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Nmap: Network Exploration and Security Auditing Cookbook

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

Product type Paperback

Published in May 2017

Publisher

ISBN-13 9781786467454

Length 416 pages

Edition 2nd Edition

Languages

Lua

Tools

Nmap

Concepts

Penetration Testing

Author (1):

Paulino Calderon

View More author details

Table of Contents (18) Chapters

Preface

1. Nmap Fundamentals FREE CHAPTER

2. Network Exploration

3. Reconnaissance Tasks

4. Scanning Web Servers

5. Scanning Databases

6. Scanning Mail Servers

7. Scanning Windows Systems

8. Scanning ICS SCADA Systems

9. Optimizing Scans

10. Generating Scan Reports

11. Writing Your Own NSE Scripts

12. HTTP, HTTP Pipelining, and Web Crawling Configuration Options

13. Brute Force Password Auditing Options

Brute modes

14. NSE Debugging

15. Additional Output Options

16. Introduction to Lua

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...

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Authors (1)

Paulino Calderon

Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.

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