Firewall Fundamentals
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Firewall Fundamentals

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The essential guide to understanding and using firewalls to protect personal computers and your network An easy-to-read introduction to the most commonly deployed network security device Understand the threats firewalls are designed to protect against Learn basic firewall architectures, practical deployment scenarios, and common management and troubleshooting tasks Includes configuration, deployment, and management checklistsIncreasing reliance on the Internet in both work and home environments has radically increased the vulnerability of computing systems to attack from a wide variety of threats. Firewall technology continues to be the most prevalent form of protection against existing and new threats to computers and networks. A full understanding of what firewalls can do, how they can be deployed to maximum effect, and the differences among firewall types can make the difference between continued network integrity and complete network or computer failure. Firewall Fundamentals introduces readers to firewall concepts and explores various commercial and open source firewall implementations--including Cisco, Linksys, and Linux--allowing network administrators and small office/home office computer users to effectively choose and configure their devices. Firewall Fundamentals is written in clear and easy-to-understand language and helps novice users understand what firewalls are and how and where they are used. It introduces various types of firewalls, first conceptually and then by explaining how different firewall implementations actually work. It also provides numerous implementation examples, demonstrating the use of firewalls in both personal and business-related scenarios, and explains how a firewall should be installed and configured. Additionally, generic firewall troubleshooting methodologies and common management tasks are clearly defined and explained.show more

Product details

  • Paperback | 408 pages
  • 186 x 228 x 24mm | 680.4g
  • Pearson Education (US)
  • Cisco Press
  • Indianapolis, United States
  • English
  • 1587052210
  • 9781587052217
  • 1,893,960

About Wes Noonan

Wesley J Noonan (Houston, Texas) has been working in the computer industry for over 12 years, specializing in Windows-based networks and network infrastructure security design and implementation. He is a Staff Quality Engineer for NetIQ working on their security solutions product line. Ido Dubrawsky (Sliver Springs, MD) is a Senior Security Consultant with Callisma, an SBC subsidiary. He advises customers on a wide variety of security issues. Previously he was a Network Security Architect with Cisco Systems SAFE Architecture Teamshow more

Back cover copy

The essential guide to understanding and using firewalls to protect personal computers and your network An easy-to-read introduction to the most commonly deployed network security device Understand the threats firewalls are designed to protect against Learn basic firewall architectures, practical deployment scenarios, and common management and troubleshooting tasks Includes configuration, deployment, and management checklists Increasing reliance on the Internet in both work and home environments has radically increased the vulnerability of computing systems to attack from a wide variety of threats. Firewall technology continues to be the most prevalent form of protection against existing and new threats to computers and networks. A full understanding of what firewalls can do, how they can be deployed to maximum effect, and the differences among firewall types can make the difference between continued network integrity and complete network or computer failure. "Firewall Fundamentals" introduces readers to firewall concepts and explores various commercial and open source firewall implementations--including Cisco, Linksys, and Linux--allowing network administrators and small office/home office computer users to effectively choose and configure their devices. "Firewall Fundamentals" is written in clear and easy-to-understand language and helps novice users understand what firewalls are and how and where they are used. It introduces various types of firewalls, first conceptually and then by explaining how different firewall implementations actually work. It also provides numerous implementation examples, demonstrating the use of firewalls in both personal and business-related scenarios, and explains how a firewall should be installed and configured. Additionally, generic firewall troubleshooting methodologies and common management tasks are clearly defined and explained.show more

Table of contents

IntroductionPart 1 Introduction to Firewalls3Chapter 1 Introduction to FirewallsWhat Is a Firewall?What Can Firewalls Do? Firewalls Manage and Control Network Traffic Firewalls Authenticate Access Firewalls Act as an Intermediary Firewalls Protect Resources Firewalls Record and Report on EventsWhat Are the Threats? Targeted Versus Untargeted Attacks Viruses, Worms, and Trojans Malicious Content and Malware Denial of Service Zombies Compromise of Personal Information and Spyware Social Engineering New Attack Vectors Insecure/Poorly Designed ApplicationsWhat Are the Motives?Security Policies Examples of Security Policies Firewalls and TrustDetermining If You Need a FirewallSummaryChapter 2 Firewall BasicsFirewall Taxonomy Personal Firewalls Network FirewallsFirewall Products Software Firewalls Appliance Firewalls Integrated FirewallsFirewall Technologies Personal Firewalls Packet Filters NAT Firewalls Circuit-Level Firewalls Proxy Firewalls Stateful Firewalls Transparent Firewalls Virtual FirewallsOpen and Closed Source FirewallsSummaryChapter 3 TCP/IP for FirewallsProtocols, Services, and Applications The OSI Model The Department of Defense (DoD) Model How Firewalls Use Protocols, Applications, and ServicesInternet Protocol (IP) IP Packet Structure The IP Packet Header Bad IP PacketsTransmission Control Protocol (TCP) TCP Segment Structure TCP Segment Header Bad TCPUser Datagram Protocol (UDP) UDP Message Structure UDP Datagram Header Bad UDPInternet Control Message Protocol (ICMP) ICMP Message Structure Bad ICMPAddressing in IP Networks Physical Addresses Logical Addresses IP Addressing Subnets IPv6Network Address Translation (NAT)NAT Implementations NAT and IPsec: The Issues and the SolutionsBroadcast and MulticastIP ServicesIP Routing Types of Routing How the IP Routing Process Works Different Classes of Routing Protocols Common Routing ProtocolsApplications Using IP Common Applications Using IP Less-Common Applications Using IP Protocols Used to Implement SecuritySummaryPart II How Firewalls WorkChapter 4 Personal Firewalls: Windows Firewall and Trend Micro's PC-cillinWindows Firewall and Windows XP How Windows Firewall Works Configuring Windows Firewall Windows Firewall Features Windows Firewall ChecklistTrend Micro's PC-cillin Firewall Feature PC-cillin Requirements How the Trend Micro Firewall Works Configuring the Trend Micro Firewall Trend Micro Firewall Features Trend Micro Firewall ChecklistSummaryChapter 5 Broadband Routers and FirewallsHow Broadband Routers and Firewalls WorkLinksys Broadband Routers/Firewalls Security and Filtering Features Routing Features Management and Administration Features Miscellaneous FeaturesLinksys RequirementsHow the Linksys Router/Firewall Works Filtering Traffic from External Sources Filtering Traffic from Internal SourcesConfiguring Linksys Configuring Basic Setup Configuring Security Configuring Applications & Gaming Configuring AdministrationLinksys ChecklistSummaryChapter 6 Cisco PIX Firewall and ASA Security AppliancePIX/ASA FeaturesChoosing Between the PIX and the ASACisco PIX Firewall and ASA Models SOHO Solution Medium- to Large-Office Solution Enterprise Office and Service Provider SolutionHow the PIX/ASA Firewall Works Firewall Security Policy Firewall Modes of Operation Stateful InspectionConfiguring the Cisco PIX/ASA Assigning IP Addresses to the Firewall Interfaces Configuring the Firewall Name, Domain Name, and Passwords Configuring the Firewall Routing Settings Configuring the Firewall for Remote Management Access Configuring NAT Settings for Outbound Access Configuring the ACLs Configuring Logging on the FirewallPIX/ASA ChecklistSummaryChapter 7 Linux-Based FirewallsNetFilter FeaturesNetFilter RequirementsHow NetFilter WorksConfiguring NetFilter IPTables Command-Line Tool Firewall Builder Firestarter WebminNetFilter ChecklistSummaryChapter 8 Application Proxy FirewallsApplication Layer Filtering How Application Filtering Works The Difference Between Application Filtering and Deep Packet InspectionProxy Server FunctionalityLimitations of Application Proxy FirewallsMicrosoft ISA Server 2004 Firewall Microsoft ISA Server 2004 Features Microsoft ISA Server 2004 Requirements and Preparation How the Microsoft ISA Server 2004 Firewall Works Microsoft ISA Server 2004 ChecklistSummaryChapter 9 Where Firewalls Fit in a NetworkDifferent Types of Office Requirements Central Office Remote OfficeSingle-Firewall Architectures Internet Firewall with a Single DMZ Internet Firewall with Multiple DMZs Internet-Screening Firewall (No DMZ)Dual-Firewall ArchitectureThe Firewall System Single-Firewall System Dual-Firewall SystemWhere Personal/Desktop Firewalls Fit in a NetworkWhere Application Firewalls Fit in a NetworkFirewalls and VLANs Virtual FirewallsUsing Firewalls to Segment Internal Resources Protecting Sensitive Internal Resources Protecting from WAN or Remote-Access Requests Protecting Individual Internal Resources Be Realistic When Implementing Internal FirewallsHigh-Availability Firewall DesignsSummaryPart III Managing and Maintaining FirewallsChapter 10 Firewall Security PoliciesWritten Security Policies The Difference Between Policies, Standards, Guidelines, and Procedures Security Policy Format Common Security Policies Firewall Security PolicyFirewall Policies/Rulesets Ingress Filters Egress Filters Management-Access RulesetSummaryChapter 11 Managing FirewallsDefault PasswordsMaintaining the Underlying PlatformFirewall Management Interface Managing Firewalls with a CLI Managing Firewalls with a GUI Interface PreferenceManagement Access In-Band Management Out-of-Band Management Telnet vs. SSH HTTP vs. HTTPSCommon Firewall Management Tasks Initial Configuration Modifying the Configuration Updating the Firewall SoftwareSummaryChapter 12 What Is My Firewall Telling Me?Firewalls and Logging The Syslog Protocol Proprietary Logging Methods Why Logging Is ImportantFirewall Log Review and Analysis What to Look for in Firewall Logs Cisco Secure PIX Firewall Syslog Event BaselineFirewall Forensics The Value (or Not) of IP Addresses Deciphering Port Numbers Securing the FirewallSummaryChapter 13 Troubleshooting FirewallsDeveloping a Troubleshooting Checklist Step 1: Verify the Problem Reported Step 2: Test Connectivity Step 3: Physically Check the Firewall Step 4: Check for Recent Changes Step 5: Check the Firewall Logs for Errors Step 6: Verify the Firewall Configuration Step 7: Verify the Firewall Ruleset Step 8: Verify That Any Dependent, Non-Firewall-SpecificSystems Are Not the Culprit Step 9: Monitor the Network TrafficBasic Firewall Troubleshooting Troubleshooting Connectivity Through the Firewall Troubleshooting Connectivity to the FirewallAdvanced Firewall TroubleshootingTroubleshooting ExampleSummaryChapter 14 Going Beyond Basic Firewall FeaturesContent Filtering Implementing a URL Filter Maintaining URL Filters What to Do If. . .Performing Application Filtering Applications That Are Hard to FirewallIntrusion Detection and Prevention Overview of IDSVirtual Private Networks IPsec VPNs SSL VPNsSummaryEndnotesPart IV AppendixesAppendix A Firewall and Security ToolsAppendix B Firewall and Security Resources 1587052210TOC052206show more

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