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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

2. Network Exploration FREE CHAPTER

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 TCP ACK ping scans

Similar to the TCP SYN ping scan, the TCP ACK ping scan is used to determine if a host is responding. It can be used to detect hosts that block SYN packets or ICMP echo requests, but it will most likely be blocked by modern firewalls that track connection states because it sends bogus TCP ACK packets associated with non-existing connections.

The following recipe shows how to perform a TCP ACK ping scan and its related options.

How to do it...

Open your terminal and enter the following command:

# nmap -sn -PA <target>

The result is a list of hosts that responded to the TCP ACK packets sent, therefore, online:

# nmap -sn -PA 192.168.0.1/24
   Nmap scan report for 192.168.0.1 
   Host is up (0.060s latency). 
   Nmap scan report for 192.168.0.60 
   Host is up (0.00014s latency). 
   Nmap done: 256 IP addresses (2 hosts up) scanned in 6.11 seconds

How it works...

The -sn option tells Nmap to skip the port scan phase and only perform host discovery. And...

You have been reading a chapter from

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

Published in: May 2017

Publisher:

ISBN-13: 9781786467454

© 2017 Packt Publishing Limited All Rights Reserved

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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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