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 TCP SYN ping scans


Ping scans are used for detecting live hosts in networks. Nmap's default ping scan (-sP) sends TCP SYN, TCP ACK, and ICMP packets to determine if a host is responding, but if a firewall is blocking these requests, it will be treated as offline. Fortunately, Nmap supports a scanning technique named the TCP SYN ping scan that is very handy to probe different ports in an attempt to determine if a host is online or at least has more permissive filtering rules.

This recipe will talk about the TCP SYN ping scan and its related options.

How to do it...

Open your terminal and enter the following command:

# nmap -sn -PS <target>

 

You should see the list of hosts found in the target range using TCP SYN ping scanning:

# nmap -sn -PS 192.1.1/24
   Nmap scan report for 192.168.0.1 
   Host is up (0.060s latency). 
   Nmap scan report for 192.168.0.2 
   Host is up (0.0059s latency). 
   Nmap scan report for 192.168.0.3 
   Host is up (0.063s latency). 
   Nmap...