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Network Scanning Cookbook

You're reading from   Network Scanning Cookbook Practical network security using Nmap and Nessus 7

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Product type Paperback
Published in Sep 2018
Publisher Packt
ISBN-13 9781789346480
Length 304 pages
Edition 1st Edition
Tools
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Author (1):
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Sairam Jetty Sairam Jetty
Author Profile Icon Sairam Jetty
Sairam Jetty
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Toc

Table of Contents (10) Chapters Close

Preface 1. Introduction to Network Vulnerability Scanning 2. Understanding Network Scanning Tools FREE CHAPTER 3. Port Scanning 4. Vulnerability Scanning 5. Configuration Audits 6. Report Analysis and Confirmation 7. Understanding the Customization and Optimization of Nessus and Nmap 8. Network Scanning for IoT, SCADA/ICS 9. Other Books You May Enjoy

How to detect operating system

Nmap uses TCP/IP stack fingerprinting for OS detection.This is done by crafting custom TCP and UDP packets and analyzing their responses. After generating various such probes and comparing the results to the Nmap-os-db database of more than 2,600 known OS fingerprints and provides the OS version. The fingerprint provides details such as the vendor name, OS name, OS generation, device type, and also their Common Platform Enumeration (CPE) representation. Nmap also provides an option for the user to submit the fingerprint obtained if it is not present in the Nmap database of operating signatures:

  • -O (Enable OS detection): This enables OS detection for an Nmap scan. This flag further has options that can be used in conjunction with it.
  • --osscan-limit: This option will reduce the scan time when a list of hosts is being scanned by skipping the hosts...
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