Lisa Bock

Overview of this book

Wireshark is a popular and powerful packet analysis tool that helps network administrators investigate latency issues and potential attacks. Over the years, there have been many enhancements to Wireshark’s functionality. This book will guide you through essential features so you can capture, display, and filter data with ease. In addition to this, you’ll gain valuable tips on lesser-known configuration options, which will allow you to complete your analysis in an environment customized to suit your needs. This updated second edition of Learn Wireshark starts by outlining the benefits of traffic analysis. You’ll discover the process of installing Wireshark and become more familiar with the interface. Next, you’ll focus on the Internet Suite and then explore deep packet analysis of common protocols such as DNS, DHCP, HTTP, and ARP. The book also guides you through working with the expert system to detect network latency issues, create I/O and stream graphs, subset traffic, and save and export captures. Finally, you’ll understand how to share captures using CloudShark, a browser-based solution for analyzing packet captures. By the end of this Wireshark book, you’ll have the skills and hands-on experience you need to conduct deep packet analysis of common protocols and network troubleshooting as well as identify security issues.
Table of Contents (28 chapters)
1
Part 1 Traffic Capture Overview
6
Part 2 Getting Started with Wireshark
11
Part 3 The Internet Suite TCP/IP
16
Part 4 Deep Packet Analysis of Common Protocols
21
Part 5 Working with Packet Captures

Configuring firewall rules

ICMP supports IP to help ensure data delivery; however, it can also be used in malicious ways. For example, ICMP can be used to conduct reconnaissance as a precursor to an attack, or even to help evade firewall rules. In this section, we'll provide an example of how ICMP can be used to obtain information on the network or to redirect traffic. Then, we'll evaluate some of the firewall rules used to limit the effectiveness of an attack. 

Let's start with a brief discussion on a few attacks using ICMP.

Acting maliciously

ICMP can determine a great deal of information about a network. As a result, it can be used as an effective scanning tool. In addition, if security devices aren't tuned to disallow certain types of ICMP packets, you may be the victim of an attack, such as a Distributed Denial of Service (DDoS) or redirect attack.

First, let's start with an overview of a ping sweep, a technique used...