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Firewall Policies
and VP N
Configurations
Anne Henmi
Technical Editor
Mark Lucas
Abhishek Singh
Chris Cantrell
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Firewall Policies and VPN Configurations
Copyright © 2006 by Syngress Publishing,Inc.All rights reserved.Except as permitted under the
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Acknowledgments
Syngress would like to acknowledge the following people for their kindness and sup-
port in making this book possible.
Syngress books are now distributed in the United States and Canada by O’Reilly
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Stewart,Laura Schmier,Sue Willing,Mark Jacobsen,Betsy Waliszewski,Kathryn
Barrett,John Chodacki,Rob Bullington,Kerry Beck,Karen Montgomery,and Patrick
Dirden.
The incredibly hardworking team at Elsevier Science,including Jonathan Bunkell,Ian
Seager,Duncan Enright,David Burton,Rosanna Ramacciotti,Robert Fairbrother,
Miguel Sanchez,Klaus Beran,Emma Wyatt,Krista Leppiko,Marcel Koppes,Judy
Chappell,Radek Janousek,Rosie Moss,David Lockley,Nicola Haden,Bill Kennedy,
Martina Morris,Kai Wuerfl-Davidek,Christiane Leipersberger,Yvonne Grueneklee,
Nadia Balavoine,and Chris Reinders for making certain that our vision remains
worldwide in scope.
David Buckland,Marie Chieng,Lucy Chong,Leslie Lim,Audrey Gan,Pang Ai Hua,
Joseph Chan,June Lim,and Siti Zuraidah Ahmad of Pansing Distributors for the
enthusiasm with which they receive our books.
David Scott,Tricia Wilden, Marilla Burgess,Annette Scott,Andrew Swaffer, Stephen
O’Donoghue,Bec Lowe,Mark Langley,and Anyo Geddes of Woodslane for distributing
our books throughout Australia,New Zealand,Papua New Guinea,Fiji,Tonga,Solomon
Islands,and the Cook Islands.
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Technical Editor
Anne Henmi is an Information Security Engineer at Securify,Inc.
She works with development to contribute to the improvement of
the security posture of Securify’s products and services.
Her specialties include Linux,Secure Shell,public key technolo-
gies,penetration testing,and network security architectures.Anne’s
background includes positions as a Course Developer at Juniper
Networks,System Administrator at California Institute of
Technology,Principal Security Consultant at SSH Communications
Security,and as an Information Security Analyst at VeriSign,Inc.
Contributing Authors
Mark J. Lucas (MCSE and GIAC Certified Windows Security
Administrator) is a Senior System Administrator at the California
Institute of Technology.Mark is responsible for the design,imple-
mentation,and security of high availability systems such as Microsoft
Exchange servers,VMWare ESX hosted servers,and various
licensing servers.He is also responsible for the firewalls protecting
these systems.Mark has been in the IT industry for 10 years.This is
Mark’s first contribution to a Syngress publication.Mark lives in
Tujunga,California with his wife Beth,and the furry,four-legged
children,Aldo,Cali,Chuey,and Emma.
Chris Cantrell is a Presales System Engineer for Riverbed
Technology,the leading pioneer in the wide-area data services
(WDS) market.Before joining Riverbed,Chris spent 8 years
focusing on network security and intrusion prevention.He has held
various management and engineering positions with companies
such as Network Associates,OneSecure,NetScreen,and Juniper
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Networks.Chris was a contributing author for Configuring Netscreen
Firewalls (ISBN:1-93226-639-9),published by Syngress Publishing
in 2004.
Chris lives in Denver,Colorado with his loving and supportive
wife,Maria,and their two children,Dylan and Nikki.
Laura E. Hunter (CISSP,MCSE:Security,MCDBA,Microsoft
MVP) is an IT Project Leader and Systems Manager at the
University of Pennsylvania,where she provides network planning,
implementation,and troubleshooting services for various business
units and schools within the university.Her specialties include
Windows 2000 and 2003 Active Directory design and implementa-
tion,troubleshooting,and security topics.Laura has more than a
decade of experience with Windows computers;her previous expe-
rience includes a position as the Director of Computer Services for
the Salvation Army and as the LAN administrator for a medical
supply firm.She is a contributor to the TechTarget family of Web
sites,and to Redmond Magazine (formerly Microsoft Certified
Professional Magazine).
Laura has previously contributed to the Syngress Windows
Server 2003 MCSE/MCSA DVD Guide & Training System series
as a DVD presenter,author,and technical reviewer,and is the author
of the Active Directory Consultant’s Field Guide (ISBN:1-59059-492-
4) from APress.Laura is a three-time recipient of the prestigious
Microsoft MVP award in the area of Windows Server—
Networking.Laura graduated with honors from the University of
Pennsylvania and also works as a freelance writer,trainer,speaker,
and consultant.
Abhishek Singh works as a security researcher for Third Brigade,a
Canadian-based information security company.His responsibilities
include analysis,deep packet inspection,reverse engineering,writing
signatures for various protocols (DNS,DHCP,SMTP,POP,HTTP,
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and VOIP),Zero day attacks,Microsoft Tuesday critical,and vulner-
abilities.
In Information security,Abhishek likes to research intrusion
detection/prevention systems,firewalls,two factor authentication,
wireless security,cryptography,and virtual private networks.He has
an invention disclosure in firewalls and holds one patent in two
factor authentication.The patent involves secure authentication of a
user to a system and secure operation thereafter.In cryptography,he
has proposed an algorithm in learning theory which uses Context
Free Grammar for the generation of one-time authentication iden-
tity.One-time authentication identity generates one-time passwords,
disposable SSNs,and disposable credit card numbers.To prevent
high-bandwidth and malicious covert channels,he has proposed
enforcing semantic consistency in the unused header fields of
TCP/IP,UDP,and ICMP packets.Abhishek’s research findings in
the field of compiler,computer networks,mobile agents,and artifi-
cial neural networks have been published in primer conferences and
journals.
He holds a B.Tech.in Electrical Engineering from IIT-BHU,a
Master of Science in Computer Science and in Information
Security from the College of Computing Georgia Tech.While pur-
suing his education,he was employed with Symantec Corporation
as a Senior Software Engineer and has worked on a consulting pro-
ject for Cypress Communication,which won third prize at the 2004
Turn Around Management Competition.He was also employed
with VPN Dynamics and with Infovation Inc.
Presently he lives in Banglore with his lovely wife,Swati.
James McLoughlin (CISSP,CCSP,CCSE) is a security engineer
for Lan Communications,an Irish integrator/reseller.He is cur-
rently working towards achieving his CCIE in Security,and has over
a decade of experience in the security field.
James lives in Dublin,Ireland
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Susan Snedaker (MBA,BA,MCSE,MCT,CPM) is Principal
Consultant and founder of VirtualTeam Consulting,LLC (www.vir-
tualteam.com),a consulting firm specializing in business and tech-
nology consulting.The company works with companies of all sizes
to develop and implement strategic plans,operational improvements
and technology platforms that drive profitability and growth.Prior
to founding VirtualTeam in 2000,Susan held various executive and
technical positions with companies including Microsoft,Honeywell,
Keane,and Apta Software.As Director of Service Delivery for
Keane,she managed 1200+ technical support staff delivering phone
and email support for various Microsoft products including
Windows Server operating systems.She is author of How to Cheat at
IT Project Management (Syngress Publishing,ISBN:1-597490-37-7)
The Best Damn Windows Server 2003 Book Period (Syngress
Publishing,ISBN:1-931836-12-4) and How to Cheat at Managing
Windows Small Business Server 2003 (Syngress,ISBN:1-932266-80-
1).She has also written numerous technical chapters for a variety of
Syngress Publishing books on Microsoft Windows and security
technologies and has written and edited technical content for var-
ious publications.Susan has developed and delivered technical con-
tent from security to telephony,TCP/IP to WiFi,CIW to IT
project management and just about everything in between (she
admits a particular fondness for anything related to TCP/IP).
Susan holds a master’s degree in business administration and a
bachelor’s degree in management from the University of Phoenix.
She also holds a certificate in advanced project management from
Stanford University.She holds Microsoft Certified Systems Engineer
(MSCE) and Microsoft Certified Trainer (MCT) certifications.
Susan is a member of the Information Technology Association of
Southern Arizona (ITASA) and the Project Management Institute
(PMI).
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