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Nmap Network Exploration and Security Auditing Cookbook, Third Edition

You're reading from   Nmap Network Exploration and Security Auditing Cookbook, Third Edition Network discovery and security scanning at your fingertips

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Product type Paperback
Published in Sep 2021
Publisher Packt
ISBN-13 9781838649357
Length 436 pages
Edition 3rd Edition
Languages
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Author (1):
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Paulino Calderon Paulino Calderon
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Paulino Calderon
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Table of Contents (22) Chapters Close

Preface 1. Chapter 1: Nmap Fundamentals 2. Chapter 2: Getting Familiar with Nmap's Family FREE CHAPTER 3. Chapter 3: Network Scanning 4. Chapter 4: Reconnaissance Tasks 5. Chapter 5: Scanning Web Servers 6. Chapter 6: Scanning Databases 7. Chapter 7: Scanning Mail Servers 8. Chapter 8: Scanning Windows Systems 9. Chapter 9: Scanning ICS/SCADA Systems 10. Chapter 10: Scanning Mainframes 11. Chapter 11: Optimizing Scans 12. Chapter 12: Generating Scan Reports 13. Chapter 13: Writing Your Own NSE Scripts 14. Chapter 14: Exploiting Vulnerabilities with the Nmap Scripting Engine 15. Other Books You May Enjoy Appendix A: HTTP, HTTP Pipelining, and Web Crawling Configuration Options 1. Appendix Β: Brute-Force Password Auditing Options 2. Appendix C: NSE Debugging 3. Appendix D: Additional Output Options 4. Appendix Ε: Introduction to Lua 5. Appendix F: References and Additional Reading

Skipping phases to speed up scans

Nmap scans are divided into phases. When we are working with many hosts, we can save time by skipping tests or phases that return the information we don't need or that we already have. By carefully selecting our scan timing and performance options, we can significantly improve the speed of our scans.

This recipe explains the process that takes place behind the curtains when scanning, the performance and timing configurations that can be adjusted, and how to skip certain phases to speed up scans.

How to do it...

  1. To perform a full port scan with the timing template set to aggressive (-T4), and without reverse DNS resolution (-n) or ping (-Pn), use the following command:
    # nmap -T4 -n -Pn -p- <target>
  2. Note the scanning time at the end of the report:
    Nmap scan report for 74.207.244.221 Host is up (0.11s latency).
    Not shown: 65532 closed ports PORT   STATE SERVICE
    22/tcp     open ssh 80...
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