Network Troubleshooting with Wireshark Training Course

Last updated

Course Code

wireshark

Duration

21 hours (usually 3 days including breaks)

Requirements

  • An understanding of TCP/IP networking principles

Overview

Network packet analysis is a technique used to view, in real time, the raw data sent and received over a network interface. This is useful for troubleshooting network configuration and network application problems. Wireshark is a free open source packet analyzer used for troubleshooting such network issues.

In this instructor-led, live training, participants will learn how to use Wireshark to troubleshoot the functionality of a network as well as the performance of differente networked applications. Participants will learn network troubleshooting principles and practice techniques for capturing and analyzing TCP/IP request and response traffic between different clients and the servers.

By the end of this training, participants will be able to:

  • Analyze network functionality and performance in various environments under different conditions
  • Determine whether instances of different server applications are performing acceptably
  • Identify the primary sources of network performance problems
  • Identify and troubleshoot the most common causes of performance problems in TCP/IP communications

Audience

  • Network engineers
  • Network and computer technicians

Format of the Course

  • Part lecture, part discussion, exercises and heavy hands-on practice

Note

  • To request a customized training for this course, please contact us to arrange.

Course Outline

Introduction

  • Wireshark -- not just a last-resort tool

Overview of Network Troubleshooting Concepts

  • Root cause analysis

Installing Wireshark

Overview of Wireshark Features

  • Navigating the UI interface

Capturing Traffic in the Test Environment

  • Selecting the network interface
  • Capture packets on wired and wireless networks

Analyzing the Logs

  • Inspecting the HTTP packets
  • Viewing back-and-forth TCP streams
  • Saving the log for offline inspection

Analyzing Connection Speed Issues When Connecting to a Particular Website

  • Using filters
  • Seeing the statistics

Analyzing by Traffic Type

  • DNS, ARP, IPv4, IPv6, ICMP, UDP, TCP, and HTTP/HTTPS
  • Consistently slow connections over prolonged periods of time

Checking Response Times

  • Setting delta time columns

Checking for Machines Infected with a Virus

  • Inspecting ARP traffic

Inspecting Sources of Network Traffic

  • Intel ANS probe
  • Broken/misconfigured software (network flooding)

Pinpointing Performance Issues

  • Creating statistical charts and graphs
  • Setting colors in Wireshark
  • Filtering traffic
  • Using Wireshark Expert System and TCP/IP Resolution Flowchart

Troubleshooting Connections within a Secured Network Environment

  • Proxies, firewalls and clients

Configuring Wireshark for Optimal Performance

  •  Non-intrusive analysis

Troubleshooting

Summary and Conclusion

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