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Troubleshooting Linux Firewalls
Troubleshooting Linux Firewalls
ISBN: 321227239
EAN: N/A
Year: 2004
Pages: 169
BUY ON AMAZON
Troubleshooting Linux Firewalls
Table of Contents
Copyright
SectionI.Getting Started
Chapter 1. Introduction
Why We Wrote This Book
How This Book Is Organized
Goals of This Book
The Methodical Approach and the Need for a Methodology
Firewalls, Security, and Risk Management
How to Think About Risk Management
Computer Security Principles
Firewall Recommendations and Definitions
Why Do I Need a Firewall?
Do I Need More Than a Firewall?
What Kinds of Firewalls Are There?
The Myth of Trustworthy or Secure Software
Know Your Vulnerabilities
Creating Security Policies
Training
Defense in Depth
Summary
Chapter 2. Getting Started
Risk Management
Basic Elements of Risk Management
Seven Steps to Managing Risk
Phase I: Analyze
Phase II: Document
Phase III: Secure the Enterprise
Phase IV: Implement Monitoring
Phase V: Test
Phase VI: Integrate
Phase VII: Improve
Summary
Chapter 3. Local Firewall Security
The Importance of Keeping Your Software Up to Date
Over Reliance on Patching
Turning Off Services
Security Tools to Install
Summary
Chapter 4. Troubleshooting Methodology
Problem Solving Methodology
Recognize, Define, and Isolate the Problem
Gather Facts
Define What the End State Should Be
Develop Possible Solutions and Create an Action Plan
Analyze and Compare Possible Solutions
Select and Implement the Solution
Critically Analyze the Solution for Effectiveness
Repeat the Process Until You Resolve the Problem
Summary
SectionII.Tools and Internals
Chapter 5. The OSI Model: Start from the Beginning
Internet Protocols at a Glance
Summary
Chapter 6. netfilter and iptables Overview
How netfilter Works
Summary
Chapter 7. Using iptables
Proper iptables Syntax
Setting Up an Example Firewall
ACCEPT Rules
Summary
Chapter 8. A Tour of Our Collective Toolbox
Old Faithful
Sniffers
Firewall Management and Rule Building
Summary
Chapter 9. Diagnostics
Diagnostic Logging
Checking the Network
Using a Sniffer to Diagnose Firewall Problems
Memory Load Diagnostics
Summary
SectionIII.Diagnostics
Chapter 10. Testing Your Firewall Rules (for Security)
Inside-Out Testing with nmap and iplog
Interpreting the Output from an Inside-Out Scan
Testing from the Outside-In
Reading Output from nmap
Testing your Firewall with fragrouter
VLANs
Summary
Chapter 11. Layer 2Inline Filtering
Common Questions
Tools Discussed in this Chapter
Building an Inline Transparent Bridging Firewall with ebtables (Stealth Firewalls)
Building an Inline Transparent Bridging Firewall with iptables (Stealth Firewalls)
MAC Address Filtering with iptables
DHCP Filtering with ebtables
Summary
Chapter 12. NAT (Network Address Translation) and IP Forwarding
Common Questions about Linux NAT
ToolsMethods Discussed in this Chapter
Summary
Chapter 13. General IP (Layer 3Layer 4)
Common Question
Inbound: Creating a Rule for a New TCP Service
Inbound: Allowing SSH to a Local System
Forward: SSH to Another System
SSH: Connections Timeout
Telnet: Forwarding Telnet Connections to Other Systems
MySQL: Allowing MySQL Connections
Summary
Chapter 14. SMTP (e-mail)
Common Questions
Tools Discussed in this Chapter
Allowing SMTP tofrom Your Firewalls
Forwarding SMTP to an Internal Mail Server
Forcing Your Mail Server Traffic to Use a Specific IP Address with an SNAT Rule
Blocking Internal Users from Sending Mail Through Your Firewall
Accept Only SMTP Connections from Specific Hosts (ISP)
SMTP Server TimeoutsFailuresNumerous Processes
Small E-Mail SendReceive CorrectlyLarge E-Mail Messages Do Not
Summary
Chapter 15. Web Services (Web Servers and Web Proxies)
Common Questions
Tools Discussed in this Chapter
Summary
Chapter 16. File Services (NFS and FTP)
Tools Discussed in this Chapter
Summary
Chapter 17. Instant Messaging
Common QuestionsProblems
Tools Discussed in This Chapter
NetMeeting and GnomeMeeting
MSN Messenger
Yahoo Messenger
AOL Instant Messenger (AIM)
ICQ
Summary
Chapter 18. DNSDHCP
Common Questions
Tools Discussed in this Chapter
Summary
Chapter 19. Virtual Private Networks
Things to Consider with IPSEC
Common QuestionsProblems
Tools Discussed in this Chapter
Running a PPTP Server Behind a NAT Firewall
Summary
Index
SYMBOL
A
B
C
D
E
F
G
H
I
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Troubleshooting Linux Firewalls
ISBN: 321227239
EAN: N/A
Year: 2004
Pages: 169
BUY ON AMAZON
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