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  • Book Overview & Buying NMAP Essentials
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NMAP Essentials

NMAP Essentials

By : Shaw
4 (1)
Buy this Book
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NMAP Essentials

NMAP Essentials

4 (1)
By: Shaw
Buy this Book

Overview of this book

This book is for beginners who wish to start using Nmap, who have experience as a system administrator or of network engineering, and who wish to get started with Nmap.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Introduction to Nmap
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1. Introduction to Nmap
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Nmap's humble beginnings
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The many uses of Nmap
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Installing Nmap
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Building Nmap from source
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Summary
2
2. Network Fundamentals
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2. Network Fundamentals
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The structure of the Internet
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The OSI model
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Port scanning
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TCP and UDP
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Service banners
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Summary
3
3. Nmap Basics
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3. Nmap Basics
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How to choose a target
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Running a default scan
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Service version scans
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Logging scans
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Specified scan ranges
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Understanding the reason flag
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Summary
4
4. Advanced Nmap Scans
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4. Advanced Nmap Scans
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Host detection methods
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Running a ping agnostic scan
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Scanning UDP services
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Special TCP scans
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Operating system detection
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Increasing verbosity in scans
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Packet tracing
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Summary
5
5. Performance Optimization
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5. Performance Optimization
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Nmap timing optimization
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Customized host group sizes
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Increasing and decreasing parallelism
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Dealing with stuck hosts
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Delaying and increasing probe rates
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Summary
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6. Introduction to the Nmap Scripting Engine
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6. Introduction to the Nmap Scripting Engine
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The history of the NSE
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The inner working of the NSE
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Finding Nmap scripts
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Running Nmap scripts
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Summary
7
7. Writing Nmap Scripts
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7. Writing Nmap Scripts
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Anatomy of an Nmap script
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Defining an Nmap script – script headers
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Triggering functions – the rule
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Defining a script's action
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Summary
8
8. Additional Nmap Tools
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8. Additional Nmap Tools
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Attacking services with Ncrack
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Host detection with Nping
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File transfers and backdoors with Ncat
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Comparing Nmap results with Ndiff
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Summary
9
9. Vulnerability Assessments and Tools
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9. Vulnerability Assessments and Tools
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Conducting vulnerability scans with Nessus
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Assessing web server issues with Nikto
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Identifying sensitive web directories with DirBuster
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Getting started with intercepting proxies
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Summary
10
10. Penetration Testing with Metasploit
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10. Penetration Testing with Metasploit
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Installing Metasploit
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Scanning with Metasploit
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Attacking services with Metasploit
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What to learn next
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Summary
11
Index
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Index

Chapter 5. Performance Optimization

We are now completely able to scan many different types of hosts, and overcome a plethora of methods that system administrators and network engineers use to defend or mask their machines. Excellent! At this juncture, we will begin to look at some of the broader strokes that Nmap can address: specifically, the difficulty we may encounter if we attempt to scan large swaths of IP addresses that may create performance disruptions.

Unfortunately, using advanced Nmap options, which we learned about in the last chapter, can make scans take significantly longer time than we may have. Performance optimization techniques are some of the least used but most useful Nmap flags, so it's worth it to learn them well—and to employ them when needed.

In this chapter, we will cover:

  • Basic Nmap timing optimization
  • Customized host group sizes
  • How to increase or decrease Nmap's parallelism
  • How to deal with stuck hosts
  • How to delay (or increase the rate of...
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Tech Concepts
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Programming languages
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