Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By : Paulino Calderon
Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By: Paulino Calderon

Overview of this book

This is the second edition of ‘Nmap 6: Network Exploration and Security Auditing Cookbook’. A book aimed for anyone who wants to master Nmap and its scripting engine through practical tasks for system administrators and penetration testers. Besides introducing the most powerful features of Nmap and related tools, common security auditing tasks for local and remote networks, web applications, databases, mail servers, Microsoft Windows machines and even ICS SCADA systems are explained step by step with exact commands and argument explanations. The book starts with the basic usage of Nmap and related tools like Ncat, Ncrack, Ndiff and Zenmap. The Nmap Scripting Engine is thoroughly covered through security checks used commonly in real-life scenarios applied for different types of systems. New chapters for Microsoft Windows and ICS SCADA systems were added and every recipe was revised. This edition reflects the latest updates and hottest additions to the Nmap project to date. The book will also introduce you to Lua programming and NSE script development allowing you to extend further the power of Nmap.
Table of Contents (25 chapters)
Title Page
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
13
Brute Force Password Auditing Options
17
References and Additional Reading

Discovering hosts with UDP ping scans


Ping scans are used to determine if a host is responding and can be considered online. UDP ping scans have the advantage of being capable of detecting systems behind firewalls with strict TCP filtering but that left UDP exposed.

This next recipe describes how to perform a UDP ping scan with Nmap and its related options.

How to do it...

Open your terminal and enter the following command:

# nmap -sn -PU <target>

 

Nmap will determine if the target is reachable using a UDP ping scan:

# nmap -sn -PU scanme.nmap.org
   Nmap scan report for scanme.nmap.org (45.33.32.156) 
   Host is up (0.13s latency). 
   Other addresses for scanme.nmap.org (not scanned):     
   2600:3c01::f03c:91ff:fe18:bb2f 
   Nmap done: 1 IP address (1 host up) scanned in 7.92 seconds 

How it works...

The -sn option tells Nmap to skip the port scan phase but perform host discovery. In combination with the -PU flag, Nmap uses UDP ping scanning. The technique used by a UDP ping scan works...