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Wireshark® Network Analysis
The Official Wireshark Certified Network Analyst™ Study Guide
2
nd
Edition (Version 2.1b)
Laura Chappell
Founder, Chappell University™
Founder, Wireshark University™
Readers interested in this book may also be interested in the associated Wireshark Certified Network
Analyst
Official Exam Prep Guide – Second Edition.
10-digit ISBN: 1-893939-90-1
13-digit ISBN: 978-1-893939-90-5
Wireshark® Network Analysis
The Official Wireshark Certified Network Analyst™ Study Guide
2
nd
Edition (Version 2.1b)
Copyright 2012, Protocol Analysis Institute, Inc, dba Chappell University. All rights reserved. No part of this
ebook, or related materials, including interior design, cover design and contents of the referenced book
website,
www.wiresharkbook.com
, may be reproduced or transmitted in any form, by any means (electronic,
photocopying, recording or otherwise) without the prior written permission of the publisher.
To arrange bulk purchase discounts for sales promotions, events, training courses, or other purposes, please
contact Chappell University at the address listed on the next page.
Book URL:
www.wiresharkbook.com
Paperback Book 13-digit ISBN: 978-1-893939-94-3
Paperback Book 10-digit ISBN: 1-893939-94-4
Distributed worldwide for Chappell University through Protocol Analysis Institute, Inc.
For general information on Chappell University or Protocol Analysis Institute, Inc, including information on
corporate licenses, updates, future titles or courses, contact the Protocol Analysis Institute, Inc at 408/378-
7841 or send email to
info@chappellU.com
.
For authorization to photocopy items for corporate, personal or educational use, contact Protocol Analysis
Institute, Inc at email to
info@chappellU.com
.
Trademarks. All brand names and product names used in this book or mentioned in this course are trade
names, service marks, trademarks, or registered trademarks of their respective owners. Wireshark and the
"fin" logo are registered trademarks of the Wireshark Foundation. Protocol Analysis Institute, Inc is the
exclusive developer for Chappell University.
Limit of Liability/Disclaimer of Warranty. The author and publisher have used their best efforts in
preparing this book and the related materials used in this book. Protocol Analysis Institute, Inc, Chappell
University and the author(s) make no representations or warranties or merchantability or fitness for a
particular purpose. Protocol Analysis Institute, Inc and Chappell University assume no liability for any damages
caused by following instructions or using the techniques or tools listed in this book or related materials used in
this book. Protocol Analysis Institute, Inc, Chappell University and the author(s) make no representations or
warranties that extend beyond the descriptions contained in this paragraph. No warranty may be created or
extended by sales representatives or written sales materials. The accuracy or completeness of the information
provided herein and the opinions stated herein are not guaranteed or warranted to produce any particular
result and the advice and strategies contained herein may not be suitable for every individual. Protocol
Analysis Institute, Inc, Chappell University and author(s) shall not be liable for any loss of profit or any other
commercial damages, including without limitation special, incidental, consequential, or other damages.
Always ensure you have proper authorization before you listen to and capture network traffic.
Copy Protection. In all cases, reselling or duplication of this book and related materials used in this training
course without explicit written authorization is expressly forbidden. We will find you, ya know. So don’t steal it
or plagiarize this book.
This book and the book website,
www.wiresharkbook.com
, references Chanalyzer Pro software created by
MetaGeek (
www.metageek.net/wiresharkbook
).
This book and the book website,
www.wiresharkbook.com
, references GeoLite data created by MaxMind,
available from
www.maxmind.com
.
PhoneFactor™ SSL/TLS vulnerabilities documents and trace files referenced on the book website,
www.wiresharkbook.com
, were created by Steve Dispensa and Ray Marsh (
www.phonefactor.com
).
This book and the book website,
www.wiresharkbook.com
, references trace files from Mu Dynamics
(
www.pcapr.net
).
This book references rules released by Emerging Threats Copyright © 2003-2012, Emerging Threats. All rights
reserved. For more information, visit
emergingthreats.net
.
Protocol Analysis Institute, Inc.
5339 Prospect Road, # 343
San Jose, CA 95129 USA
www.wiresharkbook.com
Also refer to Chappell University at the same address
info@chappellU.com
www.chappellU.com
Cover: Fractal image,
Waves Envisioned during Late Nights at Work
, by Scott Spicer
Created with Apophysis 2.09
Dedication
This Second Edition is dedicated to Gerald Combs, creator of Wireshark (formerly Ethereal) and a good friend.
Twelve years ago, I sent Gerald a note—just out of the blue—"may I include Ethereal on my CD? I want to
give it away at conferences." Expecting some pushback—after all, he didn’t know who the heck I was—I was
amazed and thrilled to receive his response stating "sure, go ahead—that would be great!"
Gerald is more than the creator of Wireshark. Gerald is one of us. He struggled with a problem. He formulated
a solution. Then he did something extraordinary—he shared his solution with the world. In his typical unselfish
mode, Gerald opened up his project for the contribution and participation of others.
Ethereal morphed into Wireshark, and Wireshark continued to mature. Wireshark has surpassed every other
network analyzer product in the industry to become the de facto standard for network traffic analysis.
In 2011 Wireshark was voted the #1 Security Tool on the
SecTools.org
Top 125 Network Security Tools survey
(conducted by Gordon Lyons, creator of Nmap). This is a much deserved recognition that Wireshark and
packet analysis is a must-have skill for IT security professionals.
Throughout Wireshark’s rise in popularity, Gerald has remained one of the most honest, humble, dedicated
professionals in our field.
Thank you Gerald.
p.s. Again I want to express very special thanks to Gerald’s wife, Karen, and their absolutely cute-beyond-
belief, I-have-my-Daddy-wrapped-around-my-little-finger, smarty-pants-who-melts-your-heart daughter!
Gerald always beams when he talks about you two very special ladies and it is a treat spending time with you
both <girl power!>. I am grateful for the love, support and inspiration you have provided Gerald. Your
tremendous humor and joie de vivre inspires me!
ACKs
There are many people who were directly and indirectly involved in creating the First and Second Editions of
this book.
First and foremost, I would like to thank my children, Scott and Ginny, for your patience, support and humor
during the many hours I was huddled over my computer to complete this book. Your words of encouragement
really helped me balance work and life during some long days and nights of deadlines. It will be a treat to
write that "Cooking Badly" book with you someday!
Mom, Dad, Steve and Joe—ahh… yes, the "fam." You guys have given me so much humorous material for
my presentations! Can’t wait for "take your daughter to work day," Mom!
Special thanks to Brenda Cardinal and Jill Poulsen who have worked with me for over 10 years each—you
masochists! I am fortunate to have both of you around to brighten my days and put life in perspective.
To Colton Cardinal, who provided humorous distractions, smiles and, giggles—thanks for all the time staring
at the clocks during the past year and a half. I feel very fortunate to have the chance to watch you grow up!
Joy DeManty—I’m sure you’re sick of reading this book over and over and over again! I appreciate your keen
eye in reviewing this second edition. Let’s agree on this - no more 1,000 page books!
Lanell Allen—again you really pulled through for us on this project! Your tireless hours of work put into
finding my typos, half-sentences and dangling prepositions (he he) was invaluable. Thank you for taking on
this project.
Gerald Combs—what can I say? You have selflessly shared with us a tremendous tool and I am so very
grateful for your devotion to Wireshark. The first and second editions of this book are dedicated to you.
The Wireshark developers—what a group! It has been a pleasure meeting so many of you in person at the
Sharkfest conferences. Your continued efforts to improve and enhance Wireshark have helped so many IT
professionals find the root of network issues. Thank you for the many hours you have dedicated to making
Wireshark the world’s most popular network analyzer solution! You can find the developer list at Help |
About Wireshark | Authors. I hope this book accurately explains the features you have spent so many
hours implementing. If I missed anything you’d like included in future editions of this book, please let me
know.
Gordon "Fyodor" Lyon—the creation of the First Edition of this book was triggered when you released
"Nmap Network Scanning"—an excellent book that every networking person should own. I appreciate your
time and effort looking over the network scanning section. I look forward to working with you on some future
projects—there are so many possibilities!
Ryan Woodings and Mark Jensen of MetaGeek—it has been a pleasure collaborating with you folks on
ideas and microwave popping methods (g)! It has been a blast showing Wi-Spy/Chanalyzer Pro at conferences
and sharing these hot products with the IT community. I look forward to more brainstorming sessions. Special
thanks to Trent Cutler for reviewing the WLAN chapter and sending on some great feedback.
Steve Dispensa and Marsh Ray of PhoneFactor (
www.phonefactor.com
)—thank you both for kindly
allowing me to include your
Renegotiating TLS
document and trace files at
www.wiresharkbook.com
. You two
did a great job documenting this security issue and your work benefits us all.
Stig Bjørlykke, Wireshark Core Developer—you came up with so many great additions to the First Edition
of this book and recent versions of Wireshark! Your understanding of the inner workings of Wireshark as well
as the areas that often perplex people helped make this book much more valuable to the readers. We all
appreciate your development efforts to make Wireshark such a valuable tool!
Sean Walberg—Thanks for being such a great resource on the VoIP chapter. You really have such a
wonderful talent explaining the inner workings of VoIP communications. I loved your presentation at Sharkfest
—funny and geeky at the same time! I appreciate your efforts to clarify the VoIP chapter in this book.
Martin Mathieson, Wireshark Core Developer—I am so grateful for the fixes and tips you provided for
the VoIP chapter and the time you took to explain the duplicate IP address detection feature you added to
Wireshark. I appreciate you providing the RFC references to be included and understanding that the readers
may be new to VoIP analysis. The time and energy you have put into enhancing Wireshark are a benefit to us
all!
Jim Aragon—Thanks so much for your tremendous feedback on the First Edition of this book and providing
the tip on capturing traffic. It’s always great to read your ideas and suggestions and you’ve given me loads of
ideas for future tips and training.
Sake Blok, Wireshark Core Developer—Don’t you ever sleep? <g> Thanks for your feedback and
corrections on the First Edition of this book. It’s great having your case study,
The Tale of the Missing ARP
(in
Chapter 16: Analyze Address Resolution Protocol (ARP) Traffic
). I really appreciate the changes you made to
Wireshark regarding the "field not in use, but existent" issue. Yippie!
Ron Nutter—Hey, buddy! Hard to believe we’ve known each other for a zillion years, eh? Thanks for adding
the Cisco spanning instructions in this Second Edition. I know the readers will appreciate that you shared your
tips for setting up an efficient capture with Cisco equipment.
Jeff Carrell—You jumped right in to clean up my messy draft of IPv6 introductory materials. You did a great
job refocusing me to ‘show them the packets.’ No wonder people love your IPv6 classes! Thank so much for
helping out over the holidays. I know you were working away on the "Guide to TCP/IP" book and your time is
precious these days.
Betty DuBois—Thanks for all your review time and talent—not only on this book project, but also on the
Wireshark University Instructor-Led courses and the WCNA Exam. It’s always great to talk/work with a fellow
packet-geekess!
Keith Parsons—Thanks for clarifying the concepts in the WLAN chapter and adding the awesome "To
DS/From DS" graphic and table! You always have great ideas and teaching methods—and you’re truly the
"geek toy king" as well!
Anders Broman, Wireshark Core Developer—Thanks for taking the time to look through the VoIP chapter
and ensure the information was accurate and presented clearly. Thank you so much for all your efforts as a
Wireshark core developer and making so many of the changes I’ve whined about.
The pcapr Team—I appreciate you allowing me to provide readers with several trace files from your online
repository at
www.pcapr.net
. Thank you to Mu Dynamics (
www.mudynamics.com
) for supporting the
pcapr.net
project.
David Teng—Thanks for your thorough read through of the first edition and the numerous edits and
suggestions you provided. It is difficult to imagine the effort you put into translating this huge book to Chinese,
but I do hope to see it in print someday.
My Students—Sincere thanks to the hundreds of thousands of students who have taken my online
training courses, instructor-led courses and self-paced courses over 20 years of teaching. I’ve gotten to know
so many of you as friends. Your honest and direct feedback has always helped me hone my training materials
(and my jokes).
Gary Lewis—you wild guy, you! If anyone out there needs graphic design services, Gary is the "go to" guy
with a great (and somewhat twisted) sense of humor. Thanks for a great cover design on the First Edition—
and a lovely rework of the Second Edition!
Case Study/Tip Submitters—Case studies were submitted from all around the world. Thanks to all of you
who overloaded my email with your Wireshark success stories. The following individuals provided case studies
that were included in this book to offer a glimpse into how folks use Wireshark to save time and money.
LabNuke99 - P.C. - Jim Aragon - Roy B. - Martin B. - Bill Back - Sake Blok - Jeff Carrell - Coleen D. - Todd
DeBoard and Team - Mitch Dickey - Thanassis Diogos - Steve Dispensa - Todd Dokey - Vik Evans - Russ F. -
Allen Gittelson - Richard Hicks - Rob Hulsebos - Mark Jensen - Jennifer Keels - Christian Kreide - Todd Lerdal -
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